Add m-esr52 at 52.6.0

37 files changed, 2707 insertions, 0 deletions

diff --git a/layout/inspector/tests/bug1202095-2.css b/layout/inspector/tests/bug1202095-2.css
new file mode 100644
index 000000000..a484814eb
--- /dev/null
+++ b/layout/inspector/tests/bug1202095-2.css
@@ -0,0 +1,7 @@
+/*
+ * Bug 1202095 - parseStyleSheet should not re-load @imports
+ */
+
+body {
+  color: chartreuse;
+}
diff --git a/layout/inspector/tests/bug1202095.css b/layout/inspector/tests/bug1202095.css
new file mode 100644
index 000000000..fa8ef0feb
--- /dev/null
+++ b/layout/inspector/tests/bug1202095.css
@@ -0,0 +1,7 @@
+/*
+ * Bug 1202095 - parseStyleSheet should not re-load @imports
+ */
+
+body {
+  background-color: purple;
+}
diff --git a/layout/inspector/tests/bug856317.css b/layout/inspector/tests/bug856317.css
new file mode 100644
index 000000000..49691e3eb
--- /dev/null
+++ b/layout/inspector/tests/bug856317.css
@@ -0,0 +1,23 @@
+/*
+ * Bug 856317 - expose the column number of style rules via inIDOMUtils
+ */
+
+/* simplest possible */
+.alpha {
+}
+
+/* with leading whitespace */
+    #beta {
+    }
+
+/* with a comment before the rule */ #gamma {
+}
+
+/* mixed spaces and tab characters */
+  	 #delta {
+}
+
+/* long lines, like those produced by CSS minifiers
+ * (overflows a 16-bit unsigned int)
+ */
+ .epsilon{ background-image: url("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx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diff --git a/layout/inspector/tests/chrome/GentiumPlus-R.woff b/layout/inspector/tests/chrome/GentiumPlus-R.woff
new file mode 100644
index 000000000..ebefd081a
--- /dev/null
+++ b/layout/inspector/tests/chrome/GentiumPlus-R.woff
diff --git a/layout/inspector/tests/chrome/chrome.ini b/layout/inspector/tests/chrome/chrome.ini
new file mode 100644
index 000000000..ef4b74bda
--- /dev/null
+++ b/layout/inspector/tests/chrome/chrome.ini
@@ -0,0 +1,12 @@
+[DEFAULT]
+skip-if = os == 'android'
+support-files = GentiumPlus-R.woff
+
+[test_bug467669.css]
+[test_bug467669.xul]
+[test_bug695639.css]
+[test_bug695639.xul]
+[test_bug708874.css]
+[test_bug708874.xul]
+[test_bug727834.css]
+[test_bug727834.xul]
diff --git a/layout/inspector/tests/chrome/test_bug467669.css b/layout/inspector/tests/chrome/test_bug467669.css
new file mode 100644
index 000000000..fb050bf31
--- /dev/null
+++ b/layout/inspector/tests/chrome/test_bug467669.css
@@ -0,0 +1,8 @@
+@font-face {
+  font-family: font-face-test-family;
+  src: url(bad/font/name.ttf), url(GentiumPlus-R.woff) format("woff");
+}
+
+.gentium {
+  font-family: font-face-test-family;
+}
diff --git a/layout/inspector/tests/chrome/test_bug467669.xul b/layout/inspector/tests/chrome/test_bug467669.xul
new file mode 100644
index 000000000..a5ecd32a7
--- /dev/null
+++ b/layout/inspector/tests/chrome/test_bug467669.xul
@@ -0,0 +1,174 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<?xml-stylesheet type="text/css" href="test_bug467669.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=467669
+-->
+<window title="Mozilla Bug 467669"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="RunTest();">
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+  <!-- test code goes here -->
+  <script type="application/javascript">
+  <![CDATA[
+  /** Test for Bug 467669 **/
+
+SimpleTest.waitForExplicitFinish();
+
+function RunTest() {
+  const CI = Components.interfaces;
+  const CC = Components.classes;
+
+  const kIsLinux = navigator.platform.indexOf("Linux") == 0;
+  const kIsMac = navigator.platform.indexOf("Mac") == 0;
+  const kIsWin = navigator.platform.indexOf("Win") == 0;
+
+  var domUtils =
+    CC["@mozilla.org/inspector/dom-utils;1"].getService(CI.inIDOMUtils);
+
+  var rng = document.createRange();
+  var elem, fonts, f;
+
+  elem = document.getElementById("test1");
+  rng.selectNode(elem);
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 1, "number of fonts for simple Latin text");
+  f = fonts.item(0);
+  is(f.rule, null, "rule");
+  is(f.srcIndex, -1, "srcIndex");
+  is(f.localName, "", "local name");
+  is(f.URI, "", "URI");
+  is(f.format, "", "format string");
+  is(f.metadata, "", "metadata");
+//  report(elem.id, fonts);
+
+  elem = document.getElementById("test2");
+  rng.selectNode(elem);
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 3, "number of fonts for mixed serif, sans and monospaced text");
+//  report(elem.id, fonts);
+
+  elem = document.getElementById("test3");
+  rng.selectNode(elem);
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 2, "number of fonts for mixed Latin & Chinese");
+//  report(elem.id, fonts);
+
+  // get properties of a @font-face font
+  elem = document.getElementById("test4");
+  rng.selectNode(elem);
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 1, "number of fonts in @font-face test");
+  f = fonts.item(0);
+  isnot(f.rule, null, "missing rule");
+  is(f.srcIndex, 1, "srcIndex");
+  is(f.localName, "", "local name");
+  is(f.URI, "chrome://mochitests/content/chrome/layout/inspector/tests/chrome/GentiumPlus-R.woff", "bad URI");
+  is(f.format, "woff", "format");
+  is(/bukva:raz/.test(f.metadata), true, "metadata");
+//  report(elem.id, fonts);
+
+  elem = document.getElementById("test5").childNodes[0];
+  // check that string length is as expected, including soft hyphens
+  is(elem.length, 42, "string length with soft hyphens");
+
+  // initial latin substring...
+  rng.setStart(elem, 0);
+  rng.setEnd(elem, 20); // "supercalifragilistic"
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 1, "number of fonts (Latin-only)");
+  f = fonts.item(0);
+  is(f.name, "Gentium Plus", "font name");
+  is(f.CSSFamilyName, "font-face-test-family", "family name");
+  is(f.fromFontGroup, true, "font matched in font group");
+
+  // extend to include a chinese character
+  rng.setEnd(elem, 21);
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 2, "number of fonts (incl Chinese)");
+  if (kIsMac || kIsWin) { // these are only implemented by the Mac & Win font backends
+    var i;
+    for (i = 0; i < fonts.length; ++i) {
+      f = fonts.item(i);
+      if (f.rule) {
+        is(f.fromFontGroup, true, "@font-face font matched in group");
+        is(f.fromLanguagePrefs, false, "not from language prefs");
+        is(f.fromSystemFallback, false, "not from system fallback");
+      } else {
+        is(f.fromFontGroup, false, "not matched in group");
+        is(f.fromLanguagePrefs, true, "from language prefs");
+        is(f.fromSystemFallback, false, "not from system fallback");
+      }
+    }
+  }
+
+  // second half of the string includes &shy; chars to check original/skipped mapping;
+  // select just the final character
+  rng.setStart(elem, elem.length - 1);
+  rng.setEnd(elem, elem.length);
+  is(rng.toString(), "!", "content of range");
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 1, "number of fonts for last char");
+  f = fonts.item(0);
+  is(f.name, "Gentium Plus", "font name");
+
+  // include the preceding character as well
+  rng.setStart(elem, elem.length - 2);
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 2, "number of fonts for last two chars");
+
+  // then trim the final one
+  rng.setEnd(elem, elem.length - 1);
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 1, "number of fonts for Chinese char");
+  f = fonts.item(0);
+  isnot(f.name, "Gentium Plus", "font name for Chinese char");
+
+  rng.selectNode(elem);
+  fonts = domUtils.getUsedFontFaces(rng);
+//  report("test5", fonts);
+
+  elem = document.getElementById("test6");
+  rng.selectNode(elem);
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 2, "number of font faces for regular & italic");
+  is(fonts.item(0).CSSFamilyName, fonts.item(1).CSSFamilyName, "same family for regular & italic");
+  isnot(fonts.item(0).name, fonts.item(1).name, "different faces for regular & italic");
+//  report(elem.id, fonts);
+
+  SimpleTest.finish();
+}
+
+// just for test-debugging purposes
+function report(e, f) {
+  var fontNames = "";
+  var i;
+  for (i = 0; i < f.length; ++i) {
+    if (i == 0) {
+      fontNames += e + " fonts: "
+    } else {
+      fontNames += ", ";
+    }
+    fontNames += f.item(i).name;
+  }
+  dump(fontNames + "\n");
+}
+
+  ]]>
+  </script>
+
+  <!-- html:body contains elements the test will inspect -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=467669"
+     target="_blank">Mozilla Bug 467669</a>
+  <div id="test1">Hello world</div>
+  <div id="test2" style="font-family:sans-serif"><span style="font-family:serif">Hello</span> <tt>cruel</tt> world</div>
+  <div id="test3">Hello, &#x4F60;&#x597D;</div>
+  <div id="test4" class="gentium">Hello Gentium Plus!</div>
+  <div id="test5" class="gentium">supercalifragilistic&#x4F60;ex&#xAD;pi&#xAD;a&#xAD;li&#xAD;do&#xAD;cious&#x597D;!</div>
+  <div id="test6" style="font-family:serif">regular and <em>italic</em> text</div>
+  </body>
+
+</window>
diff --git a/layout/inspector/tests/chrome/test_bug695639.css b/layout/inspector/tests/chrome/test_bug695639.css
new file mode 100644
index 000000000..549537498
--- /dev/null
+++ b/layout/inspector/tests/chrome/test_bug695639.css
@@ -0,0 +1,8 @@
+@font-face {
+  font-family: gent;
+  src: url(GentiumPlus-R.woff) format("woff");
+}
+
+.test {
+  font-family: gent, sans-serif;
+}
diff --git a/layout/inspector/tests/chrome/test_bug695639.xul b/layout/inspector/tests/chrome/test_bug695639.xul
new file mode 100644
index 000000000..cc2c879c9
--- /dev/null
+++ b/layout/inspector/tests/chrome/test_bug695639.xul
@@ -0,0 +1,80 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<?xml-stylesheet type="text/css" href="test_bug695639.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=695639
+-->
+<window title="Mozilla Bug 695639"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="RunTest();">
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <script type="application/javascript">
+  <![CDATA[
+  /** Test for Bug 695639 - check that GetFontFacesForText handles wrapped lines properly **/
+
+SimpleTest.waitForExplicitFinish();
+
+function RunTest() {
+  const CI = Components.interfaces;
+  const CC = Components.classes;
+
+  var domUtils =
+    CC["@mozilla.org/inspector/dom-utils;1"].getService(CI.inIDOMUtils);
+
+  var rng = document.createRange();
+  var elem, fonts, f;
+
+  elem = document.getElementById("test").childNodes[0];
+  rng.setStart(elem, 0);
+  rng.setEnd(elem, 14);
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 2, "number of fonts used for entire text");
+
+  // initial latin substring...
+  rng.setStart(elem, 0);
+  rng.setEnd(elem, 5); // "Hello"
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 1, "number of fonts (1)");
+  f = fonts.item(0);
+  is(f.name, "Gentium Plus", "font name (1)");
+
+  // the space (where the line wraps) should also be Gentium
+  rng.setStart(elem, 5);
+  rng.setEnd(elem, 6); // space
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 1, "number of fonts (2)");
+  f = fonts.item(0);
+  is(f.name, "Gentium Plus", "font name (2)");
+
+  // the Chinese text "ni hao" should NOT be in Gentium
+  rng.setStart(elem, 6);
+  rng.setEnd(elem, 8); // two Chinese characters on second line
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 1, "number of fonts (3)");
+  f = fonts.item(0);
+  isnot(f.name, "Gentium Plus", "font name (3)");
+
+  // space and "world" should be Gentium again
+  rng.setStart(elem, 8);
+  rng.setEnd(elem, 14);
+  fonts = domUtils.getUsedFontFaces(rng);
+  is(fonts.length, 1, "number of fonts (4)");
+  f = fonts.item(0);
+  is(f.name, "Gentium Plus", "font name (4)");
+
+  SimpleTest.finish();
+}
+  ]]>
+  </script>
+
+  <style type="text/css">
+  </style>
+
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=695639"
+     target="_blank">Mozilla Bug 695639</a>
+  <div style="width: 2em;" class="test" id="test">Hello &#x4F60;&#x597D; world</div>
+  </body>
+
+</window>
diff --git a/layout/inspector/tests/chrome/test_bug708874.css b/layout/inspector/tests/chrome/test_bug708874.css
new file mode 100644
index 000000000..539c44538
--- /dev/null
+++ b/layout/inspector/tests/chrome/test_bug708874.css
@@ -0,0 +1,33 @@
+#test-div {
+  color: rgb(0, 0, 0);
+  font-family: serif;
+  font-weight: 400;
+}
+
+#test-div:hover {
+  color: rgb(10, 0, 0);
+}
+
+#test-div:active {
+  font-family: Arial;
+}
+
+#test-div:focus {
+  font-weight: 800;
+}
+
+#test-button {
+  color: rgb(0, 0, 0);
+}
+
+#test-button:disabled {
+  color: rgb(40, 0, 0);
+}
+
+#test-link:visited {
+  color: rgb(20, 0, 0);
+}
+
+#test-link:link {
+  color: rgb(30, 0, 0);
+}
diff --git a/layout/inspector/tests/chrome/test_bug708874.xul b/layout/inspector/tests/chrome/test_bug708874.xul
new file mode 100644
index 000000000..0896d1eca
--- /dev/null
+++ b/layout/inspector/tests/chrome/test_bug708874.xul
@@ -0,0 +1,296 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<?xml-stylesheet type="text/css" href="test_bug708874.css"?>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=708874
+-->
+<window title="Mozilla Bug 708874"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="RunTests();">
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <script type="application/javascript">
+  <![CDATA[
+
+/** Test for Bug 708874 - API for locking pseudo-class state of an element **/
+
+var DOMUtils = Components.classes["@mozilla.org/inspector/dom-utils;1"]
+               .getService(Components.interfaces.inIDOMUtils);
+var DOMWindowUtils = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
+                     .getInterface(Components.interfaces.nsIDOMWindowUtils);
+
+var defaultColor = "rgb(0, 0, 0)";
+var disabledColor = "rgb(40, 0, 0)";
+
+function RunTests() {
+  testLockEnabled();
+  testLockDisabled();
+  testVisited();
+  testMultiple();
+  testInvalid();
+  testNotElement();
+}
+
+function testLockEnabled() {
+  var button = document.getElementById("test-button");
+
+  /* starting state is enabled */
+  button.removeAttribute("disabled");
+
+  is(DOMUtils.hasPseudoClassLock(button, ":disabled"), false,
+     "doesn't have lock at start");
+
+  is(window.getComputedStyle(button).color, defaultColor,
+     "color is default color before locking on");
+
+  is(button.matches(":disabled"), false,
+     "doesn't match selector at start");
+
+  /* lock */
+  DOMUtils.addPseudoClassLock(button, ":disabled");
+
+  is(DOMUtils.hasPseudoClassLock(button, ":disabled"), true,
+     "hasPseudoClassLock is true after locking");
+
+  is(window.getComputedStyle(button).color, disabledColor,
+     ":disabled style applied after adding lock");
+
+  is(button.matches(":disabled"), true,
+     "matches selector after adding lock");
+
+  /* change state to disabled */
+  button.setAttribute("disabled", "disabled");
+
+  is(window.getComputedStyle(button).color, disabledColor,
+     ":disabled style still applied after really disabling");
+
+  is(button.matches(":disabled"), true,
+    "matches selector after adding lock");
+
+  /* remove lock */
+  DOMUtils.removePseudoClassLock(button, ":disabled");
+
+  is(DOMUtils.hasPseudoClassLock(button, ":disabled"), false,
+     "hasPseudoClassLock is false after removing on lock");
+
+  is(window.getComputedStyle(button).color, disabledColor,
+     ":disabled style still applied after removing lock");
+
+  is(button.matches(":disabled"), true,
+     "matches selector after removing lock");
+
+  /* change state to enabled */
+  button.removeAttribute("disabled");
+
+  is(window.getComputedStyle(button).color, defaultColor,
+     "back to default style after un-disabling");
+
+  is(button.matches(":disabled"), false,
+    "doesn't match selector after enabling");
+}
+
+
+function testLockDisabled() {
+  var button = document.getElementById("test-button");
+
+  /* starting state is disabled */
+  button.setAttribute("disabled", "disabled");
+
+  is(DOMUtils.hasPseudoClassLock(button, ":disabled"), false,
+     "doesn't have lock at start");
+
+  is(window.getComputedStyle(button).color, disabledColor,
+     "color is :disabled color before locking");
+
+  is(button.matches(":disabled"), true,
+    "matches selector before locking");
+
+  /* lock */
+  DOMUtils.addPseudoClassLock(button, ":disabled");
+
+  is(DOMUtils.hasPseudoClassLock(button, ":disabled"), true,
+     "hasPseudoClassLock is true after locking");
+
+  is(window.getComputedStyle(button).color, disabledColor,
+     ":disabled style still applied after adding on lock");
+
+  is(button.matches(":disabled"), true,
+   "matches selector after locking");
+
+  /* change state to enabled */
+  button.removeAttribute("disabled");
+
+  is(window.getComputedStyle(button).color, disabledColor,
+     ":disabled style applied after enabling");
+
+  is(button.matches(":disabled"), true,
+   "matches selector after enabling with lock on");
+
+  /* remove lock */
+  DOMUtils.removePseudoClassLock(button, ":disabled");
+
+  is(DOMUtils.hasPseudoClassLock(button, ":disabled"), false,
+     "hasPseudoClassLock is false after removing on lock");
+
+  is(window.getComputedStyle(button).color, defaultColor,
+     "default style applied after removing lock");
+
+  is(button.matches(":disabled"), false,
+     "doesn't match selector after unlocking");
+
+  /* change state to disabled */
+  button.setAttribute("disabled", "disabled");
+
+  is(window.getComputedStyle(button).color, disabledColor,
+     ":disabled style applied after disabling after unlocking");
+
+  is(button.matches(":disabled"), true,
+    "matches selector again after disabling");
+}
+
+function testVisited() {
+  var link = document.getElementById("test-link");
+  var visitedColor = "rgb(20, 0, 0)";
+  var unvisitedColor = "rgb(30, 0, 0)";
+
+  /* lock visited */
+  DOMUtils.addPseudoClassLock(link, ":visited");
+
+  is(DOMUtils.hasPseudoClassLock(link, ":visited"), true,
+     "hasPseudoClassLock is true after adding lock");
+
+  var color = DOMWindowUtils.getVisitedDependentComputedStyle(link,
+                null, "color");
+  is(color, visitedColor, "color is :visited color after locking");
+
+  /* lock unvisited */
+  DOMUtils.addPseudoClassLock(link, ":link");
+
+  is(DOMUtils.hasPseudoClassLock(link, ":link"), true,
+     "hasPseudoClassLock is true after adding :link lock");
+
+  is(DOMUtils.hasPseudoClassLock(link, ":visited"), false,
+     "hasPseudoClassLock is false for :visited after adding :link lock");
+
+  var color = DOMWindowUtils.getVisitedDependentComputedStyle(link,
+                 null, "color");
+  is(color, unvisitedColor, "color is :link color after locking :link");
+
+  /* lock visited back on */
+  DOMUtils.addPseudoClassLock(link, ":visited");
+
+  is(DOMUtils.hasPseudoClassLock(link, ":visited"), true,
+    "hasPseudoClassLock is true after adding :visited lock");
+
+  is(DOMUtils.hasPseudoClassLock(link, ":link"), false,
+    "hasPseudoClassLock is false for :link after adding :visited lock");
+
+  var color = DOMWindowUtils.getVisitedDependentComputedStyle(link,
+               null, "color");
+  is(color, visitedColor, "color is :visited color after locking back on");
+}
+
+function testMultiple() {
+  var div = document.getElementById("test-div");
+
+  var styles = {
+    ":hover": {
+      property: "color",
+      value: "rgb(10, 0, 0)",
+      defaultValue: "rgb(0, 0, 0)"
+    },
+    ":active": {
+      property: "font-family",
+      value: "Arial",
+      defaultValue: "serif"
+    },
+    ":focus": {
+      property: "font-weight",
+      value: "800",
+      defaultValue: "400"
+    }
+  };
+
+  for (var pseudo in styles) {
+    DOMUtils.addPseudoClassLock(div, pseudo);
+  }
+
+  for (var pseudo in styles) {
+    is(DOMUtils.hasPseudoClassLock(div, pseudo), true,
+       "hasPseudoClassLock is true after locking");
+
+    var style = styles[pseudo];
+    is(window.getComputedStyle(div).getPropertyValue(style.property),
+       style.value, "style for pseudo-class is applied after locking");
+
+    is(div.matches(pseudo), true,
+       "matches selector after locking");
+  }
+
+  DOMUtils.clearPseudoClassLocks(div);
+
+  for (var pseudo in styles) {
+    is(DOMUtils.hasPseudoClassLock(div, pseudo), false,
+       "hasPseudoClassLock is false after clearing");
+
+    is(window.getComputedStyle(div).getPropertyValue(style.property),
+       style.defaultValue, "style is back to default after clearing");
+
+    is(div.matches(pseudo), false,
+      "doesn't match selector after unlocking");
+  }
+}
+
+function testInvalid() {
+  var div = document.getElementById("test-div");
+  var pseudos = ["not a valid pseudo-class", ":ny-link", ":first-child"];
+
+  for (var i = 0; i < pseudos.length; i++) {
+    var pseudo = pseudos[i];
+
+    // basically make sure these don't crash the browser.
+    DOMUtils.addPseudoClassLock(div, pseudo);
+
+    is(DOMUtils.hasPseudoClassLock(div, pseudo), false);
+
+    DOMUtils.removePseudoClassLock(div, pseudo);
+  }
+}
+
+function testNotElement() {
+  for (var value of [null, undefined, {}]) {
+    SimpleTest.doesThrow(() => DOMUtils.hasPseudoClassLock(value, ":hover"),
+                         "hasPseudoClassLock should throw for " + value);
+    SimpleTest.doesThrow(() => DOMUtils.addPseudoClassLock(value, ":hover"),
+                         "addPseudoClassLock should throw for " + value);
+    SimpleTest.doesThrow(() => DOMUtils.removePseudoClassLock(value, ":hover"),
+                         "removePseudoClassLock should throw for " + value);
+    SimpleTest.doesThrow(() => DOMUtils.clearPseudoClassLocks(value),
+                         "clearPseudoClassLocks should throw for " + value);
+  }
+}
+  ]]>
+  </script>
+
+  <body xmlns="http://www.w3.org/1999/xhtml">
+    <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=708874"
+       target="_blank">Mozilla Bug 708874</a>
+
+    <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=708874">
+      Mozilla Bug 708874 - API for locking pseudo-class state of an element
+    </a>
+
+    <a id="test-link" href="http://notavisitedwebsite.com">
+      test link
+    </a>
+
+    <div id="test-div">
+      test div
+    </div>
+
+    <button id="test-button">
+      test button
+    </button>
+  </body>
+
+</window>
diff --git a/layout/inspector/tests/chrome/test_bug727834.css b/layout/inspector/tests/chrome/test_bug727834.css
new file mode 100644
index 000000000..f21f7a54c
--- /dev/null
+++ b/layout/inspector/tests/chrome/test_bug727834.css
@@ -0,0 +1,7 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+body {
+  padding-top: 100px;
+}
diff --git a/layout/inspector/tests/chrome/test_bug727834.xul b/layout/inspector/tests/chrome/test_bug727834.xul
new file mode 100644
index 000000000..dde8e1b03
--- /dev/null
+++ b/layout/inspector/tests/chrome/test_bug727834.xul
@@ -0,0 +1,88 @@
+<?xml version="1.0"?>
+<!--
+vim: set ts=2 et sw=2 tw=80:
+Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<?xml-stylesheet type="text/css" href="test_bug727834.css"?>
+<window title="Mozilla Bug 727834"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="RunTests();">
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <script type="application/javascript"><![CDATA[
+/** Test for Bug 727834 - Add an API to (re)parse a style sheet in place **/
+
+function RunTests() {
+  SimpleTest.waitForExplicitFinish();
+
+  let DOMUtils = Components.classes["@mozilla.org/inspector/dom-utils;1"]
+                   .getService(Components.interfaces.inIDOMUtils);
+  let body = document.querySelector("body");
+  let testSheet = document.styleSheets[2];
+  let rule = document.styleSheets[2].cssRules[0];
+
+  is(testSheet.cssRules.length, 1,
+     "style sheet has 1 rule");
+  is(rule.style.paddingTop, "100px",
+     "original first rule has padding-top 100px");
+  is(window.getComputedStyle(body).paddingTop, "100px",
+     "original first rule applies");
+
+  DOMUtils.parseStyleSheet(testSheet,
+    "@import url(test_bug727834.css); body{background: red;}");
+
+  is(testSheet.cssRules.length, 2,
+     "style sheet now has 2 rules");
+  is(window.getComputedStyle(body).backgroundColor, "rgb(255, 0, 0)",
+     "background is now red");
+
+  let exceptionName;
+  try {
+    rule.style.paddingLeft = "100px";
+  } catch (ex) {
+    exceptionName = ex.name;
+  } finally {
+    is(exceptionName, "NS_ERROR_NOT_AVAILABLE",
+       "original rule is not available for modification anymore");
+  }
+  is(window.getComputedStyle(body).paddingLeft, "0px",
+     "original rule does not apply to document");
+
+  rule = testSheet.cssRules[0];
+
+  is(rule.parentStyleSheet, testSheet,
+     "rule's parent style sheet is not null");
+
+  DOMUtils.parseStyleSheet(testSheet,
+    "body{background: lime;}");
+
+  is(testSheet.cssRules.length, 1,
+     "style sheet now has 1 rule");
+  is(window.getComputedStyle(body).backgroundColor, "rgb(0, 255, 0)",
+     "background is now lime");
+  is(rule.parentStyleSheet, null,
+     "detached rule's parent style sheet is null");
+
+  SimpleTest.executeSoon(function () {
+    DOMUtils.parseStyleSheet(testSheet,
+      "@import url(test_bug727834.css); body{background: blue;}");
+
+    is(testSheet.cssRules.length, 2,
+       "style sheet now has 2 rules");
+    is(window.getComputedStyle(body).backgroundColor, "rgb(0, 0, 255)",
+       "background is now blue");
+    is(testSheet.cssRules[0].parentStyleSheet, testSheet,
+       "parent style sheet is the test sheet");
+
+    SimpleTest.finish();
+  });
+}
+  ]]></script>
+  <body xmlns="http://www.w3.org/1999/xhtml">
+    <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=727834">
+      Mozilla Bug 727834 - Add an API to (re)parse a style sheet in place
+    </a>
+  </body>
+</window>
diff --git a/layout/inspector/tests/file_bug522601.html b/layout/inspector/tests/file_bug522601.html
new file mode 100644
index 000000000..c3e27a4b5
--- /dev/null
+++ b/layout/inspector/tests/file_bug522601.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
+                      "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=522601
+-->
+<head>
+  <title>Test for Bug 522601</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<div id="some content">
+  <h1>Blah</h1>
+</div>
+</body>
+</html>
diff --git a/layout/inspector/tests/mochitest.ini b/layout/inspector/tests/mochitest.ini
new file mode 100644
index 000000000..25209f57a
--- /dev/null
+++ b/layout/inspector/tests/mochitest.ini
@@ -0,0 +1,29 @@
+[DEFAULT]
+support-files = 
+  bug1202095.css
+  bug1202095-2.css
+  bug856317.css
+  file_bug522601.html
+
+[test_bug462787.html]
+[test_bug462789.html]
+[test_bug522601.xhtml]
+[test_bug536379.html]
+[test_bug536379-2.html]
+[test_bug557726.html]
+[test_bug609549.xhtml]
+[test_bug806192.html]
+[test_bug856317.html]
+[test_bug877690.html]
+[test_bug1006595.html]
+[test_color_to_rgba.html]
+[test_css_property_is_shorthand.html]
+[test_css_property_is_valid.html]
+[test_getCSSPseudoElementNames.html]
+[test_getRelativeRuleLine.html]
+[test_get_all_style_sheets.html]
+[test_is_valid_css_color.html]
+[test_isinheritableproperty.html]
+[test_parseStyleSheet.html]
+[test_parseStyleSheetImport.html]
+[test_selectormatcheselement.html]
diff --git a/layout/inspector/tests/test_bug1006595.html b/layout/inspector/tests/test_bug1006595.html
new file mode 100644
index 000000000..009269d37
--- /dev/null
+++ b/layout/inspector/tests/test_bug1006595.html
@@ -0,0 +1,118 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1006595
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1006595</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  /** Test for Bug 1006595 **/
+  function arraysEqual(arr1, arr2, message) {
+    is(arr1.length, arr2.length, message + " length");
+    for (var i = 0; i < arr1.length; ++i) {
+      is(arr1[i], arr2[i], message + " element at index " + i);
+    }
+  }
+  var utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+    .getService(SpecialPowers.Ci.inIDOMUtils);
+
+  var paddingSubProps = utils.getSubpropertiesForCSSProperty("padding");
+  arraysEqual(paddingSubProps,
+              [ "padding-top",
+                "padding-right",
+                "padding-bottom",
+                "padding-left" ],
+              "'padding' subproperties");
+
+  var displaySubProps = utils.getSubpropertiesForCSSProperty("color");
+  arraysEqual(displaySubProps, [ "color" ],
+              "'color' subproperties");
+
+  var varProps = utils.getSubpropertiesForCSSProperty("--foo");
+  arraysEqual(varProps, ["--foo"], "'--foo' subproperties");
+
+  ok(utils.cssPropertyIsShorthand("padding"), "'padding' is a shorthand")
+  ok(!utils.cssPropertyIsShorthand("color"), "'color' is not a shorthand")
+
+  ok(utils.cssPropertySupportsType("padding", utils.TYPE_LENGTH),
+     "'padding' can be a length");
+  ok(!utils.cssPropertySupportsType("padding", utils.TYPE_COLOR),
+     "'padding' can't be a color");
+
+  ok(utils.cssPropertySupportsType("padding", utils.TYPE_PERCENTAGE),
+     "'padding' can be a percentage");
+  ok(!utils.cssPropertySupportsType("color", utils.TYPE_PERCENTAGE),
+     "'color' can't be a percentage");
+
+  ok(utils.cssPropertySupportsType("color", utils.TYPE_COLOR),
+     "'color' can be a color");
+  ok(utils.cssPropertySupportsType("background", utils.TYPE_COLOR),
+     "'background' can be a color");
+  ok(!utils.cssPropertySupportsType("background-image", utils.TYPE_COLOR),
+     "'background-image' can't be a color");
+
+  ok(utils.cssPropertySupportsType("background-image", utils.TYPE_URL),
+     "'background-image' can be a URL");
+  ok(utils.cssPropertySupportsType("background", utils.TYPE_URL),
+     "'background' can be a URL");
+  ok(!utils.cssPropertySupportsType("background-color", utils.TYPE_URL),
+     "'background-color' can't be a URL");
+
+  // There are no properties claiming to be of TYPE_ANGLE.  image-orientation
+  // would be, but it doesn't use table-driven parsing.
+
+  // There are no properties claiming to be of TYPE_FREQUENCY
+
+  ok(utils.cssPropertySupportsType("transition", utils.TYPE_TIME),
+     "'transition' can be a time");
+  ok(utils.cssPropertySupportsType("transition-duration", utils.TYPE_TIME),
+     "'transition-duration' can be a time");
+  ok(!utils.cssPropertySupportsType("background-color", utils.TYPE_TIME),
+     "'background-color' can't be a time");
+
+  ok(utils.cssPropertySupportsType("background-image", utils.TYPE_GRADIENT),
+     "'background-image' can be a gradient");
+  ok(utils.cssPropertySupportsType("background", utils.TYPE_GRADIENT),
+     "'background' can be a gradient");
+  ok(!utils.cssPropertySupportsType("background-color", utils.TYPE_GRADIENT),
+     "'background-color' can't be a gradient");
+
+  ok(utils.cssPropertySupportsType("transition", utils.TYPE_TIMING_FUNCTION),
+     "'transition' can be a timing function");
+  ok(utils.cssPropertySupportsType("transition-timing-function",
+                                   utils.TYPE_TIMING_FUNCTION),
+     "'transition-duration' can be a timing function");
+  ok(!utils.cssPropertySupportsType("background-color",
+                                    utils.TYPE_TIMING_FUNCTION),
+     "'background-color' can't be a timing function");
+
+  ok(utils.cssPropertySupportsType("background-image", utils.TYPE_IMAGE_RECT),
+     "'background-image' can be an image rect");
+  ok(utils.cssPropertySupportsType("background", utils.TYPE_IMAGE_RECT),
+     "'background' can be an image rect");
+  ok(!utils.cssPropertySupportsType("background-color", utils.TYPE_IMAGE_RECT),
+     "'background-color' can't be an image rect");
+
+  ok(utils.cssPropertySupportsType("z-index", utils.TYPE_NUMBER),
+     "'z-index' can be a number");
+  ok(utils.cssPropertySupportsType("line-height", utils.TYPE_NUMBER),
+     "'line-height' can be a number");
+  ok(!utils.cssPropertySupportsType("background-color", utils.TYPE_NUMBER),
+     "'background-color' can't be a number");
+
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1006595">Mozilla Bug 1006595</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_bug462787.html b/layout/inspector/tests/test_bug462787.html
new file mode 100644
index 000000000..88c5c466f
--- /dev/null
+++ b/layout/inspector/tests/test_bug462787.html
@@ -0,0 +1,100 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=462787
+-->
+<head>
+  <title>Test for Bug 462787</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=462787">Mozilla Bug 462787</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 462787 **/
+
+function do_test() {
+  const INVALID_POINTER = SpecialPowers.Cr.NS_ERROR_INVALID_POINTER;
+
+  var utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+                             .getService(SpecialPowers.Ci.inIDOMUtils);
+  try {
+    utils.getCSSStyleRules(null); 
+    ok(false, "expected an exception"); 
+  }
+  catch(e) {
+    e = SpecialPowers.wrap(e);
+    is(e.result, INVALID_POINTER, "got the expected exception");
+  }
+
+  try {
+    utils.getRuleLine(null); 
+    ok(false, "expected an exception"); 
+  }
+  catch(e) {
+    e = SpecialPowers.wrap(e);
+    is(e.result, INVALID_POINTER, "got the expected exception");
+  }
+
+  try {
+    utils.isIgnorableWhitespace(null);
+    ok(false, "expected an exception");
+  }
+  catch(e) {
+    e = SpecialPowers.wrap(e);
+    is(e.result, INVALID_POINTER, "got the expected exception");
+  }
+
+  try {
+    utils.getParentForNode(null, true); 
+    ok(false, "expected an exception");
+  }
+  catch(e) {
+    e = SpecialPowers.wrap(e);
+    is(e.result, INVALID_POINTER, "got the expected exception");
+  }
+
+  try {
+    utils.getBindingURLs(null); 
+    ok(false, "expected an exception"); 
+  }
+  catch(e) {
+    e = SpecialPowers.wrap(e);
+    is(e.result, INVALID_POINTER, "got the expected exception");
+  }
+
+  try {
+    utils.getContentState(null); 
+    ok(false, "expected an exception"); 
+  }
+  catch(e) {
+    e = SpecialPowers.wrap(e);
+    is(e.result, INVALID_POINTER, "got the expected exception");
+  }
+
+  try {
+    utils.setContentState(null, false); 
+    ok(false, "expected an exception"); 
+  }
+  catch(e) {
+    e = SpecialPowers.wrap(e);
+    is(e.result, INVALID_POINTER, "got the expected exception");
+  }
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(do_test);
+
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_bug462789.html b/layout/inspector/tests/test_bug462789.html
new file mode 100644
index 000000000..a027b85a6
--- /dev/null
+++ b/layout/inspector/tests/test_bug462789.html
@@ -0,0 +1,94 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=462789
+-->
+<head>
+  <title>Test for Bug 462789</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=462789">Mozilla Bug 462789</a>
+<p id="display"><iframe id="bug462789_iframe" src="data:text/html,<html><head><style>*{color:black;}</style></head><body>xxx" style="display: none;"></iframe></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 462789 **/
+
+function do_test() {
+  const ERROR_INVALID_ARG = 0x80070057;
+  const DOCUMENT_NODE_TYPE = 9;
+
+  var utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+                             .getService(SpecialPowers.Ci.inIDOMUtils);
+
+  var iframe = document.getElementById("bug462789_iframe");
+  var docElement = iframe.contentDocument.documentElement;
+  var body = docElement.children[1];
+  var rule = iframe.contentDocument.styleSheets[0].cssRules[0];
+  var text = body.firstChild;
+
+  try {
+    var res = utils.getCSSStyleRules(docElement);
+    is(res, null, "getCSSStyleRules");
+    res = utils.getCSSStyleRules(body);
+    is(res, null, "getCSSStyleRules");
+  }
+  catch(e) { ok(false, "got an unexpected exception:" + e); }
+
+  try {
+    var res = utils.getRuleLine(rule);
+    is(res, 1, "getRuleLine");
+  }
+  catch(e) { ok(false, "got an unexpected exception:" + e); }
+
+  try {
+    var res = utils.isIgnorableWhitespace(text);
+    is(res, false, "isIgnorableWhitespace");
+  }
+  catch(e) { ok(false, "got an unexpected exception:" + e); }
+
+  try {
+    var res = utils.getParentForNode(docElement, true);
+    is(res.nodeType, DOCUMENT_NODE_TYPE, "getParentForNode(docElement, true)");
+    res = utils.getParentForNode(text, true);
+    is(res.tagName, "BODY", "getParentForNode(text, true)");
+  }
+  catch(e) { ok(false, "got an unexpected exception:" + e); }
+
+  try {
+    var res = utils.getBindingURLs(docElement);
+    ok(SpecialPowers.call_Instanceof(res, SpecialPowers.Ci["nsIArray"]), "getBindingURLs result type");
+    is(res.length, 0, "getBindingURLs array length");
+  }
+  catch(e) { ok(false, "got an unexpected exception:" + e); }
+
+  try {
+    utils.getContentState(docElement);
+    ok(true, "Should not throw"); 
+  }
+  catch(e) { ok(false, "Got an exception: " + e); }
+
+  try {
+    utils.setContentState(docElement, false);
+    ok(false, "expected an exception"); 
+  }
+  catch(e) {
+    e = SpecialPowers.wrap(e);
+    is(e.result, ERROR_INVALID_ARG, "got the expected exception");
+  }
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(do_test);
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_bug522601.xhtml b/layout/inspector/tests/test_bug522601.xhtml
new file mode 100644
index 000000000..7c5a9e79c
--- /dev/null
+++ b/layout/inspector/tests/test_bug522601.xhtml
@@ -0,0 +1,274 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=522601
+-->
+<head>
+  <title>Test for Bug 522601</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="testBinding">
+      <content><div><children/></div><children includes="span"/></content>
+    </binding>
+  </bindings>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=522601">Mozilla Bug 522601</a>
+<p id="display" style="-moz-binding: url(#testBinding)">
+  <span id="s">This is some text</span>
+  More text
+  <b id="b">Even more <i id="i1">Italic</i>text<i id="i2">And more italic</i></b></p>
+<div id="content" style="display: none">
+  
+</div>
+<div id="subdoc">
+  <iframe id="frame1" src="file_bug522601.html">frame text</iframe>
+</div>
+<div id="test-shadow">
+  <h2 id="h2">light child</h2>
+</div>
+<pre id="test">
+<script type="application/javascript">
+<![CDATA[
+
+/** Test for Bug 522601 **/
+SimpleTest.waitForExplicitFinish();
+
+function testFunc(walker, func, expectedNode, str) {
+  var oldCurrent = SpecialPowers.unwrap(walker.currentNode);
+  var newNode = SpecialPowers.unwrap(walker[func]());
+  is(newNode, expectedNode, "Unexpected node after " + str);
+  is(SpecialPowers.unwrap(walker.currentNode), newNode ? newNode : oldCurrent,
+     "Unexpected current node after " + str);
+}
+
+addLoadEvent(function() {
+ var walkerSubDocument =
+    SpecialPowers.Cc["@mozilla.org/inspector/deep-tree-walker;1"]
+              .createInstance(SpecialPowers.Ci.inIDeepTreeWalker);
+  walkerSubDocument.showAnonymousContent = false;
+  walkerSubDocument.showSubDocuments = true;
+  walkerSubDocument.init($("frame1"), NodeFilter.SHOW_ALL);
+
+  is(SpecialPowers.unwrap(walkerSubDocument.currentNode), $("frame1"), "Unexpected sub-doc root");
+  testFunc(walkerSubDocument, "firstChild", $("frame1").contentDocument.doctype,
+           "step to sub documents doctype");
+  testFunc(walkerSubDocument, "nextSibling", $("frame1").contentDocument.documentElement,
+           "step to sub documents documentElement");
+
+  walkerSubDocument =
+    SpecialPowers.Cc["@mozilla.org/inspector/deep-tree-walker;1"]
+              .createInstance(SpecialPowers.Ci.inIDeepTreeWalker);
+  walkerSubDocument.showAnonymousContent = false;
+  walkerSubDocument.showSubDocuments = true;
+  walkerSubDocument.showDocumentsAsNodes = true;
+  walkerSubDocument.init($("frame1"), NodeFilter.SHOW_ALL);
+
+  is(SpecialPowers.unwrap(walkerSubDocument.currentNode), $("frame1"), "Unexpected sub-doc root");
+  testFunc(walkerSubDocument, "firstChild", $("frame1").contentDocument,
+           "step to sub document");
+  testFunc(walkerSubDocument, "firstChild", $("frame1").contentDocument.doctype,
+           "step to sub documents doctype");
+  testFunc(walkerSubDocument, "nextSibling", $("frame1").contentDocument.documentElement,
+           "step to sub documents documentElement");
+
+  walkerSubDocument.currentNode = $("frame1").contentDocument;
+  is(SpecialPowers.unwrap(walkerSubDocument.currentNode), $("frame1").contentDocument,
+     "setting currentNode to sub document");
+  testFunc(walkerSubDocument, "nextSibling", null,
+           "nextSibling for sub document is null");
+
+  var walkerFrameChild =
+    SpecialPowers.Cc["@mozilla.org/inspector/deep-tree-walker;1"]
+              .createInstance(SpecialPowers.Ci.inIDeepTreeWalker);
+  walkerFrameChild.showAnonymousContent = false;
+  walkerFrameChild.showSubDocuments = false;
+  walkerFrameChild.init($("frame1"), NodeFilter.SHOW_ALL);
+
+  is(SpecialPowers.unwrap(walkerFrameChild.currentNode), $("frame1"), "Unexpected sub-doc root");
+  testFunc(walkerFrameChild, "firstChild", $("frame1").firstChild,
+           "step to frames child");
+
+  var walkerNonAnon =
+    SpecialPowers.Cc["@mozilla.org/inspector/deep-tree-walker;1"]
+              .createInstance(SpecialPowers.Ci.inIDeepTreeWalker);
+  walkerNonAnon.init($("display"), NodeFilter.SHOW_ALL);
+  walkerNonAnon.showAnonymousContent = false;
+
+  is(SpecialPowers.unwrap(walkerNonAnon.currentNode), $("display"), "Unexpected non-anon root");
+  testFunc(walkerNonAnon, "nextNode", $("s").previousSibling,
+           "step to some text");
+  testFunc(walkerNonAnon, "nextNode", $("s"), "step to span");
+  testFunc(walkerNonAnon, "nextNode", $("s").firstChild, "step to span text");
+  testFunc(walkerNonAnon, "nextNode", $("s").nextSibling, "step to more text");
+  testFunc(walkerNonAnon, "nextNode", $("b"), "step to bold");
+  testFunc(walkerNonAnon, "nextNode", $("b").firstChild, "step to bold text");
+  testFunc(walkerNonAnon, "nextNode", $("i1"), "step to first italic");
+  testFunc(walkerNonAnon, "nextNode", $("i1").firstChild,
+           "step to first italic text");
+  testFunc(walkerNonAnon, "nextNode", $("i1").nextSibling,
+           "step to more bold text");
+  testFunc(walkerNonAnon, "nextNode", $("i2"), "step to second italic");
+  testFunc(walkerNonAnon, "nextNode", $("i2").firstChild,
+           "step to second italic text");
+  testFunc(walkerNonAnon, "nextNode", null, "step past end");
+  testFunc(walkerNonAnon, "parentNode", $("i2"), "step up to second italic");
+  testFunc(walkerNonAnon, "parentNode", $("b"), "step up to bold");
+  testFunc(walkerNonAnon, "nextNode", $("b").firstChild, "step to bold text again");
+  testFunc(walkerNonAnon, "parentNode", $("b"), "step up to bold again");
+  testFunc(walkerNonAnon, "parentNode", $("display"), "step up to display");
+  testFunc(walkerNonAnon, "parentNode", null, "step up past root");
+  testFunc(walkerNonAnon, "firstChild", $("s").previousSibling,
+           "step firstChild to display first child");
+  testFunc(walkerNonAnon, "nextSibling", $("s"),
+           "step nextSibling to span");
+  testFunc(walkerNonAnon, "nextSibling", $("s").nextSibling,
+           "step nextSibling to more text");
+  testFunc(walkerNonAnon, "nextSibling", $("b"), "step nextSibling to bold");
+  testFunc(walkerNonAnon, "nextSibling", null, "step nextSibling past end");
+  testFunc(walkerNonAnon, "previousSibling", $("s").nextSibling,
+           "step previousSibling to more text");
+  testFunc(walkerNonAnon, "previousSibling", $("s"),
+           "step previousSibling to span");
+  testFunc(walkerNonAnon, "previousSibling", $("s").previousSibling,
+           "step previousSibling to display first child");
+  testFunc(walkerNonAnon, "previousSibling", null,
+           "step previousSibling past end");
+
+  // Move the walker over to the end
+  while (walkerNonAnon.nextNode()) { /* do nothing */ }
+  is(SpecialPowers.unwrap(walkerNonAnon.currentNode), $("i2").firstChild, "unexpected last node");
+  testFunc(walkerNonAnon, "previousNode", $("i2"), "step back to second italic");
+  testFunc(walkerNonAnon, "previousNode", $("i1").nextSibling,
+           "step back to more bold text");
+  testFunc(walkerNonAnon, "previousNode", $("i1").firstChild,
+           "step back to first italic text");
+  testFunc(walkerNonAnon, "previousNode", $("i1"), "step back to first italic");
+  testFunc(walkerNonAnon, "previousNode", $("b").firstChild,
+           "step back to bold text");
+  testFunc(walkerNonAnon, "previousNode", $("b"), "step back to bold");
+  testFunc(walkerNonAnon, "previousNode", $("s").nextSibling, "step back to more text");
+  testFunc(walkerNonAnon, "previousNode", $("s").firstChild, "step back to span text");
+  testFunc(walkerNonAnon, "previousNode", $("s"), "step back to span");
+  testFunc(walkerNonAnon, "previousNode", $("s").previousSibling,
+           "step back to some text");
+  testFunc(walkerNonAnon, "previousNode", $("display"),
+           "step back to root");
+  testFunc(walkerNonAnon, "previousNode", null,
+           "step back past root");
+
+  walkerNonAnon.currentNode =  $("s");
+  is(SpecialPowers.unwrap(walkerNonAnon.currentNode), SpecialPowers.unwrap($("s")), 
+     "Setting currentNode to span");
+
+  var anonDiv = SpecialPowers.unwrap(SpecialPowers.wrap(document).getAnonymousNodes($("display")))[0];
+
+  try {
+    walkerNonAnon.currentNode = anonDiv;
+    ok(false, "Setting current node to a node that is otherwise unreachable," +
+              " with the current visibility settings should throw");
+  } catch(e) {
+    ok(e.toString().indexOf("NS_ERROR_ILLEGAL_VALUE") > -1, "Setting current node to an anon node should throw" +
+       " NS_ERROR_ILLEGAL_VALUE if showAnonymousContent is set to false");
+    is(SpecialPowers.unwrap(walkerNonAnon.currentNode), SpecialPowers.unwrap($("s")), 
+       "An unsuccessfull set currentNode should leave behind the old state");
+    testFunc(walkerNonAnon, "nextSibling", $("s").nextSibling, "nextSibling after set currentNode");
+  }
+
+  var walkerAnon =
+    SpecialPowers.Cc["@mozilla.org/inspector/deep-tree-walker;1"]
+              .createInstance(SpecialPowers.Ci.inIDeepTreeWalker);
+  walkerAnon.showAnonymousContent = true;
+  walkerAnon.init($("display"), NodeFilter.SHOW_ALL);
+
+  is(SpecialPowers.unwrap(walkerAnon.currentNode), $("display"), "Unexpected anon root");
+  testFunc(walkerAnon, "nextNode", anonDiv,
+           "step to anonymous div");
+  testFunc(walkerAnon, "nextNode", $("s").previousSibling,
+           "step to some text (anon)");
+  testFunc(walkerAnon, "nextNode", $("s").nextSibling, "step to more text (anon)");
+  testFunc(walkerAnon, "nextNode", $("b"), "step to bold (anon)");
+  testFunc(walkerAnon, "nextNode", $("b").firstChild, "step to bold text (anon)");
+  testFunc(walkerAnon, "nextNode", $("i1"), "step to first italic (anon)");
+  testFunc(walkerAnon, "nextNode", $("i1").firstChild,
+           "step to first italic text (anon)");
+  testFunc(walkerAnon, "nextNode", $("i1").nextSibling,
+           "step to more bold text (anon)");
+  testFunc(walkerAnon, "nextNode", $("i2"), "step to second italic (anon)");
+  testFunc(walkerAnon, "nextNode", $("i2").firstChild,
+           "step to second italic text (anon)");
+  testFunc(walkerAnon, "nextNode", $("s"), "step to span (anon)");
+  testFunc(walkerAnon, "nextNode", $("s").firstChild, "step to span text (anon)");
+  testFunc(walkerAnon, "nextNode", null, "step past end (anon)");
+  testFunc(walkerAnon, "parentNode", $("s"), "step up to span (anon)");
+  testFunc(walkerAnon, "parentNode", $("display"), "step up to display (anon)");
+  testFunc(walkerAnon, "nextNode", anonDiv, "step to anonymous div again");
+  testFunc(walkerAnon, "parentNode", $("display"),
+           "step up to display again (anon)");
+  testFunc(walkerAnon, "parentNode", null, "step up past root (anon)");
+  testFunc(walkerAnon, "firstChild", anonDiv,
+           "step firstChild to display first child (anon)");
+  testFunc(walkerAnon, "nextSibling", $("s"),
+           "step nextSibling to span (anon)");
+  testFunc(walkerAnon, "nextSibling", null, "step nextSibling past end (anon)");
+  testFunc(walkerAnon, "previousSibling", anonDiv,
+           "step previousSibling to anonymous div");
+  testFunc(walkerAnon, "previousSibling", null, "step previousSibling past end (anon)");
+
+  // Move the walker over to the end
+  while (walkerAnon.nextNode()) { /* do nothing */ }
+  testFunc(walkerAnon, "previousNode", $("s"), "step back to span (anon)");
+  testFunc(walkerAnon, "previousNode", $("i2").firstChild,
+           "step back to second italic text (anon)");
+  testFunc(walkerAnon, "previousNode", $("i2"), "step back to second italic (anon)");
+  testFunc(walkerAnon, "previousNode", $("i1").nextSibling,
+           "step back to more bold text (anon)");
+  testFunc(walkerAnon, "previousNode", $("i1").firstChild,
+           "step back to first italic text (anon)");
+  testFunc(walkerAnon, "previousNode", $("i1"), "step back to first italic (anon)");
+  testFunc(walkerAnon, "previousNode", $("b").firstChild, "step back to bold text (anon)");
+  testFunc(walkerAnon, "previousNode", $("b"), "step back to bold (anon)");
+  testFunc(walkerAnon, "previousNode", $("s").nextSibling, "step back to more text (anon)");
+  testFunc(walkerAnon, "previousNode", $("s").previousSibling,
+           "step back to some text (anon)");
+  testFunc(walkerAnon, "previousNode", anonDiv,
+           "step back to anonymous div");
+  testFunc(walkerAnon, "previousNode", $("display"), "step back to root (anon)");
+  testFunc(walkerAnon, "previousNode", null, "step back past root (anon)");
+
+  var shadowdiv = document.querySelector('#test-shadow');
+  var shadowRoot = shadowdiv.createShadowRoot();
+  var h = document.createElement("header");
+  var c = document.createElement("content");
+  c.setAttribute("select", "h2");
+  h.appendChild(c);
+  shadowRoot.appendChild(h);
+
+  var walkerShadow =
+    SpecialPowers.Cc["@mozilla.org/inspector/deep-tree-walker;1"]
+                 .createInstance(SpecialPowers.Ci.inIDeepTreeWalker);
+  walkerShadow.showAnonymousContent = true;
+  walkerShadow.init($("test-shadow"), NodeFilter.SHOW_ALL);
+  var c1 = walkerShadow.nextNode();
+  var c2 = walkerShadow.nextNode();
+  var c3 = walkerShadow.nextNode();
+
+  walkerShadow.currentNode = c1;
+  is(SpecialPowers.unwrap(walkerShadow.currentNode), h,
+     "Unexpected shadow element 1");
+  walkerShadow.currentNode = c2;
+  is(SpecialPowers.unwrap(walkerShadow.currentNode), $("h2"),
+     "Unexpected shadow element 2");
+  walkerShadow.currentNode = c3;
+  is(SpecialPowers.unwrap(walkerShadow.currentNode), $("h2").firstChild,
+     "Unexpected shadow element 3");
+
+  SimpleTest.finish();
+});
+
+]]>
+</script>
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_bug536379-2.html b/layout/inspector/tests/test_bug536379-2.html
new file mode 100644
index 000000000..6fe3d8f8d
--- /dev/null
+++ b/layout/inspector/tests/test_bug536379-2.html
@@ -0,0 +1,35 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=536379
+-->
+<head>
+  <title>Test for Bug 536379</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <link rel="stylesheet" type="text/css" href="data:text/css,@import 'data:text/css,p { color: green }'">
+  <link rel="stylesheet" type="text/css" href="data:text/css,@import &quot;data:text/css,@import 'data:text/css,p { color: green }'&quot;">
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=536379">Mozilla Bug 536379</a>
+<p id="display"></p>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 536379 **/
+
+const CI = SpecialPowers.Ci;
+const CC = SpecialPowers.Cc;
+
+var domUtils =
+  CC["@mozilla.org/inspector/dom-utils;1"].getService(CI.inIDOMUtils);
+var rules = domUtils.getCSSStyleRules(document.getElementById("display"));
+var firstPRule =
+  rules.GetElementAt(rules.Count() - 2).QueryInterface(CI.nsIDOMCSSStyleRule);
+firstPRule.style.removeProperty("color");
+ok(true, "should not crash");
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_bug536379.html b/layout/inspector/tests/test_bug536379.html
new file mode 100644
index 000000000..8ac012953
--- /dev/null
+++ b/layout/inspector/tests/test_bug536379.html
@@ -0,0 +1,46 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=536379
+-->
+<head>
+  <title>Test for Bug 536379</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <link rel="stylesheet" type="text/css" href="data:text/css,p { color: green }">
+  <link rel="stylesheet" type="text/css" href="data:text/css,p { color: green }">
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=536379">Mozilla Bug 536379</a>
+<p id="display"></p>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 536379 **/
+
+const CI = SpecialPowers.Ci;
+const CC = SpecialPowers.Cc;
+
+var domUtils =
+  CC["@mozilla.org/inspector/dom-utils;1"].getService(CI.inIDOMUtils);
+var rules = domUtils.getCSSStyleRules(document.getElementById("display"));
+var firstPRule =
+  rules.GetElementAt(rules.Count() - 2).QueryInterface(CI.nsIDOMCSSStyleRule);
+firstPRule.style.removeProperty("color");
+ok(true, "should not crash");
+
+var links = document.getElementsByTagName("link");
+is(links.length, 3, "links.length");
+is(SpecialPowers.unwrap(firstPRule.parentStyleSheet), links[1].sheet, "sheet match for first P rule");
+var secondPRule =
+  rules.GetElementAt(rules.Count() - 1).QueryInterface(CI.nsIDOMCSSStyleRule);
+is(SpecialPowers.unwrap(secondPRule.parentStyleSheet), links[2].sheet, "sheet match for second P rule");
+is(links[1].href, links[2].href, "links should have same href");
+isnot(links[1].sheet, links[2].sheet, "links should have different sheets");
+isnot(firstPRule, secondPRule, "rules should be different");
+isnot(firstPRule.cssText, secondPRule.cssText, "text should be different since property was removed from one");
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_bug557726.html b/layout/inspector/tests/test_bug557726.html
new file mode 100644
index 000000000..eda46bdfd
--- /dev/null
+++ b/layout/inspector/tests/test_bug557726.html
@@ -0,0 +1,95 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=557726
+-->
+<head>
+  <title>Test for Bug 557726</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <style id="pseudo-style">
+    #div1 {
+      color: blue;
+    }
+
+    #div1:first-letter {
+      font-weight: bold;
+    }
+
+    #div1:before {
+      content: '"';
+    }
+
+    #div1:after {
+      content: '"';
+    }
+
+    #div1:after, #div1:before {
+      color: red;
+    }
+  </style>
+</head>
+<body>
+
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=557726">Mozilla Bug 557726</a>
+
+<div id="div1">
+  text with ::before, ::after, and ::first-letter pseudo-elements
+</div>
+
+<script type="application/javascript">
+
+/** Test for Bug 557726 **/
+
+function getSelectors (rules) {
+  var styleElement = document.getElementById("pseudo-style");
+  var selectors = [];
+  for (var i = 0; i < rules.Count(); i++) {
+    var rule = rules.GetElementAt(i).QueryInterface(SpecialPowers.Ci.nsIDOMCSSStyleRule);
+    if (SpecialPowers.unwrap(rule.parentStyleSheet.ownerNode) == styleElement) // no user agent rules
+      selectors.push(rule.selectorText);
+  }
+  return selectors;
+}
+
+var domUtils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+               .getService(SpecialPowers.Ci.inIDOMUtils);
+
+var div = document.getElementById("div1");
+
+/* empty or missing pseudo-element argument */
+var selectors = getSelectors(domUtils.getCSSStyleRules(div));
+is(selectors.length, 1, "psuedo-element argument should be optional");
+is(selectors[0], "#div1", "should only have the non-pseudo element rule");
+
+selectors = getSelectors(domUtils.getCSSStyleRules(div, null));
+is(selectors.length, 1, "pseudo-element argument can be null");
+is(selectors[0], "#div1", "should only have the non pseudo-element rule");
+
+selectors = getSelectors(domUtils.getCSSStyleRules(div, ""));
+is(selectors.length, 1, "pseudo-element argument can be empty string");
+is(selectors[0], "#div1", "should only have the non pseudo-element rule");
+
+
+/* invalid pseudo-element argument */
+var rules = domUtils.getCSSStyleRules(div, "not a valid pseudo element");
+is(rules, null, "invalid pseudo-element returns no rules list");
+
+
+/* valid pseudo-element argument */
+selectors = getSelectors(domUtils.getCSSStyleRules(div, ":first-letter"));
+is(selectors.length, 1, "pseudo-element argument can be used");
+is(selectors[0], "#div1::first-letter", "should only have the ::first-letter rule");
+
+selectors = getSelectors(domUtils.getCSSStyleRules(div, ":before"));
+is(selectors.length, 2, "::before pseudo-element has two matching rules");
+isnot(selectors.indexOf("#div1::after, #div1::before"), -1, "fetched rule for ::before")
+isnot(selectors.indexOf("#div1::before"), -1, "fetched rule for ::before")
+
+selectors = getSelectors(domUtils.getCSSStyleRules(div, ":first-line"));
+is(selectors.length, 0, "valid pseudo-element but no matching rules");
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_bug609549.xhtml b/layout/inspector/tests/test_bug609549.xhtml
new file mode 100644
index 000000000..d7d115847
--- /dev/null
+++ b/layout/inspector/tests/test_bug609549.xhtml
@@ -0,0 +1,67 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=609549
+-->
+<head>
+  <title>Test for Bug 609549</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+
+  <bindings xmlns="http://www.mozilla.org/xbl">
+    <binding id="testBinding">
+      <!-- No linebreaks since this is html and whitespace is preserved. -->
+      <content><div anonid="box-A">x</div><div anonid="box-B"><children includes="span"/></div><div anonid="box-C">x</div><children/></content>
+    </binding>
+  </bindings>
+</head>
+
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=609549">Mozilla Bug 609549</a>
+<div id="bound" style="-moz-binding: url(#testBinding);"><p id="p">lorem ipsum dolor sit amet</p><span id="sandwiched">sandwiched</span></div>
+
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+<![CDATA[
+
+/** Test for Bug 609549 **/
+SimpleTest.waitForExplicitFinish();
+
+addLoadEvent(function() {
+  var domUtils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"].
+                   getService(SpecialPowers.Ci.inIDOMUtils);
+  ok("getChildrenForNode" in domUtils, "domUtils has no getChildrenForNode");
+  var withoutAnons = SpecialPowers.unwrap(domUtils.getChildrenForNode($("bound"), false));
+
+  is(withoutAnons.length, $("bound").childNodes.length,
+     "withoutAnons should be the same length as childNodes");
+  is(withoutAnons[0], $("p"), "didn't get paragraph - without anons");
+  is(withoutAnons[1], $("sandwiched"),
+     "didn't get sandwiched span - without anons");
+
+  var withAnons = domUtils.getChildrenForNode($("bound"), true);
+
+  is(withAnons.length, 4, "bad withAnons.length");
+  is(withAnons[0].getAttribute("anonid"), "box-A",
+     "didn't get anonymous box-A");
+  is(withAnons[1].getAttribute("anonid"), "box-B",
+     "didn't get anonymous box-B");
+  is(withAnons[2].getAttribute("anonid"), "box-C",
+     "didn't get anonymous box-C");
+  is(withAnons[3].id, "p", "didn't get paragraph - with anons");
+
+  var bKids = domUtils.getChildrenForNode(withAnons[1], true);
+  is(bKids.length, 1, "bKids.length is bad");
+  is(SpecialPowers.unwrap(bKids[0]), $("sandwiched"),
+     "didn't get sandwiched span inserted into box-B");
+
+  SimpleTest.finish();
+});
+
+]]>
+</script>
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_bug806192.html b/layout/inspector/tests/test_bug806192.html
new file mode 100644
index 000000000..2a19ab633
--- /dev/null
+++ b/layout/inspector/tests/test_bug806192.html
@@ -0,0 +1,26 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=806192
+-->
+<head>
+  <title>Test for Bug 806192</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+
+const utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+.getService(SpecialPowers.Ci.inIDOMUtils);
+
+try {
+    var res = utils.getBindingURLs({});
+    ok(false, "didn't get error");
+}
+catch(e) { ok(true, "got expected exception"); }
+</script>
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_bug856317.html b/layout/inspector/tests/test_bug856317.html
new file mode 100644
index 000000000..b07b6ec1d
--- /dev/null
+++ b/layout/inspector/tests/test_bug856317.html
@@ -0,0 +1,84 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=856317
+-->
+<head>
+  <title>Test for Bug 856317</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <link rel="stylesheet" type="text/css" href="bug856317.css"/>
+  <style type="text/css" title="bug856317-inline">
+/* simplest possible */
+.alpha {
+}
+
+/* with leading whitespace */
+    #beta {
+    }
+
+/* with a comment before the rule */ #gamma {
+}
+
+/* mixed spaces and tab characters */
+  	 #delta {
+}
+
+/* long lines, like those produced by CSS minifiers
+ * (overflows a 16-bit unsigned int)
+ */
+ .epsilon{ background-image: url("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx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+  </style>
+</head>
+<body>
+<script type="application/javascript">
+
+var expectedResults = {
+  ".alpha":      { line:  6, column:  1 },
+  "#beta":       { line: 10, column:  5 },
+  "#gamma":      { line: 13, column: 38 },
+  "#delta":      { line: 17, column:  5 },
+  ".epsilon":    { line: 23, column:  2 },
+  ".zeta, .eta": { line: 23, column: 65578 }
+};
+
+var domUtils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+               .getService(SpecialPowers.Ci.inIDOMUtils);
+
+// tests are run on both the external stylesheet and the embedded stylesheet
+function executeTests(lineOffset, stylesheetPredicate) {
+  var rules;
+  for (var i=0; i < document.styleSheets.length; ++i) {
+    var styleSheet = document.styleSheets.item(i);
+    if (stylesheetPredicate(styleSheet)) {
+      rules = styleSheet.cssRules;
+      break;
+    }
+  }
+  if (!rules) {
+    ok(false, "stylesheet document not found");
+    return;
+  }
+
+  for (var i=0; i < rules.length; ++i) {
+    var rule = rules.item(i);
+    expected = expectedResults[rule.selectorText];
+    is(domUtils.getRuleLine(rule), expected.line + lineOffset,
+       "line number for "+rule.selectorText);
+    is(domUtils.getRuleColumn(rule), expected.column,
+       "column number for "+rule.selectorText);
+  }
+}
+
+// run tests on external stylesheet
+executeTests(0, function (styleSheet) {
+  return styleSheet.href.indexOf("bug856317.css") > 0;
+});
+
+// run tests on embedded stylesheet
+executeTests(7, function (styleSheet) {
+  return styleSheet.title == "bug856317-inline";
+});
+</script>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_bug877690.html b/layout/inspector/tests/test_bug877690.html
new file mode 100644
index 000000000..0480656d4
--- /dev/null
+++ b/layout/inspector/tests/test_bug877690.html
@@ -0,0 +1,260 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=877690
+-->
+<head>
+<meta charset="utf-8">
+<title>Test for Bug 877690</title>
+<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+<script type="application/javascript">
+
+/** Test for Bug 877690 **/
+
+// Returns true if array contains item. False otherwise. Raises an exception if
+// array is not an Array object. If the item is found in array, remove item.
+function contains(array, item) {
+  if (!array.indexOf) {
+    throw new "First argument is not an array";
+  }
+  var index = array.indexOf(item);
+  if (index == -1) {
+    return false;
+  }
+  array.splice(index, 1);
+  return true;
+}
+
+// Returns true if values contains all and only the expected values. False otherwise.
+function testValues(values, expected) {
+  expected.forEach(function (expectedValue) {
+      if (!contains(values, expectedValue)) {
+        return false;
+      }
+  });
+  return values.length === 0;
+}
+
+function do_test() {
+  var utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+    .getService(SpecialPowers.Ci.inIDOMUtils);
+
+  var getCSSValuesForProperty = function(prop) {
+    return Array.from(utils.getCSSValuesForProperty(prop));
+  }
+
+  // test a property with keywords and colors
+  var prop = "color";
+  var values = getCSSValuesForProperty(prop);
+  var expected = [ "initial", "inherit", "unset", "aliceblue", "antiquewhite", "aqua", "aquamarine", "azure",
+      "beige", "bisque", "black", "blanchedalmond", "blue", "blueviolet", "brown", "burlywood",
+      "cadetblue", "chartreuse", "chocolate", "coral", "cornflowerblue", "cornsilk", "crimson", "currentColor",
+      "cyan", "darkblue", "darkcyan", "darkgoldenrod", "darkgray", "darkgreen", "darkgrey",
+      "darkkhaki", "darkmagenta", "darkolivegreen", "darkorange", "darkorchid", "darkred",
+      "darksalmon", "darkseagreen", "darkslateblue", "darkslategray", "darkslategrey",
+      "darkturquoise", "darkviolet", "deeppink", "deepskyblue", "dimgray", "dimgrey", "dodgerblue",
+      "firebrick", "floralwhite", "forestgreen", "fuchsia", "gainsboro", "ghostwhite", "gold",
+      "goldenrod", "gray", "grey", "green", "greenyellow", "honeydew", "hotpink", "indianred",
+      "indigo", "ivory", "khaki", "lavender", "lavenderblush", "lawngreen", "lemonchiffon", "lightblue",
+      "lightcoral", "lightcyan", "lightgoldenrodyellow", "lightgray", "lightgreen", "lightgrey",
+      "lightpink", "lightsalmon", "lightseagreen", "lightskyblue", "lightslategray", "lightslategrey",
+      "lightsteelblue", "lightyellow", "lime", "limegreen", "linen", "magenta", "maroon", "mediumaquamarine",
+      "mediumblue", "mediumorchid", "mediumpurple", "mediumseagreen", "mediumslateblue", "mediumspringgreen",
+      "mediumturquoise", "mediumvioletred", "midnightblue", "mintcream", "mistyrose", "moccasin", "navajowhite",
+      "navy", "oldlace", "olive", "olivedrab", "orange", "orangered", "orchid", "palegoldenrod", "palegreen",
+      "paleturquoise", "palevioletred", "papayawhip", "peachpuff", "peru", "pink", "plum", "powderblue",
+      "purple", "rebeccapurple", "red", "rosybrown", "royalblue", "saddlebrown", "salmon", "sandybrown", "seagreen",
+      "seashell", "sienna", "silver", "skyblue", "slateblue", "slategray", "slategrey", "snow", "springgreen",
+      "steelblue", "tan", "teal", "thistle", "tomato", "transparent", "turquoise", "violet", "wheat",
+      "white", "whitesmoke", "yellow", "yellowgreen", "rgb", "hsl", "rgba", "hsla" ];
+  ok(testValues(values, expected), "property color's values.");
+
+  // test a shorthand property
+  var prop = "background";
+  var values = getCSSValuesForProperty(prop);
+  var expected = [ "initial", "inherit", "unset", "aliceblue", "antiquewhite", "aqua", "aquamarine", "azure",
+      "beige", "bisque", "black", "blanchedalmond", "blue", "blueviolet", "brown", "burlywood", "cadetblue",
+      "chartreuse", "chocolate", "coral", "cornflowerblue", "cornsilk", "crimson", "currentColor", "cyan", "darkblue",
+      "darkcyan", "darkgoldenrod", "darkgray", "darkgreen", "darkgrey", "darkkhaki", "darkmagenta",
+      "darkolivegreen", "darkorange", "darkorchid", "darkred", "darksalmon", "darkseagreen", "darkslateblue",
+      "darkslategray", "darkslategrey", "darkturquoise", "darkviolet", "deeppink", "deepskyblue", "dimgray",
+      "dimgrey", "dodgerblue", "firebrick", "floralwhite", "forestgreen", "fuchsia", "gainsboro", "ghostwhite",
+      "gold", "goldenrod", "gray", "grey", "green", "greenyellow", "honeydew", "hotpink", "indianred",
+      "indigo", "ivory", "khaki", "lavender", "lavenderblush", "lawngreen", "lemonchiffon", "lightblue",
+      "lightcoral", "lightcyan", "lightgoldenrodyellow", "lightgray", "lightgreen", "lightgrey", "lightpink",
+      "lightsalmon", "lightseagreen", "lightskyblue", "lightslategray", "lightslategrey", "lightsteelblue",
+      "lightyellow", "lime", "limegreen", "linen", "magenta", "maroon", "mediumaquamarine", "mediumblue",
+      "mediumorchid", "mediumpurple", "mediumseagreen", "mediumslateblue", "mediumspringgreen",
+      "mediumturquoise", "mediumvioletred", "midnightblue", "mintcream", "mistyrose", "moccasin",
+      "navajowhite", "navy", "oldlace", "olive", "olivedrab", "orange", "orangered", "orchid", "palegoldenrod",
+      "palegreen", "paleturquoise", "palevioletred", "papayawhip", "peachpuff", "peru", "pink", "plum",
+      "powderblue", "purple", "rebeccapurple", "red", "rosybrown", "royalblue", "saddlebrown", "salmon", "sandybrown",
+      "seagreen", "seashell", "sienna", "silver", "skyblue", "slateblue", "slategray", "slategrey",
+      "snow", "springgreen", "steelblue", "tan", "teal", "thistle", "tomato", "transparent", "turquoise",
+      "violet", "wheat", "white", "whitesmoke", "yellow", "yellowgreen", "no-repeat", "repeat",
+      "repeat-x", "repeat-y", "space", "round", "fixed", "scroll", "local", "center", "top", "bottom", "left", "right",
+      "border-box", "padding-box", "content-box", "border-box", "padding-box", "content-box", "text", "contain",
+      "cover", "rgb", "hsl", "rgba", "hsla", "none", "-moz-element", "-moz-image-rect", "url", "linear-gradient",
+      "radial-gradient", "repeating-linear-gradient", "repeating-radial-gradient", "-moz-linear-gradient",
+      "-moz-radial-gradient", "-moz-repeating-linear-gradient", "-moz-repeating-radial-gradient" ];
+  ok(testValues(values, expected), "Shorthand property values.");
+
+  var prop = "border";
+  var values = getCSSValuesForProperty(prop);
+  var expected = [ "-moz-calc", "initial", "unset", "aliceblue",
+      "antiquewhite", "aqua", "aquamarine", "azure", "beige", "bisque", "black", "blanchedalmond", "blue", "blueviolet",
+      "brown", "burlywood", "cadetblue", "calc", "chartreuse", "chocolate", "coral", "cornflowerblue", "cornsilk",
+      "crimson", "currentColor", "cyan", "darkblue", "darkcyan", "darkgoldenrod", "darkgray", "darkgreen", "darkgrey", "darkkhaki",
+      "darkmagenta", "darkolivegreen", "darkorange", "darkorchid", "darkred", "darksalmon", "darkseagreen",
+      "darkslateblue", "darkslategray", "darkslategrey", "darkturquoise", "darkviolet", "dashed", "deeppink",
+      "deepskyblue", "dimgray", "dimgrey", "dodgerblue", "dotted", "double", "fill", "firebrick", "floralwhite",
+      "forestgreen", "fuchsia", "gainsboro", "ghostwhite", "gold", "goldenrod", "gray", "grey", "green", "greenyellow",
+      "groove", "hidden", "honeydew", "hotpink", "hsl", "hsla", "indianred", "indigo", "inherit", "inset", "ivory",
+      "khaki", "lavender", "lavenderblush", "lawngreen", "lemonchiffon", "lightblue", "lightcoral", "lightcyan",
+      "lightgoldenrodyellow", "lightgray", "lightgreen", "lightgrey", "lightpink", "lightsalmon", "lightseagreen",
+      "lightskyblue", "lightslategray", "lightslategrey", "lightsteelblue", "lightyellow", "lime", "limegreen",
+      "linen", "logical", "magenta", "maroon", "medium", "mediumaquamarine", "mediumblue", "mediumorchid",
+      "mediumpurple", "mediumseagreen", "mediumslateblue", "mediumspringgreen", "mediumturquoise",
+      "mediumvioletred", "midnightblue", "mintcream", "mistyrose", "moccasin", "navajowhite", "navy", "none",
+      "oldlace", "olive", "olivedrab", "orange", "orangered", "orchid", "outset", "palegoldenrod", "palegreen",
+      "paleturquoise", "palevioletred", "papayawhip", "peachpuff", "peru", "physical", "pink", "plum", "powderblue",
+      "purple", "rebeccapurple", "red", "repeat", "rgb", "rgba", "ridge", "rosybrown", "round", "royalblue", "saddlebrown",
+      "salmon", "sandybrown", "seagreen", "seashell", "sienna", "silver", "skyblue", "slateblue", "slategray", "slategrey",
+      "snow", "solid", "space", "springgreen", "steelblue", "stretch", "tan", "teal", "thick", "thin", "thistle", "tomato",
+      "transparent", "turquoise", "-moz-element", "-moz-image-rect", "url", "violet", "wheat", "white", "whitesmoke",
+      "yellow", "yellowgreen", "linear-gradient", "radial-gradient", "repeating-linear-gradient",
+      "repeating-radial-gradient", "-moz-linear-gradient", "-moz-radial-gradient", "-moz-repeating-linear-gradient",
+      "-moz-repeating-radial-gradient" ]
+  ok(testValues(values, expected), "Shorthand property values.");
+
+  // test keywords only
+  var prop = "border-top";
+  var values = getCSSValuesForProperty(prop);
+  var expected = [ "initial", "inherit", "unset", "thin", "medium", "thick", "none", "hidden", "dotted",
+      "dashed", "solid", "double", "groove", "ridge", "inset", "outset",
+      "aliceblue", "antiquewhite", "aqua", "aquamarine", "azure", "beige", "bisque", "black",
+      "blanchedalmond", "blue", "blueviolet", "brown", "burlywood", "cadetblue", "chartreuse",
+      "chocolate", "coral", "cornflowerblue", "cornsilk", "crimson", "currentColor", "cyan", "darkblue", "darkcyan",
+      "darkgoldenrod", "darkgray", "darkgreen", "darkgrey", "darkkhaki", "darkmagenta", "darkolivegreen",
+      "darkorange", "darkorchid", "darkred", "darksalmon", "darkseagreen", "darkslateblue", "darkslategray",
+      "darkslategrey", "darkturquoise", "darkviolet", "deeppink", "deepskyblue", "dimgray", "dimgrey",
+      "dodgerblue", "firebrick", "floralwhite", "forestgreen", "fuchsia", "gainsboro", "ghostwhite",
+      "gold", "goldenrod", "gray", "grey", "green", "greenyellow", "honeydew", "hotpink", "indianred",
+      "indigo", "ivory", "khaki", "lavender", "lavenderblush", "lawngreen", "lemonchiffon", "lightblue",
+      "lightcoral", "lightcyan", "lightgoldenrodyellow", "lightgray", "lightgreen", "lightgrey",
+      "lightpink", "lightsalmon", "lightseagreen", "lightskyblue", "lightslategray", "lightslategrey",
+      "lightsteelblue", "lightyellow", "lime", "limegreen", "linen", "magenta", "maroon", "mediumaquamarine",
+      "mediumblue", "mediumorchid", "mediumpurple", "mediumseagreen", "mediumslateblue", "mediumspringgreen",
+      "mediumturquoise", "mediumvioletred", "midnightblue", "mintcream", "mistyrose", "moccasin", "navajowhite",
+      "navy", "oldlace", "olive", "olivedrab", "orange", "orangered", "orchid", "palegoldenrod", "palegreen",
+      "paleturquoise", "palevioletred", "papayawhip", "peachpuff", "peru", "pink", "plum", "powderblue",
+      "purple", "rebeccapurple", "red", "rosybrown", "royalblue", "saddlebrown", "salmon", "sandybrown", "seagreen",
+      "seashell", "sienna", "silver", "skyblue", "slateblue", "slategray", "slategrey", "snow", "springgreen",
+      "steelblue", "tan", "teal", "thistle", "tomato", "transparent", "turquoise", "violet", "wheat", "white",
+      "whitesmoke", "yellow", "yellowgreen", "calc", "-moz-calc", "rgb", "hsl", "rgba", "hsla" ];
+  ok(testValues(values, expected), "property border-top's values.");
+
+  // tests no keywords or colors
+  var prop = "padding-bottom";
+  var values = getCSSValuesForProperty(prop);
+  var expected = [ "initial", "inherit", "unset", "calc", "-moz-calc" ];
+  ok(testValues(values, expected), "property padding-bottom's values.");
+
+  // test proprety
+  var prop = "display";
+  var values = getCSSValuesForProperty(prop);
+  var expected = [ "initial", "inherit", "unset", "none", "inline", "block", "inline-block", "list-item",
+      "table", "inline-table", "table-row-group", "table-header-group", "table-footer-group", "table-row",
+      "table-column-group", "table-column", "table-cell", "table-caption", "-moz-box", "-moz-inline-box",
+      "-moz-grid", "-moz-inline-grid", "-moz-grid-group", "-moz-grid-line", "-moz-stack", "-moz-inline-stack",
+      "-moz-deck", "-moz-popup", "-moz-groupbox",
+      "flex", "inline-flex", "-webkit-box", "-webkit-inline-box",
+      "-webkit-flex", "-webkit-inline-flex",
+      "grid", "inline-grid",
+      "ruby", "ruby-base", "ruby-base-container", "ruby-text", "ruby-text-container",
+      "contents" ];
+  ok(testValues(values, expected), "property display's values.");
+
+  // test property
+  var prop = "float";
+  var values = getCSSValuesForProperty(prop);
+  var expected = [ "initial", "inherit", "unset", "none", "left", "right", "inline-start", "inline-end" ];
+  ok(testValues(values, expected), "property float's values.");
+
+  // Test property with "auto"
+  var prop = "margin";
+  var values = getCSSValuesForProperty(prop);
+  var expected = [ "-moz-calc", "initial", "unset", "auto", "calc", "inherit" ];
+  ok(testValues(values, expected), "property margin's values.");
+
+  // Test property with "normal"
+  var prop = "font-style";
+  var values = getCSSValuesForProperty(prop);
+  var expected = [ "initial", "inherit", "unset", "italic", "normal", "oblique" ];
+  ok(testValues(values, expected), "property font-style's values.");
+
+  // Test property with "cubic-bezier" and "step".
+  var prop = "-moz-transition";
+  var values = getCSSValuesForProperty(prop);
+  var expected = [ "initial", "all", "unset", "cubic-bezier", "ease", "ease-in", "ease-in-out",
+                   "ease-out", "inherit", "linear", "none", "step-end", "step-start",
+                   "steps" ];
+  ok(testValues(values, expected), "property -moz-transition's values.");
+
+  // test invalid property
+  var prop = "invalidProperty";
+  try {
+    getCSSValuesForProperty(prop);
+    ok(false, "invalid property should throw an exception");
+  }
+  catch(e) {
+    // test passed
+  }
+
+  // test border-image propery, for bug 973345
+  var prop = "border-image";
+  var values = getCSSValuesForProperty(prop);
+  var expected = [ "-moz-calc", "initial", "unset", "aliceblue",
+      "antiquewhite", "aqua", "aquamarine", "azure", "beige", "bisque", "black", "blanchedalmond", "blue", "blueviolet",
+      "brown", "burlywood", "cadetblue", "calc", "chartreuse", "chocolate", "coral", "cornflowerblue", "cornsilk",
+      "crimson", "currentColor", "cyan", "darkblue", "darkcyan", "darkgoldenrod", "darkgray", "darkgreen", "darkgrey", "darkkhaki",
+      "darkmagenta", "darkolivegreen", "darkorange", "darkorchid", "darkred", "darksalmon", "darkseagreen",
+      "darkslateblue", "darkslategray", "darkslategrey", "darkturquoise", "darkviolet", "dashed", "deeppink",
+      "deepskyblue", "dimgray", "dimgrey", "dodgerblue", "dotted", "double", "fill", "firebrick", "floralwhite",
+      "forestgreen", "fuchsia", "gainsboro", "ghostwhite", "gold", "goldenrod", "gray", "grey", "green", "greenyellow",
+      "groove", "hidden", "honeydew", "hotpink", "hsl", "hsla", "indianred", "indigo", "inherit", "inset", "ivory",
+      "khaki", "lavender", "lavenderblush", "lawngreen", "lemonchiffon", "lightblue", "lightcoral", "lightcyan",
+      "lightgoldenrodyellow", "lightgray", "lightgreen", "lightgrey", "lightpink", "lightsalmon", "lightseagreen",
+      "lightskyblue", "lightslategray", "lightslategrey", "lightsteelblue", "lightyellow", "lime", "limegreen",
+      "linen", "logical", "magenta", "maroon", "medium", "mediumaquamarine", "mediumblue", "mediumorchid",
+      "mediumpurple", "mediumseagreen", "mediumslateblue", "mediumspringgreen", "mediumturquoise",
+      "mediumvioletred", "midnightblue", "mintcream", "mistyrose", "moccasin", "navajowhite", "navy", "none",
+      "oldlace", "olive", "olivedrab", "orange", "orangered", "orchid", "outset", "palegoldenrod", "palegreen",
+      "paleturquoise", "palevioletred", "papayawhip", "peachpuff", "peru", "physical", "pink", "plum", "powderblue",
+      "purple", "rebeccapurple", "red", "repeat", "rgb", "rgba", "ridge", "rosybrown", "round", "royalblue", "saddlebrown",
+      "salmon", "sandybrown", "seagreen", "seashell", "sienna", "silver", "skyblue", "slateblue", "slategray", "slategrey",
+      "snow", "solid", "springgreen", "steelblue", "stretch", "tan", "teal", "thick", "thin", "thistle", "tomato",
+      "transparent", "turquoise", "-moz-element", "-moz-image-rect", "url", "violet", "wheat", "white", "whitesmoke",
+      "yellow", "yellowgreen", "linear-gradient", "radial-gradient", "repeating-linear-gradient",
+      "repeating-radial-gradient", "-moz-linear-gradient", "-moz-radial-gradient", "-moz-repeating-linear-gradient",
+      "-moz-repeating-radial-gradient" ]
+  ok(testValues(values, expected), "property border-image's values.");
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(do_test);
+
+</script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=877690">Mozilla Bug 877690</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_color_to_rgba.html b/layout/inspector/tests/test_color_to_rgba.html
new file mode 100644
index 000000000..d8279e384
--- /dev/null
+++ b/layout/inspector/tests/test_color_to_rgba.html
@@ -0,0 +1,55 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test inDOMUtils::ColorToRGBA</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript;version=1.8">
+  let utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+                           .getService(SpecialPowers.Ci.inIDOMUtils);
+
+  testColor("red", {r:255, g:0, b:0, a:1});
+  testColor("#f00", {r:255, g:0, b:0, a:1});
+  testColor("#ff0000", {r:255, g:0, b:0, a:1});
+  testColor("ff0000", null);
+  testColor("rgb(255,0,0)", {r:255, g:0, b:0, a:1});
+  testColor("rgba(255,0,0)", {r:255, g:0, b:0, a:1});
+  testColor("rgb(255,0,0,0.7)", {r:255, g:0, b:0, a:0.7});
+  testColor("rgba(255,0,0,0.7)", {r:255, g:0, b:0, a:0.7});
+  testColor("rgb(50%,75%,60%)", {r:128, g:191, b:153, a:1});
+  testColor("rgba(50%,75%,60%)", {r:128, g:191, b:153, a:1});
+  testColor("rgb(100%,50%,25%,0.7)", {r:255, g:128, b:64, a:0.7});
+  testColor("rgba(100%,50%,25%,0.7)", {r:255, g:128, b:64, a:0.7});
+  testColor("hsl(320,30%,10%)", {r:33, g:17, b:28, a:1});
+  testColor("hsla(320,30%,10%)", {r:33, g:17, b:28, a:1});
+  testColor("hsl(170,60%,40%,0.9)", {r:40, g:163, b:142, a:0.9});
+  testColor("hsla(170,60%,40%,0.9)", {r:40, g:163, b:142, a:0.9});
+
+  function testColor(color, expected) {
+    let rgb = utils.colorToRGBA(color);
+
+    if (rgb === null) {
+      ok(expected === null, "color: " + color + " returns null");
+      return;
+    }
+
+    let {r, g, b, a} = rgb;
+
+    is(r, expected.r, "color: " + color + ", red component is converted correctly");
+    is(g, expected.g, "color: " + color + ", green component is converted correctly");
+    is(b, expected.b, "color: " + color + ", blue component is converted correctly");
+    is(Math.round(a * 10) / 10, expected.a, "color: " + color + ", alpha component is a converted correctly");
+  }
+  </script>
+</head>
+<body>
+<h1>Test inDOMUtils::ColorToRGBA</h1>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_css_property_is_shorthand.html b/layout/inspector/tests/test_css_property_is_shorthand.html
new file mode 100644
index 000000000..e5fbcc1c9
--- /dev/null
+++ b/layout/inspector/tests/test_css_property_is_shorthand.html
@@ -0,0 +1,51 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test inDOMUtils::CssPropertyIsShorthand</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript;version=1.8">
+  let utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+                           .getService(SpecialPowers.Ci.inIDOMUtils);
+
+  let tests = [
+    {
+      property: "color",
+      expected: false
+    },
+    {
+      property: "background",
+      expected: true
+    },
+    {
+      property: "--anything",
+      expected: false
+    }
+  ];
+
+  for (let {property, expected} of tests) {
+    let result = utils.cssPropertyIsShorthand(property);
+    is(result, expected, "checking whether " + property + " is shorthand");
+  }
+
+  let sawException = false;
+  try {
+    let result = utils.cssPropertyIsShorthand("nosuchproperty");
+  } catch (e) {
+    sawException = true;
+  }
+  ok(sawException, "checking whether nosuchproperty throws");
+
+  </script>
+</head>
+<body>
+<h1>Test inDOMUtils::CssPropertyIsShorthand</h1>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_css_property_is_valid.html b/layout/inspector/tests/test_css_property_is_valid.html
new file mode 100644
index 000000000..21f00bf18
--- /dev/null
+++ b/layout/inspector/tests/test_css_property_is_valid.html
@@ -0,0 +1,105 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test inDOMUtils::CssPropertyIsValid</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript;version=1.8">
+  let utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+                           .getService(SpecialPowers.Ci.inIDOMUtils);
+
+  let tests = [
+    {
+      property: "color",
+      value: "red",
+      expected: true
+    },
+    {
+      property: "display",
+      value: "none",
+      expected: true
+    },
+    {
+      property: "display",
+      value: "red",
+      expected: false
+    },
+    {
+      property: "displayx",
+      value: "none",
+      expected: false
+    },
+    {
+      property: "border",
+      value: "1px solid blue",
+      expected: true
+    },
+    {
+      property: "border",
+      value: "1 solid blue",
+      expected: false
+    },
+    {
+      property: "border",
+      value: "1px underline blue",
+      expected: false
+    },
+    {
+      property: "border",
+      value: "1px solid",
+      expected: true
+    },
+    {
+      property: "color",
+      value: "blue !important",
+      expected: true
+    },
+    {
+      property: "color",
+      value: "blue ! important",
+      expected: true
+    },
+    {
+      property: "color",
+      value: "blue !impoxxxrtant",
+      expected: false
+    },
+    {
+      property: "color",
+      value: "red; background:green;",
+      expected: false
+    },
+    {
+      property: "content",
+      value: "\"hello\"",
+      expected: true
+    },
+    {
+      property: "color",
+      value: "var(--some-kind-of-green)",
+      expected: true
+    }
+  ];
+
+  for (let {property, value, expected} of tests) {
+    let valid = utils.cssPropertyIsValid(property, value);
+
+    if (expected) {
+      ok(valid, property + ":" + value + " is valid");
+    } else {
+      ok(!valid, property + ":" + value + " is not valid");
+    }
+  }
+  </script>
+</head>
+<body>
+<h1>Test inDOMUtils::CssPropertyIsValid</h1>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_getCSSPseudoElementNames.html b/layout/inspector/tests/test_getCSSPseudoElementNames.html
new file mode 100644
index 000000000..cdb4572d4
--- /dev/null
+++ b/layout/inspector/tests/test_getCSSPseudoElementNames.html
@@ -0,0 +1,59 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test inDOMUtils::getCSSPseudoElementNames</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript;version=1.8">
+  let utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+                           .getService(SpecialPowers.Ci.inIDOMUtils);
+
+  let expected = new Set([
+    ":after",
+    ":before",
+    ":backdrop",
+    ":first-letter",
+    ":first-line",
+    ":placeholder",
+    ":-moz-color-swatch",
+    ":-moz-focus-inner",
+    ":-moz-focus-outer",
+    ":-moz-list-bullet",
+    ":-moz-list-number",
+    ":-moz-math-anonymous",
+    ":-moz-meter-bar",
+    ":-moz-placeholder",
+    ":-moz-progress-bar",
+    ":-moz-range-progress",
+    ":-moz-range-thumb",
+    ":-moz-range-track",
+    ":-moz-selection",
+  ]);
+
+  let names = utils.getCSSPseudoElementNames();
+  for (let name of names) {
+    ok(expected.has(name), name + " is included");
+    expected.delete(name);
+  }
+
+  if (expected.size > 0) {
+    todo_is(expected.size, 0,
+            "ideally all pseudo-element names would be listed in this test");
+    for (let extra of expected) {
+      info("extra element: " + extra);
+    }
+  }
+
+  </script>
+</head>
+<body>
+<h1>Test inDOMUtils::getCSSPseudoElementNames</h1>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_getRelativeRuleLine.html b/layout/inspector/tests/test_getRelativeRuleLine.html
new file mode 100644
index 000000000..a1481a49d
--- /dev/null
+++ b/layout/inspector/tests/test_getRelativeRuleLine.html
@@ -0,0 +1,69 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test inDOMUtils::getRelativeRuleLine</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <style>
+    @supports (not (whatever: 72 zq)) {
+      #test {
+	background-color: #f0c;
+      }
+    }
+
+    #test {
+      color: #f0c;
+    }
+  </style>
+  <style>#test { color: red; }</style>
+  <style>
+     @invalidatkeyword {
+     }
+
+     #test {
+       color: blue;
+     }
+  </style>
+  <script type="application/javascript;version=1.8">
+  let utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+                           .getService(SpecialPowers.Ci.inIDOMUtils);
+
+  let tests = [
+    { sheetNo: 0, ruleNo: 0, lineNo: 1, columnNo: 1 },
+    { sheetNo: 1, ruleNo: 0, lineNo: 2, columnNo: 15 },
+    { sheetNo: 1, ruleNo: 1, lineNo: 8, columnNo: 5 },
+    { sheetNo: 2, ruleNo: 0, lineNo: 1, columnNo: 1 },
+    { sheetNo: 2, ruleNo: 1, lineNo: 0, columnNo: 1 },
+    { sheetNo: 3, ruleNo: 0, lineNo: 5, columnNo: 6 },
+  ];
+
+  function doTest() {
+    document.styleSheets[2].insertRule("body{}", 1);
+    for (let test of tests) {
+      let sheet = document.styleSheets[test.sheetNo];
+      let rule = sheet.cssRules[test.ruleNo];
+      let line = utils.getRelativeRuleLine(rule);
+      let column = utils.getRuleColumn(rule);
+      info("testing sheet " + test.sheetNo + ", rule " + test.ruleNo);
+      is(line, test.lineNo, "line number is correct");
+      is(column, test.columnNo, "column number is correct");
+    }
+
+    SimpleTest.finish();
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  addLoadEvent(doTest);
+  </script>
+</head>
+<body>
+<h1>Test inDOMUtils::getRelativeRuleLine</h1>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_get_all_style_sheets.html b/layout/inspector/tests/test_get_all_style_sheets.html
new file mode 100644
index 000000000..7e5a4d49b
--- /dev/null
+++ b/layout/inspector/tests/test_get_all_style_sheets.html
@@ -0,0 +1,44 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=734861
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 734861</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+
+  /** Test for Bug 734861 **/
+
+  SimpleTest.waitForExplicitFinish();
+
+  function runTest() {
+    var utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+                             .getService(SpecialPowers.Ci.inIDOMUtils);
+    var res = utils.getAllStyleSheets(document);
+
+    var foundUA = false;
+    for (var i = 0; i < res.length; i++) {
+      if (res[i].href === "resource://gre-resources/ua.css") {
+        foundUA = true;
+        break;
+      }
+    }
+    ok(foundUA, "UA sheet should be returned with all the other sheets.");
+    SimpleTest.finish();
+  }
+
+  </script>
+</head>
+<body onload="runTest();">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=734861">Mozilla Bug 734861</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_is_valid_css_color.html b/layout/inspector/tests/test_is_valid_css_color.html
new file mode 100644
index 000000000..ef5eef32e
--- /dev/null
+++ b/layout/inspector/tests/test_is_valid_css_color.html
@@ -0,0 +1,91 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test inDOMUtils::isValidCSSColor</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript;version=1.8">
+  let utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+                           .getService(SpecialPowers.Ci.inIDOMUtils);
+
+  // Color names
+  let colors = utils.getCSSValuesForProperty("color");
+  let notColor = ["hsl", "hsla", "inherit", "initial", "rgb", "rgba",
+                  "unset", "transparent", "currentColor"];
+  for (let color of colors) {
+    if (notColor.indexOf(color) !== -1) {
+      continue;
+    }
+    ok(utils.isValidCSSColor(color), color + " is a valid color");
+    ok(!utils.isValidCSSColor("xxx" + color), "xxx" + color + " is not a valid color");
+  }
+
+  // rgb(a)
+  for (let i = 0; i <= 265; i++) {
+    ok(utils.isValidCSSColor("rgb(" + i + ",0,0)"), "rgb(" + i + ",0,0) is a valid color");
+    ok(utils.isValidCSSColor("rgb(0," + i + ",0)"), "rgb(0," + i + ",0) is a valid color");
+    ok(utils.isValidCSSColor("rgb(0,0," + i + ")"), "rgb(0,0," + i + ") is a valid color");
+    ok(utils.isValidCSSColor("rgba(" + i + ",0,0,0.2)"), "rgba(" + i + ",0,0,0.2) is a valid color");
+    ok(utils.isValidCSSColor("rgba(0," + i + ",0,0.5)"), "rgba(0," + i + ",0,0.5) is a valid color");
+    ok(utils.isValidCSSColor("rgba(0,0," + i + ",0.7)"), "rgba(0,0," + i + ",0.7) is a valid color");
+
+    ok(!utils.isValidCSSColor("rgbxxx(" + i + ",0,0)"), "rgbxxx(" + i + ",0,0) is not a valid color");
+    ok(!utils.isValidCSSColor("rgbxxx(0," + i + ",0)"), "rgbxxx(0," + i + ",0) is not a valid color");
+    ok(!utils.isValidCSSColor("rgbxxx(0,0," + i + ")"), "rgbxxx(0,0," + i + ") is not a valid color");
+  }
+
+  // rgb(a) (%)
+  for (let i = 0; i <= 110; i++) {
+    ok(utils.isValidCSSColor("rgb(" + i + "%,0%,0%)"), "rgb(" + i + "%,0%,0%) is a valid color");
+    ok(utils.isValidCSSColor("rgb(0%," + i + "%,0%)"), "rgb(0%," + i + "%,0%) is a valid color");
+    ok(utils.isValidCSSColor("rgb(0%,0%," + i + "%)"), "rgb(0%,0%," + i + "%) is a valid color");
+    ok(utils.isValidCSSColor("rgba(" + i + "%,0%,0%,0.2)"), "rgba(" + i + "%,0%,0%,0.2) is a valid color");
+    ok(utils.isValidCSSColor("rgba(0%," + i + "%,0%,0.5)"), "rgba(0%," + i + "%,0%,0.5) is a valid color");
+    ok(utils.isValidCSSColor("rgba(0%,0%," + i + "%,0.7)"), "rgba(0%,0%," + i + "%,0.7) is a valid color");
+
+    ok(!utils.isValidCSSColor("rgbaxxx(" + i + "%,0%,0%,0.2)"), "rgbaxxx(" + i + "%,0%,0%,0.2) is not a valid color");
+    ok(!utils.isValidCSSColor("rgbaxxx(0%," + i + "%,0%,0.5)"), "rgbaxxx(0%," + i + "%,0%,0.5) is not a valid color");
+    ok(!utils.isValidCSSColor("rgbaxxx(0%,0%," + i + "%,0.7)"), "rgbaxxx(0%,0%," + i + "%,0.7) is not a valid color");
+  }
+
+  // hsl(a)
+  for (let i = 0; i <= 370; i++) {
+    ok(utils.isValidCSSColor("hsl(" + i + ",30%,10%)"), "rgb(" + i + ",30%,10%) is a valid color");
+    ok(utils.isValidCSSColor("hsla(" + i + ",60%,70%,0.2)"), "rgba(" + i + ",60%,70%,0.2) is a valid color");
+  }
+  for (let i = 0; i <= 110; i++) {
+    ok(utils.isValidCSSColor("hsl(100," + i + "%,20%)"), "hsl(100," + i + "%,20%) is a valid color");
+    ok(utils.isValidCSSColor("hsla(100,20%," + i + "%,0.6)"), "hsla(100,20%," + i + "%,0.6) is a valid color");
+  }
+
+  // hex
+  for (let i = 0; i <= 255; i++) {
+    let hex = (i).toString(16);
+    if (hex.length === 1) {
+      hex = 0 + hex;
+    }
+    ok(utils.isValidCSSColor("#" + hex + "7777"), "#" + hex + "7777 is a valid color");
+    ok(utils.isValidCSSColor("#77" + hex + "77"), "#77" + hex + "77 is a valid color");
+    ok(utils.isValidCSSColor("#7777" + hex), "#7777" + hex + " is a valid color");
+  }
+  ok(!utils.isValidCSSColor("#kkkkkk"), "#kkkkkk is not a valid color");
+
+  // short hex
+  for (let i = 0; i <= 16; i++) {
+    let hex = (i).toString(16);
+    ok(utils.isValidCSSColor("#" + hex + hex + hex), "#" + hex + hex + hex + " is a valid color");
+  }
+  ok(!utils.isValidCSSColor("#ggg"), "#ggg is not a valid color");
+  </script>
+</head>
+<body>
+<h1>Test inDOMUtils::isValidCSSColor</h1>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_isinheritableproperty.html b/layout/inspector/tests/test_isinheritableproperty.html
new file mode 100644
index 000000000..6bbb1650f
--- /dev/null
+++ b/layout/inspector/tests/test_isinheritableproperty.html
@@ -0,0 +1,38 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=699592
+-->
+<head>
+  <title>Test for nsIDOMUtils::isInheritedProperty</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+
+function do_test() {
+  var utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+    .getService(SpecialPowers.Ci.inIDOMUtils);
+
+  is(utils.isInheritedProperty("font-size"), true, "font-size is inherited.");
+
+  is(utils.isInheritedProperty("min-width"), false, "min-width is not inherited.");
+
+  is(utils.isInheritedProperty("font"), true, "shorthand font property is inherited.");
+
+  is(utils.isInheritedProperty("border"), false, "shorthand border property not inherited.");
+  is(utils.isInheritedProperty("garbage"), false, "Unknown property isn't inherited.");
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(do_test);
+
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/layout/inspector/tests/test_parseStyleSheet.html b/layout/inspector/tests/test_parseStyleSheet.html
new file mode 100644
index 000000000..f7ddf6e9e
--- /dev/null
+++ b/layout/inspector/tests/test_parseStyleSheet.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+    https://bugzilla.mozilla.org/show_bug.cgi?id=1195978
+-->
+  <head>
+    <title>Test for Bug 1195978</title>
+    <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+    <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+    <style>
+      body {
+        color: red;
+      }
+    </style>
+  </head>
+  <body>
+    <script type="application/javascript">
+var domUtils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+               .getService(SpecialPowers.Ci.inIDOMUtils);
+
+var sheet = document.styleSheets[1];
+is(domUtils.getRelativeRuleLine(sheet.cssRules[0]), 2,
+   "initial relative rule line");
+is(domUtils.getRuleLine(sheet.cssRules[0]), 11,
+   "initial rule line");
+
+domUtils.parseStyleSheet(sheet, "\nbody {\n  color: blue;\n}\n");
+is(domUtils.getRelativeRuleLine(sheet.cssRules[0]), 2,
+   "relative rule line after reparsing");
+is(domUtils.getRuleLine(sheet.cssRules[0]), 11,
+   "relative rule line after reparsing");
+    </script>
+  </body>
+</html>
diff --git a/layout/inspector/tests/test_parseStyleSheetImport.html b/layout/inspector/tests/test_parseStyleSheetImport.html
new file mode 100644
index 000000000..73fef2d51
--- /dev/null
+++ b/layout/inspector/tests/test_parseStyleSheetImport.html
@@ -0,0 +1,83 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+    https://bugzilla.mozilla.org/show_bug.cgi?id=1202095
+-->
+  <head>
+    <title>Test for Bug 1202095</title>
+    <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+    <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+    <style>
+      @import url('bug1202095.css');
+      @import url('bug1202095-2.css');
+    </style>
+  </head>
+  <body>
+    <script type="application/javascript">
+var domUtils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+               .getService(SpecialPowers.Ci.inIDOMUtils);
+
+function do_test() {
+  var sheet = document.styleSheets[1];
+  var importRule = sheet.cssRules[0];
+  is(importRule.type, SpecialPowers.Ci.nsIDOMCSSRule.IMPORT_RULE,
+     "initial sheet has @import rule");
+
+  var importedSheet = importRule.styleSheet;
+  importedSheet.deleteRule(0);
+  is(importedSheet.cssRules.length, 0, "imported sheet now has no rules");
+
+  // "suffixed" refers to the "-2".
+  var suffixedSheet = sheet.cssRules[1].styleSheet;
+  domUtils.parseStyleSheet(suffixedSheet, "");
+  is(suffixedSheet.cssRules.length, 0, "second imported sheet now has no rules");
+
+  // Re-parse the style sheet, preserving the imports.
+  domUtils.parseStyleSheet(sheet, "@import url('bug1202095.css');" +
+                           "@import url('bug1202095-2.css');");
+  is(sheet.cssRules[0].type, SpecialPowers.Ci.nsIDOMCSSRule.IMPORT_RULE,
+     "re-parsed sheet has @import rule");
+  is(sheet.cssRules[0].styleSheet, importedSheet,
+     "imported sheet has not changed");
+  is(sheet.cssRules[1].styleSheet, suffixedSheet,
+     "second imported sheet has not changed");
+
+  // Re-parse the style sheet, preserving both imports, but changing
+  // the order.
+  domUtils.parseStyleSheet(sheet, "@import url('bug1202095-2.css');" +
+                           "@import url('bug1202095.css');");
+  is(sheet.cssRules[0].styleSheet, suffixedSheet,
+     "reordering preserved suffixed style sheet");
+  is(sheet.cssRules[1].styleSheet, importedSheet,
+     "reordering preserved unsuffixed style sheet");
+
+  // Re-parse the style sheet, removing the imports.
+  domUtils.parseStyleSheet(sheet, "");
+  is(sheet.cssRules.length, 0, "style sheet now has no rules");
+
+  // Re-parse the style sheet, adding one import back.  This should
+  // not allow reuse.
+  domUtils.parseStyleSheet(sheet, "@import url('bug1202095.css');");
+  is(sheet.cssRules[0].type, SpecialPowers.Ci.nsIDOMCSSRule.IMPORT_RULE,
+     "re-re-re-parsed sheet has @import rule");
+  isnot(sheet.cssRules[0].styleSheet, importedSheet,
+     "imported sheet has changed now");
+
+  // Re-parse the style sheet, importing the same URL twice.
+  // The style sheet should be reused once, but not two times.
+  importedSheet = sheet.cssRules[0].styleSheet;
+  domUtils.parseStyleSheet(sheet, "@import url('bug1202095.css');" +
+     "@import url('bug1202095.css');");
+  is(sheet.cssRules[0].styleSheet, importedSheet,
+     "first imported sheet is reused");
+  isnot(sheet.cssRules[1].styleSheet, importedSheet,
+     "second imported sheet is reused");
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(do_test);
+    </script>
+  </body>
+</html>
diff --git a/layout/inspector/tests/test_selectormatcheselement.html b/layout/inspector/tests/test_selectormatcheselement.html
new file mode 100644
index 000000000..a052f74d1
--- /dev/null
+++ b/layout/inspector/tests/test_selectormatcheselement.html
@@ -0,0 +1,90 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1037519
+-->
+<head>
+  <title>Test for nsIDOMUtils::selectorMatchesElement</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <style type="text/css">
+    #foo,
+    #bar,
+    #foo::before {
+      color: red;
+    }
+    #foo::before,
+    #bar::before {
+      content: 'foo-before';
+      color: green;
+    }
+    #foo::after,
+    #bar::after {
+      content: 'foo-after';
+      color: blue;
+    }
+    #foo::first-line,
+    #bar::first-line {
+      text-decoration: underline;
+    }
+    #foo::first-letter,
+    #bar::first-letter {
+      font-variant: small-caps;
+    }
+  </style>
+</head>
+<body>
+<div id="foo">foo content</div>
+<pre id="test">
+<script type="application/javascript">
+
+function do_test() {
+  var utils = SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
+    .getService(SpecialPowers.Ci.inIDOMUtils);
+
+  var element = document.querySelector("#foo");
+
+  var elementRules = utils.getCSSStyleRules(element);
+  var elementRule = elementRules.GetElementAt(elementRules.Count() - 1);
+
+  is (utils.selectorMatchesElement(element, elementRule, 0), true,
+    "Matches #foo");
+  is (utils.selectorMatchesElement(element, elementRule, 1), false,
+    "Doesn't match #bar");
+  is (utils.selectorMatchesElement(element, elementRule, 0, ":bogus"), false,
+    "Doesn't match #foo with a bogus pseudo");
+  is (utils.selectorMatchesElement(element, elementRule, 2, ":bogus"), false,
+    "Doesn't match #foo::before with bogus pseudo");
+  is (utils.selectorMatchesElement(element, elementRule, 0, ":after"), false,
+    "Does match #foo::before with the :after pseudo");
+
+  checkPseudo(":before");
+  checkPseudo(":after");
+  checkPseudo(":first-letter");
+  checkPseudo(":first-line");
+
+  SimpleTest.finish();
+
+  function checkPseudo(pseudo) {
+    var rules = utils.getCSSStyleRules(element, pseudo);
+    var rule = rules.GetElementAt(rules.Count() - 1);
+
+    is (utils.selectorMatchesElement(element, rule, 0), false,
+      "Doesn't match without " + pseudo);
+    is (utils.selectorMatchesElement(element, rule, 1), false,
+      "Doesn't match without " + pseudo);
+
+    is (utils.selectorMatchesElement(element, rule, 0, pseudo), true,
+      "Matches on #foo" + pseudo);
+    is (utils.selectorMatchesElement(element, rule, 1, pseudo), false,
+      "Doesn't match on #bar" + pseudo);
+  }
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(do_test);
+
+</script>
+</pre>
+</body>
+</html>