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diff --git a/dom/svg/test/test_SVGLengthList.xhtml b/dom/svg/test/test_SVGLengthList.xhtml
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index 000000000..3e0dab736
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+++ b/dom/svg/test/test_SVGLengthList.xhtml
@@ -0,0 +1,159 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=515116
+-->
+<head>
+  <title>Tests specific to SVGLengthList</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="MutationEventChecker.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=515116">Mozilla Bug 515116</a>
+<p id="display"></p>
+<div id="content" style="display:none;">
+<svg id="svg" xmlns="http://www.w3.org/2000/svg" width="100" height="100">
+  <text id="text" x="10cm 20cm 30mc"/>
+  <rect id="rect" x="40" y="50"/>
+  <text id="text2" x="60"/>
+</svg>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+<![CDATA[
+
+SimpleTest.waitForExplicitFinish();
+
+/*
+This file runs a series of SVGLengthList specific tests. Generic SVGXxxList
+tests can be found in test_SVGxxxList.xhtml. Anything that can be generalized
+to other list types belongs there.
+*/
+
+function run_tests()
+{
+  document.getElementById('svg').pauseAnimations();
+
+  var text = document.getElementById("text");
+  var lengths = text.x.baseVal;
+
+  is(lengths.numberOfItems, 0, 'Checking numberOfItems');
+
+  // Test mutation events
+  // --- Initialization
+  eventChecker = new MutationEventChecker;
+  eventChecker.watchAttr(text, "x");
+  eventChecker.expect("modify");
+  text.textContent = "abc";
+  text.setAttribute("x", "10 20 30");
+  is(lengths.numberOfItems, 3, 'Checking numberOfItems');
+  // -- Actual changes
+  eventChecker.expect("modify modify modify modify modify");
+  lengths[0].value = 8;
+  lengths[0].valueInSpecifiedUnits = 9;
+  lengths[0].valueAsString = "10";
+  lengths[0].convertToSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_CM);
+  lengths[0].newValueSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_MM, 11);
+  // -- Redundant changes
+  eventChecker.expect("modify");
+  lengths[0].valueAsString = "10";
+  eventChecker.expect("");
+  lengths[0].value = 10;
+  lengths[0].valueInSpecifiedUnits = 10;
+  lengths[0].valueAsString = "10";
+  lengths[0].convertToSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_NUMBER);
+  lengths[0].newValueSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_NUMBER, 10);
+  // -- Invalid attribute
+  eventChecker.expect("modify");
+  text.setAttribute("x", ",20");
+  is(lengths.numberOfItems, 0, 'Checking that parsing stops at invalid token');
+  // -- Attribute removal
+  eventChecker.expect("remove");
+  text.removeAttribute("x");
+  // -- Non-existent attribute removal
+  eventChecker.expect("");
+  text.removeAttribute("x");
+  text.removeAttributeNS(null, "x");
+  eventChecker.finish();
+
+  // Test that the addition of an owned SVGLength to an SVGLengthList creates a
+  // copy of the SVGLength, and an unowned SVGLength does not make a copy
+  var text2 = document.getElementById("text2");
+  var rect = document.getElementById("rect");
+  var subtests = [
+    function initialize(aItem) {
+      text.removeAttribute("x");
+      return lengths.initialize(aItem);
+    },
+    function insertItemBefore(aItem) {
+      text.removeAttribute("x");
+      return lengths.insertItemBefore(aItem, 0);
+    },
+    function replaceItem(aItem) {
+      text.setAttribute("x", "10");
+      return lengths.replaceItem(aItem, 0);
+    },
+    function appendItem(aItem) {
+      text.removeAttribute("x");
+      return lengths.appendItem(aItem);
+    }
+  ];
+  subtests.forEach(function(aFunction) {
+    // -- Adding an unowned SVGLength
+    var name = aFunction.name;
+    var existingItem = document.getElementById("svg").createSVGLength();
+    var newItem = aFunction(existingItem);
+    is(newItem, lengths.getItem(0), name + " return value is correct when passed an unowned object");
+    is(newItem, existingItem, name + " did not make a copy when passed an unowned object");
+  });
+  subtests.forEach(function(aFunction) {
+    // -- Adding an SVGLength that is a baseVal
+    var name = aFunction.name;
+    var existingItem = rect.x.baseVal;
+    var newItem = aFunction(existingItem);
+    is(newItem, lengths.getItem(0), name + " return value is correct when passed a baseVal");
+    isnot(newItem, existingItem, name + " made a copy when passed a baseVal");
+    is(newItem.value, existingItem.value, name + " made a copy with the right values when passed a baseVal");
+    is(rect.x.baseVal, existingItem, name + " left the original object alone when passed a baseVal");
+  });
+  subtests.forEach(function(aFunction) {
+    // -- Adding an SVGLength that is an animVal
+    var name = aFunction.name;
+    var existingItem = rect.x.animVal;
+    var newItem = aFunction(existingItem);
+    is(newItem, lengths.getItem(0), name + " return value is correct when passed an animVal");
+    isnot(newItem, existingItem, name + " made a copy when passed an animVal");
+    is(newItem.value, existingItem.value, name + " made a copy with the right values when passed an animVal");
+    is(rect.x.animVal, existingItem, name + " left the original object alone when passed an animVal");
+  });
+  subtests.forEach(function(aFunction) {
+    // -- Adding an SVGLength that is in a baseVal list
+    var name = aFunction.name;
+    var existingItem = text2.x.baseVal.getItem(0);
+    var newItem = aFunction(existingItem);
+    is(newItem, lengths.getItem(0), name + " return value is correct when passed a baseVal list item");
+    isnot(newItem, existingItem, name + " made a copy when passed a baseVal list item");
+    is(newItem.value, existingItem.value, name + " made a copy with the right values when passed a baseVal list item");
+    is(text2.x.baseVal.getItem(0), existingItem, name + " left the original object alone when passed a baseVal list item");
+  });
+  subtests.forEach(function(aFunction) {
+    // -- Adding an SVGLength that is in a animVal list
+    var name = aFunction.name;
+    var existingItem = text2.x.animVal.getItem(0);
+    var newItem = aFunction(existingItem);
+    is(newItem, lengths.getItem(0), name + " return value is correct when passed a animVal list item");
+    isnot(newItem, existingItem, name + " made a copy when passed a animVal list item");
+    is(newItem.value, existingItem.value, name + " made a copy with the right values when passed a animVal list item");
+    is(text2.x.animVal.getItem(0), existingItem, name + " left the original object alone when passed a animVal list item");
+  });
+
+  SimpleTest.finish();
+}
+
+window.addEventListener("load", run_tests, false);
+
+]]>
+</script>
+</pre>
+</body>
+</html>