1 files changed, 44 insertions, 0 deletions
diff --git a/dom/tests/mochitest/webcomponents/test_shadowroot_inert_element.html b/dom/tests/mochitest/webcomponents/test_shadowroot_inert_element.html
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index 000000000..ca525adad
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+++ b/dom/tests/mochitest/webcomponents/test_shadowroot_inert_element.html
@@ -0,0 +1,44 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=806506
+-->
+<head>
+  <title>Test for inert elements in ShadowRoot</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body onload="runChecks();">
+<div id="grabme"></div>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=806506">Bug 806506</a>
+<script>
+
+var element = document.getElementById("grabme");
+var shadow = element.createShadowRoot();
+
+// Check that <base> is inert.
+shadow.innerHTML = '<base href="http://www.example.org/" />';
+isnot(document.baseURI, "http://www.example.org/", "Base element should be inert in ShadowRoot.");
+
+SimpleTest.waitForExplicitFinish();
+
+// Check that <link> is inert.
+var numStyleBeforeLoad = document.styleSheets.length;
+
+shadow.innerHTML = '<link id="shadowlink" rel="stylesheet" type="text/css" href="inert_style.css" /><span id="shadowspan"></span>';
+shadow.applyAuthorStyles = true;
+var shadowSpan = shadow.getElementById("shadowspan");
+var shadowStyle = shadow.getElementById("shadowlink");
+
+function runChecks() {
+  isnot(getComputedStyle(shadowSpan, null).getPropertyValue("padding-top"), "10px", "Link element should be inert.");
+  is(document.styleSheets.length, numStyleBeforeLoad, "Document style count should remain the same because the style should not be in the doucment.");
+  is(shadow.styleSheets.length, 0, "Inert link should not add style to ShadowRoot.");
+  // Remove link to make sure we don't get assertions.
+  shadow.removeChild(shadowStyle);
+  SimpleTest.finish();
+};
+
+</script>
+</body>
+</html>