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diff --git a/layout/base/tests/test_bug416896.html b/layout/base/tests/test_bug416896.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=416896
+-->
+<head>
+  <title>Test for Bug 416896</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <link rel="stylesheet" type="text/css" id="l"
+        href="data:text/css,a { color: green }"/>
+  <style type="text/css" id="i"> a { color: blue; } </style>
+   
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=416896">Mozilla Bug 416896</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 416896 **/
+
+ const InspectorUtils = SpecialPowers.InspectorUtils;
+
+ var inlineSheet = $("i").sheet;
+ isnot(inlineSheet, null, "Should have sheet here");
+
+ var linkedSheet = $("l").sheet;
+ isnot(linkedSheet, null, "Should have sheet here");
+
+ var inspectedRules = InspectorUtils.getCSSStyleRules(document.links[0]);
+
+ var seenInline = false;
+ var seenLinked = false;
+ 
+ for (var i = 0; i < inspectedRules.length; ++i)
+ {
+   var rule = inspectedRules[i];
+   var sheet = rule.parentStyleSheet;
+   if (SpecialPowers.unwrap(sheet) == inlineSheet) {
+     is(sheet.href, null, "It's an inline sheet");
+     is(seenInline, false, "Only one inline rule matches");
+     seenInline = true;
+   } else {
+     isnot(sheet.href, null, "Shouldn't have null href here " + i);
+     if (SpecialPowers.unwrap(sheet) == linkedSheet) {
+       is(seenLinked, false, "Only one linked rule matches");
+       seenLinked = true;
+     }
+   }
+ }
+
+ is(seenLinked, true, "Didn't find the linked rule?");
+ is(seenInline, true, "Didn't find the inline rule?");
+
+
+</script>
+</pre>
+</body>
+</html>
+