diff --git a/layout/style/test/Makefile.in b/layout/style/test/Makefile.in
index b37075115a76..791ee2918e1f 100644
--- a/layout/style/test/Makefile.in
+++ b/layout/style/test/Makefile.in
@@ -70,6 +70,7 @@ _TEST_FILES =	test_bug74880.html \
 		test_bug221428.html \
 		test_bug302186.html \
 		test_bug319381.html \
+		test_bug357614.html \
 		test_bug365932.html \
 		test_bug372770.html \
 		test_bug373293.html \
@@ -77,6 +78,7 @@ _TEST_FILES =	test_bug74880.html \
 		test_bug379440.html \
 		test_bug379741.html \
 		test_bug383075.html \
+		test_bug387615.html \
 		test_dont_use_document_colors.html \
 		test_inherit_storage.html \
 		test_inherit_computation.html \
diff --git a/layout/style/test/test_bug357614.html b/layout/style/test/test_bug357614.html
new file mode 100644
index 000000000000..6b29d891b896
--- /dev/null
+++ b/layout/style/test/test_bug357614.html
@@ -0,0 +1,74 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=357614
+-->
+<head>
+  <title>Test for Bug 357614</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <style type="text/css" id="style">
+  a { color: red; }
+  a { color: green; }
+  </style>
+  <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=357614">Mozilla Bug 357614</a>
+<p id="display"><a href="http://www.FOO.com/" rel="next" rev="PREV" foo="bar">a link</a></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 357614 **/
+
+var sheet = document.getElementById("style").sheet;
+var rule1 = sheet.cssRules[0];
+var rule2 = sheet.cssRules[1];
+
+var a = document.getElementById("display").firstChild;
+var cs = getComputedStyle(a, "");
+
+function change_selector_text(selector) {
+  // rule2.selectorText = selector; // NOT IMPLEMENTED
+
+  sheet.deleteRule(1);
+  sheet.insertRule(selector + " { color: green; }", 1);
+}
+
+var cs_green = cs.getPropertyValue("color");
+change_selector_text('p');
+var cs_red = cs.getPropertyValue("color");
+isnot(cs_green, cs_red, "computed values for green and red are different");
+
+change_selector_text('a[href="http://www.FOO.com/"]');
+is(cs.getPropertyValue("color"), cs_green, "selector on href value matches case-sensitively");
+
+change_selector_text('a[href="http://www.foo.com/"]');
+is(cs.getPropertyValue("color"), cs_red, "selector on href value does not match case-insensitively");
+
+change_selector_text('a[rel="next"]');
+is(cs.getPropertyValue("color"), cs_green, "selector on rel value matches case-sensitively");
+
+change_selector_text('a[rel="NEXT"]');
+is(cs.getPropertyValue("color"), cs_green, "selector on rel value matches case-insensitively");
+
+change_selector_text('a[rev="PREV"]');
+is(cs.getPropertyValue("color"), cs_green, "selector on rev value matches case-sensitively");
+
+change_selector_text('a[rev="prev"]');
+is(cs.getPropertyValue("color"), cs_green, "selector on rev value matches case-insensitively");
+
+change_selector_text('a[foo="bar"]');
+is(cs.getPropertyValue("color"), cs_green, "selector on foo value matches case-sensitively");
+
+change_selector_text('a[foo="Bar"]');
+is(cs.getPropertyValue("color"), cs_red, "selector on foo value does not match case-insensitively");
+
+</script>
+</pre>
+</body>
+</html>
+
diff --git a/layout/style/test/test_bug387615.html b/layout/style/test/test_bug387615.html
new file mode 100644
index 000000000000..10ee803e6865
--- /dev/null
+++ b/layout/style/test/test_bug387615.html
@@ -0,0 +1,54 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=387615
+-->
+<head>
+  <title>Test for Bug 387615</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <style type="text/css">
+  @namespace html url(http://www.w3.org/1999/xhtml);
+  a { color: red; }
+  a[rel="next"] { color: green; }
+  a[html|rel="next"] { color: green; }
+  </style>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=387615">Mozilla Bug 387615</a>
+<p id="display"><a>link</a></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 387615 **/
+
+var htmlns = "http://www.w3.org/1999/xhtml";
+
+var a = document.getElementById("display").firstChild;
+
+function col(elt) { return getComputedStyle(elt, "").color; }
+
+var red_cs = col(a);
+a.setAttribute("rel", "next");
+var green_cs = col(a);
+isnot(green_cs, red_cs, "computed values for red and green are different");
+
+a.setAttribute("rel", "NEXT");
+is(col(a), green_cs, "rel attribute should match case insensitively");
+
+a.removeAttribute("rel");
+a.setAttributeNS(htmlns, "html:rel", "next");
+is(col(a), green_cs, "html:rel attribute should match case-sensitively");
+
+a.setAttributeNS(htmlns, "html:rel", "NEXT");
+is(col(a), red_cs, "html:rel attribute should not match case-insensitively");
+
+</script>
+</pre>
+</body>
+</html>
+
