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+<!DOCTYPE html>
+<title>Test for Bug 922669</title>
+<script src="/MochiKit/MochiKit.js"></script>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/EventUtils.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
+
+<style></style>
+
+<script>
+var style = document.querySelector("style");
+
+var gValidTests = [
+ "::-moz-progress-bar",
+ "::-moz-progress-bar:hover",
+ "::-moz-progress-bar:active",
+ "::-moz-progress-bar:focus",
+ "::-moz-progress-bar:hover:focus",
+ "#a::-moz-progress-bar:hover",
+ ":hover::-moz-progress-bar"
+];
+
+var gInvalidTests = [
+ "::foo",
+ "::-moz-progress-bar::-moz-progress-bar",
+ "::-moz-progress-bar::first-line",
+ "::-moz-progress-bar#a",
+ "::-moz-progress-bar:invalid",
+ "::-moz-focus-inner:active"
+];
+
+gValidTests.forEach(function(aTest) {
+ style.textContent = aTest + "{}";
+ is(style.sheet.cssRules.length, 1, aTest);
+ style.textContent = "";
+});
+
+gInvalidTests.forEach(function(aTest) {
+ style.textContent = aTest + "{}";
+ is(style.sheet.cssRules.length, 0, aTest);
+ style.textContent = "";
+});
+</script>