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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1107378
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1107378</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript;version=1.7" src="unprefixing_service_utils.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=1107378">Mozilla Bug 1107378</a>
+<div id="display">
+  <iframe id="testIframe"></iframe>
+</div>
+<pre id="test">
+<script type="application/javascript;version=1.7">
+"use strict";
+SimpleTest.waitForExplicitFinish();
+
+/**
+ * This test checks that unprefixing is enabled for whitelisted domains, and
+ * that it's disabled for non-whitelisted domains.
+ *
+ * We do this using an iframe, in which we load a test file at a test domain,
+ * and we have the iframe report back to us (using postMessage) about
+ * whether unprefixing is working.
+ *
+ * High-level overview of the process here:
+ *  - First, we tweak prefs to enable unprefixing & enable the test-only
+ *    entries in our unprefixing whitelist.
+ *  - The rest of this test is driven by the "startNextTest()" method.
+ *    This method pops a hostname to test and loads a URL from that host
+ *    in the iframe.
+ *  - We then listen for test-results from the iframe, using the postMessage
+ *    handler in unprefixing_service_utils.js.
+ *  - When the iframe indicates that it's done, we call "startNextTest()"
+ *    again to pop the next host & load *that* in the iframe.
+ *  - When nothing remains to be popped, we're done.
+ */
+
+const IFRAME_TESTFILE = "unprefixing_service_iframe.html";
+
+// This function gets invoked when our iframe finishes a given round of testing.
+function startNextTest()
+{
+  // Test the next whitelisted host, if any remain.
+  if (gWhitelistedHosts.length > 0) {
+    let host = gWhitelistedHosts.pop();
+    info("Verifying that CSS Unprefixing Service is active, " +
+         "at whitelisted test-host '" + host + "'");
+    testHost(host, true);
+    return;
+  }
+
+  // Test the next not-whitelisted host, if any remain.
+  if (gNotWhitelistedHosts.length > 0) {
+    let host = gNotWhitelistedHosts.pop();
+    info("Verifying that CSS Unprefixing Service is inactive, " +
+         "at non-whitelisted test-host '" + host + "'");
+    testHost(host, false);
+    return;
+  }
+
+  // Both arrays empty --> we're done.
+  SimpleTest.finish();
+}
+
+function begin()
+{
+  // Before we start loading things in iframes, set up postMessage handler.
+  registerPostMessageListener(startNextTest);
+
+  // Turn on prefs & start the first test!
+  SpecialPowers.pushPrefEnv(
+    { set: [[PREF_UNPREFIXING_SERVICE, true],
+            [PREF_INCLUDE_TEST_DOMAINS, true],
+            // Make sure *native* -webkit prefix support is turned off. It's
+            // not whitelist-restricted, so if we left it enabled, it'd prevent
+            // us from being able to detect CSSUnprefixingService's domain
+            // whitelisting in this test.
+            ["layout.css.prefixes.webkit", false]]},
+    startNextTest);
+}
+
+begin();
+
+</script>
+</pre>
+</body>
+</html>