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+++ b/dom/base/test/test_bug503481.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=503481
+-->
+<head>
+ <title>Test for Bug 503481</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body onload="done();">
+
+<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=503481"
+ target="_blank" >Mozilla Bug 503481</a>
+
+<p id="display"></p>
+
+<script>
+SimpleTest.waitForExplicitFinish();
+function done() {
+ is(firstRan, true, "first has run");
+ is(secondRan, true, "second has run");
+ is(thirdRan, true, "third has run");
+ SimpleTest.finish();
+}
+var reqs = [];
+function unblock(s) {
+ xhr = new XMLHttpRequest();
+ xhr.open("GET", "file_bug503481.sjs?unblock=" + s);
+ xhr.send();
+ reqs.push(xhr);
+}
+var firstRan = false, secondRan = false, thirdRan = false;
+function runFirst() { firstRan = true; }
+function runSecond() {
+ is(thirdRan, true, "should have run third already");
+ secondRan = true;
+}
+function runThird() {
+ is(secondRan, false, "shouldn't have unblocked second yet");
+ thirdRan = true;
+ unblock("B");
+}
+</script>
+<script id=firstScript async src="file_bug503481.sjs?blockOn=A&body=runFirst();"></script>
+<script id=firstScriptHelper>
+is(document.getElementById("firstScript").async, true,
+ "async set");
+is(document.getElementById("firstScriptHelper").async, false,
+ "async not set");
+document.getElementById("firstScript").async = false;
+is(document.getElementById("firstScript").async, false,
+ "async no longer set");
+is(document.getElementById("firstScript").hasAttribute("async"), false,
+ "async attribute no longer set");
+is(firstRan, false, "First async script shouldn't have run");
+unblock("A");
+</script>
+
+<script async src="file_bug503481.sjs?blockOn=B&body=runSecond();"></script>
+<script async src="file_bug503481.sjs?blockOn=C&body=runThird();"></script>
+<script>
+is(secondRan, false, "Second async script shouldn't have run");
+is(thirdRan, false, "Third async script shouldn't have run");
+unblock("C");
+</script>
+
+</body>
+</html>