File: async_003.htm

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<!DOCTYPE html>
<html>
    <head>
        <title>An async script does not block the parser while downloading</title>
        <meta name="timeout" content="long">
        <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
        <meta description="This test ensures an async script does not block the parser while downloading." />
        <link rel="author" title="Microsoft" href="http://www.microsoft.com/" />
        <link rel="help" href="https://html.spec.whatwg.org/multipage/#attr-script-async"/>
        <script src="/resources/testharness.js"></script>
        <script src="/resources/testharnessreport.js"></script>
    </head>
    <body>
        <div id=log></div>
        <script type="text/javascript">
        var t = async_test("An async script does not block the parser while downloading");

        function timeout()
        {
            t.step(function(){ assert_equals(document.getElementById("testresult").innerHTML, "21")});
            t.done();
        }

        var timer = setTimeout(timeout, 4000);

        function log(text)
        {
            var textNode = document.createTextNode(text);
            document.getElementById("testresult").appendChild(textNode);
        }
        </script>

        <span id="testresult"></span>

        <script src="log.py?sec=3&id=1" async></script>
        <script>
            log('2');
        </script>
    </body>
</html>