<!DOCTYPE html>
<html>
<head>
    <script>
        if (window.testRunner) {
            testRunner.dumpAsText();
            testRunner.waitUntilDone();
        }
    </script>
</head>
<body>
    <p>Adding 'viewsource' to a frame after a document has loaded should not
    block JavaScript URL execution in the already-loaded document.</p>
    <iframe srcdoc="
        <script>
            window.onload = function() {
                window.parent.document.querySelector('iframe').setAttribute('viewsource', '');

                document.querySelector('a').click();

                alert(calledFunction ? 'PASS: Function called.' : 'FAIL: Function not called.');

                if (window.testRunner)
                    testRunner.notifyDone();
            };

            var calledFunction = false;
            function pass() {
                calledFunction = true;
            }
        </script>
        <a href='javascript:pass();'>Yay!</a>"></iframe>
</body>
</html>