stable-state-beforeunload-manual.html

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<!doctype html>

<title>stable state in beforeunload</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id=log></div>

<button>click this button and cancel navigation</button>

<a href="data:text/plain,FAIL: did not cancel navigation"></a>

<script>

async_test(function(t) {

  window.onbeforeunload = t.step_func(function(event) {

    var message = "foo bar";

    event.returnValue = message;

    return message;

});

  var button = document.querySelector('button');

  var link = document.querySelector('a');

  button.onclick = t.step_func(function() {

    v = document.createElement('video');

    v.src = 'data:,';

    assert_equals(v.networkState, v.NETWORK_NO_SOURCE, 'networkState before dialog');

    assert_equals(v.currentSrc, '', 'currentSrc before dialog');

    link.click();

    assert_equals(v.networkState, v.NETWORK_NO_SOURCE, 'networkState after dialog');

    assert_equals(v.currentSrc, '', 'currentSrc after dialog');

    t.done();

    window.onbeforeonload = null;

    button.remove();

});

});

</script>