<!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>