before-load-001.html

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- : https://bugzilla.mozilla.org/show_bug.cgi?id=1472172
This WPT test may be referenced by the following Test IDs:
- /css/css-transitions/before-load-001.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>CSS Transitions Test: Transitioning before load event</title>

<meta name="assert" content="Test checks that transitions are run even before the load event fires">

<!-- NOTE: This test covers unspecified behavior and should probably be

     removed. It this behavior *were* specified, it would probably be

     specified here: -->

<link rel="help" title="5. Transition Events" href="https://drafts.csswg.org/css-transitions/#starting">

<link rel="author" title="Rodney Rehm" href="http://rodneyrehm.de/en/">

<script src="/resources/testharness.js" type="text/javascript"></script>

<script src="/resources/testharnessreport.js" type="text/javascript"></script>

<script src="./support/helper.js" type="text/javascript"></script>

</head>

<body>

<script>

// Make sure a transition can run before the load event fires.

let loadEventFired = false;

window.addEventListener('load', () => {

  loadEventFired = true;

}, false);

async_test(t => {

  const div = addDiv(t, { style: 'transition: height .01s linear; ' +

                                 'height: 1px' });

  getComputedStyle(div).height;

  div.style.height = '100px';

  div.addEventListener('transitionrun', t.step_func_done(() => {

    assert_false(

      loadEventFired,

      'load event should not have fired yet'

);

    document.getElementById('cat').src = '';

  }));

});

</script>

<img src="support/cat.png?pipe=trickle(d1)" id="cat">

</body>

</html>