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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Transitions Test: Removing transitioning property from transition-property triggers transitioncancel</title>
<link rel="author" title="Martin Robinson" href="mailto:mrobinson@igalia.com">
<meta name="assert" content="Removing transitioning property from transition-property
causes transitioncancel.">
<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#event-dispatch">
<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>
<div id="log"></div>
<script>
promise_test(async t => {
// Create element and prepare to trigger a transition on it.
const div = addDiv(t, {
style: 'transition: background-color 0.25s; background-color: red;',
});
// Attach event listeners
const eventWatcher = new EventWatcher(t, div, ['transitioncancel']);
div.addEventListener('transitionend', t.step_func((event) => {
assert_unreached('transitionend event should not be fired');
}));
// Trigger transition
getComputedStyle(div).backgroundColor;
div.style.backgroundColor = 'green';
getComputedStyle(div).backgroundColor;
// Remove the transitioning property from transition-property asynchronously.
await waitForFrame();
div.style.transitionProperty = 'none';
await eventWatcher.wait_for('transitioncancel');
}, 'Removing a transitioning property from transition-property should trigger transitioncancel');
</script>
</body>
</html>
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