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