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<!doctype html>
<html>
<head>
<meta charset=utf-8>
<title>CSS Transitions Test: 0-duration transition with delay applies after delay</title>
<meta name="assert" content="Transition with 0s duration and 0.3s delay applies property change after delay period">
<link rel="help" href="https://drafts.csswg.org/css-transitions/#starting">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./support/helper.js"></script>
</head>
<body>
<div id="log"></div>
<script>
promise_test(async t => {
const div = addDiv(t, {
style: 'transition: width 0.1s; width: 0px;'
});
// Flush initial state
getComputedStyle(div).width;
// First transition to 100px
div.style.width = '100px';
await waitForTransitionEnd(div);
// Change transition to 0s duration with 300ms delay
div.style.transition = 'width 0s linear 0.3s';
// Set width back to 0
div.style.width = '0px';
// Immediate check - should NOT have changed yet
const computedStart = getComputedStyle(div).width;
assert_equals(
computedStart,
'100px',
'Width should remain at 100px initially'
);
// Wait for transitionend (should trigger after 300ms delay)
await waitForTransitionEnd(div);
// Verify final state
const finalWidth = getComputedStyle(div).width;
assert_equals(
finalWidth,
'0px',
'Width should reset to 0 after delay'
);
}, '0-duration transition with delay applies change after delay period');
</script>
</body>
</html>
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