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56 lines
1.8 KiB
HTML
56 lines
1.8 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: behavior when transition-timing-function changes while transitioning</title>
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<meta name="assert" content="Checks a change to the transition-timing-function
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property does not affect an in-flight transition">
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<link rel="help" title="3. Starting of transitions" href="https://drafts.csswg.org/css-transitions/#starting">
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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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// Start a transition 50% of the way through with a linear timing function
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const div = addDiv(t, {
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style: 'transition: height 100s -50s linear; height: 0px',
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});
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getComputedStyle(div).height;
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div.style.height = '100px';
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assert_equals(
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getComputedStyle(div).height,
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'50px',
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'Transition should be initially 50% complete'
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);
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// Update the timing function
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div.style.transitionTimingFunction = 'steps(1, end)';
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// If the change to the transition-timing-function was reflected, the
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// computed height would now be '0px'.
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assert_equals(
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getComputedStyle(div).height,
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'50px',
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'Even after updating the transition-timing-function, the transition should be 50% complete'
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);
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// Wait a frame just to be sure that the changed timing function is not later
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// updated.
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await waitForFrame();
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assert_greater_than_equal(
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parseInt(getComputedStyle(div).height),
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50,
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'Even in the next frame the updated transition-timing-function should not apply'
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);
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}, 'Changes to transition-timing-function should not affect in-flight transitions');
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</script>
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</body>
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</html>
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