54 lines
2.1 KiB
HTML
54 lines
2.1 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: transition of a custom property with "transition-behavior: allows-discrete"</title>
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<meta name="assert" content="Checks that transitioning a custom property with 'transition-behavior: allows-discrete' works as expected">
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<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#transition-behavior-property">
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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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<style>
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.target {
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transition: --foo 10s step-start;
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transition-behavior: allow-discrete;
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--foo: bar;
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}
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</style>
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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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const div = addDiv(t, { class: 'target' });
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let transitionCount = 0;
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div.addEventListener("transitionstart", () => transitionCount++);
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// Trigger a transition on the custom property.
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getComputedStyle(div).getPropertyValue('--foo');
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div.style.setProperty('--foo', 'baz');
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getComputedStyle(div).getPropertyValue('--foo');
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// Wait two more frames to ensure only a single transition was started.
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await waitForFrame();
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await waitForFrame();
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assert_equals(transitionCount, 1, 'A single "transitionstart" event was dispatched');
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}, 'It is possible to transition an unregistered custom property using "transition-behavior: allows-discrete"');
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promise_test(async t => {
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const div = addDiv(t);
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div.style.setProperty('--foo', 'bar');
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// Trigger a transition on the custom property.
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getComputedStyle(div).getPropertyValue('--foo');
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div.style.transition = "--foo 10s allow-discrete";
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div.style.setProperty('--foo', 'baz');
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assert_equals(div.getAnimations()[0].transitionProperty, '--foo', 'A transition was started for the custom property');
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}, 'It is possible to transition an unregistered custom property using "transition-behavior: allows-discrete" when setting "transition-property" in the style change that yields the transition');
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</script>
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</body>
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</html>
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