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58 lines
1.9 KiB
HTML
58 lines
1.9 KiB
HTML
<!doctype html>
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<meta charset="utf-8">
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<title>Container Queries - Style Change Event for transitions</title>
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<link rel="help" href="https://drafts.csswg.org/css-transitions/#starting">
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<link rel="help" href="https://drafts.csswg.org/css-contain-3/#animated-containers">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="support/cq-testcommon.js"></script>
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<style>
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.container { container-type: size }
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#outer {
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width: 100px;
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color: green;
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}
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@container (min-width: 200px) {
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#inner { color: red }
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}
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@container (min-width: 400px) {
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#target {
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color: green;
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transition: color 1s step-start;
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}
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}
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</style>
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<div id="outer" class="container">
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<div id="inner" class="container">
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<div id="target">Green</div>
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</div>
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</div>
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</div>
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<script>
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setup(() => assert_implements_container_queries());
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const t = async_test("");
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const event_handler = t.step_func_done((e) => {
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assert_unreached("Transition event incorrectly triggered: " + e.type);
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});
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for (let event_name of ["transitionrun",
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"transitionstart",
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"transitionend",
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"transitioncancel"]) {
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target.addEventListener(event_name, event_handler);
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}
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outer.offsetTop;
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// #target is green. Making the #outer container 200px will turn #inner and
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// #target red through inheritance.
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outer.style.width = "200px";
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// Making #inner 400px will make #target green.
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inner.style.width = "400px";
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// Both changes above should happen in one style change event and should not
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// trigger any transition events. Run two rAFs to make sure any events have
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// time to trigger.
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requestAnimationFrame(() => requestAnimationFrame(t.step_func_done(() => {
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assert_equals(getComputedStyle(inner).color, "rgb(255, 0, 0)",
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"@container queries supported");
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})));
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</script>
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