46 lines
1.6 KiB
HTML
46 lines
1.6 KiB
HTML
<!doctype html>
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<meta charset="utf8">
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<title>CSS Content Visibility: Contentvisibilityautostatechange fires once when c-v auto's dialog ancestor show</title>
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<link rel="author" title="Cathie Chen" href="mailto:cathiechen@igalia.com">
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<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
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<meta name="assert" content="Contentvisibilityautostatechange fires once when c-v auto's dialog ancestor show">
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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="/common/rendering-utils.js"></script>
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<style>
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#inner {
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content-visibility: auto;
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contain-intrinsic-size: 100px 100px;
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}
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</style>
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<dialog id="dialog">
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<div id="inner">
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<div style="height: 200px; width: 200px;">content</div>
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</div>
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<div id="spacer" style="height: 100000px;"></div>
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</dialog>
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<script>
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promise_test(async () => {
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let count = 0;
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inner.addEventListener("contentvisibilityautostatechange", (e) => {
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count++;
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});
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dialog.show();
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// getBoundingClientRect shouldn't trigger "contentvisibilityautostatechange", because the proximity to the viewport is not determined now.
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inner.getBoundingClientRect().height;
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// It takes at least one frame to determine the proximity to the viewport.
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await waitForAtLeastOneFrame();
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// getBoundingClientRect should trigger "contentvisibilityautostatechange" now.
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inner.getBoundingClientRect().height;
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await waitForAtLeastOneFrame();
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assert_equals(count, 1);
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dialog.close();
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}, "Contentvisibilityautostatechange fires once when c-v auto's dialog ancestor show()");
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</script>
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