55 lines
1.4 KiB
HTML
55 lines
1.4 KiB
HTML
<!doctype HTML>
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<html id=html>
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<meta charset="utf8">
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<title>Content Visibility: scroll position restoration</title>
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<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
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<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
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<meta name="assert" content="if an scroller is hidden via content-visibility and then shown again, its scroll offset should be restored">
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<meta name="viewport" content="width=device-width">
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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/helper.js"></script>
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<style>
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.scroller {
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width: 100px;
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height: 500px;
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overflow-y: scroll;
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}
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.spacer { height: 3000px; }
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.hidden { content-visibility: hidden; }
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</style>
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<div id=target class=scroller>
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<div class=spacer></div>
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</div>
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</style>
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<script>
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function removeHiddenAndScheduleTest(t) {
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target.classList.remove("hidden");
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requestAnimationFrame(() => {
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requestAnimationFrame(() => {
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testScrollTop(t);
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});
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});
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}
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function testScrollTop(t) {
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t.step(() => assert_equals(target.scrollTop, 2000));
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t.done();
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}
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async_test((t) => {
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target.scrollTop = 2000;
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target.classList.add("hidden");
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requestAnimationFrame(() => {
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requestAnimationFrame(() => {
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removeHiddenAndScheduleTest(t);
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});
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});
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}, "Scroll offset is restored when content-visibility hidden is removed");
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</script>
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</html>
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