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2866d20a40
This commit adds two tests around anchor selection. The first tests that 'position: sticky' is an invalid subtree, which is new to the spec. The second tests that implementations respect 'overflow-anchor' on the table element, and don't get confused with the boxes generated by tables. Differential Revision: https://phabricator.services.mozilla.com/D16274 --HG-- extra : rebase_source : 3c2e74a5765d3409a57aa892fe20aa208c5c0e84 extra : intermediate-source : 55addc12904b79f7300e47da96b1d33780a4cbfb extra : source : 306393539feb1a3391c3a03baaee43e7058bc44a
28 lines
905 B
HTML
28 lines
905 B
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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body { height: 400vh; margin: 0; }
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#sticky, #content { width: 200px; height: 100px; }
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#sticky { position: sticky; left: 100px; top: 50px; }
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#before { height: 50px; }
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#content { margin-top: 100px; }
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</style>
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<div id="sticky">sticky</div>
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<div id="before"></div>
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<div id="content">content</div>
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<script>
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// Tests that the anchor selection algorithm skips sticky-positioned elements.
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test(() => {
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document.scrollingElement.scrollTop = 150;
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document.querySelector("#before").style.height = "100px";
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assert_equals(document.scrollingElement.scrollTop, 200);
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}, "Sticky-positioned headers shouldn't be chosen as scroll anchors (we should use 'content' instead)");
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</script>
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