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45 lines
1.3 KiB
HTML
45 lines
1.3 KiB
HTML
<!DOCTYPE html>
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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: 4000px }
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#A, #B { width: 100px; background-color: #afa; }
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#B { height: 100px; }
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#inner { width: 100px; height: 100px; background-color: pink; }
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#A { overflow-anchor: none; }
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</style>
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<div id="changer1"></div>
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<div id="A">
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<div id="inner"></div>
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<div id="changer2"></div>
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</div>
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<div id="B"></div>
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<script>
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// Tests that an element with overflow-anchor: none is excluded, along with its
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// DOM descendants, from the anchor selection algorithm.
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test(() => {
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var changer1 = document.querySelector("#changer1");
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var changer2 = document.querySelector("#changer2");
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document.scrollingElement.scrollTop = 50;
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changer1.style.height = "100px";
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changer2.style.height = "50px";
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// We should anchor to #B, not #A or #inner, despite them being visible.
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assert_equals(document.scrollingElement.scrollTop, 200);
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document.querySelector("#A").style.overflowAnchor = "auto";
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document.scrollingElement.scrollTop = 150;
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changer1.style.height = "200px";
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changer2.style.height = "100px";
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// We should now anchor to #inner, which is moved only by #changer1.
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assert_equals(document.scrollingElement.scrollTop, 250);
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}, "Subtree exclusion with overflow-anchor.");
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</script>
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