74 lines
2 KiB
HTML
74 lines
2 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: 2000px; overflow-anchor: none; }
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#scroller { overflow: scroll; width: 500px; height: 300px; }
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.anchor {
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position:relative; height: 100px; width: 150px;
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background-color: #afa; border: 1px solid gray;
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}
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#forceScrolling { height: 500px; background-color: #fcc; }
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</style>
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<div id="outerChanger"></div>
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<div id="outerAnchor" class="anchor"></div>
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<div id="scroller">
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<div id="innerChanger"></div>
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<div id="innerAnchor" class="anchor"></div>
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<div id="forceScrolling"></div>
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</div>
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<script>
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// Tests that scroll anchoring can be disabled per-scroller with the
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// overflow-anchor property.
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var divScroller = document.querySelector("#scroller");
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var docScroller = document.scrollingElement;
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var innerChanger = document.querySelector("#innerChanger");
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var outerChanger = document.querySelector("#outerChanger");
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function setup() {
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divScroller.scrollTop = 100;
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docScroller.scrollTop = 100;
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innerChanger.style.height = "200px";
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outerChanger.style.height = "150px";
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}
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function reset() {
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document.body.style.overflowAnchor = "";
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divScroller.style.overflowAnchor = "";
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divScroller.scrollTop = 0;
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docScroller.scrollTop = 0;
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innerChanger.style.height = "";
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outerChanger.style.height = "";
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}
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test(() => {
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setup();
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assert_equals(divScroller.scrollTop, 300,
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"Scroll anchoring should apply to #scroller.");
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assert_equals(docScroller.scrollTop, 100,
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"Scroll anchoring should not apply to the document scroller.");
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reset();
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}, "Disabled on document, enabled on div.");
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test(() => {
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document.body.style.overflowAnchor = "auto";
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divScroller.style.overflowAnchor = "none";
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setup();
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assert_equals(divScroller.scrollTop, 100,
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"Scroll anchoring should not apply to #scroller.");
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assert_equals(docScroller.scrollTop, 250,
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"Scroll anchoring should apply to the document scroller.");
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reset();
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}, "Enabled on document, disabled on div.");
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</script>
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