52 lines
1.8 KiB
HTML
52 lines
1.8 KiB
HTML
<!doctype html>
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<title>CSSOM View - scrollIntoView aligns scrollport-covering child in both inline and block directions.</title>
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<meta charset="utf-8">
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<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview">
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<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1497677">
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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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#scroller {
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width: 200px;
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height: 200px;
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background-color: purple;
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overflow: hidden;
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position: relative;
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}
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#child {
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width: 400px;
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height: 400px;
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background-color: green;
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position: absolute;
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left: 0px;
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top: 0px;
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}
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</style>
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<div id="scroller">
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<div id="space" style="height:400%; width: 400%"></div>
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<div id="child"></div>
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</div>
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<script>
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const scroller = document.getElementById("scroller");
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const child = document.getElementById("child");
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function test_alignment(alignment, start_offset, expected_offset) {
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scroller.scrollTop = start_offset.top;
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scroller.scrollLeft = start_offset.left;
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child.scrollIntoView({block: alignment, inline: alignment});
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assert_equals(scroller.scrollTop, expected_offset.top,
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`${alignment} sets top`);
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assert_equals(scroller.scrollLeft, expected_offset.left,
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`${alignment} sets left`);
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}
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test(function() {
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// child, being positioned at (0, 0) and having size 400 x 400 covers the
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// scrollport at scroll offsets (0,0) and (100, 100).
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test_alignment("start", {top: 100, left: 100}, {top: 0, left: 0});
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test_alignment("center", {top: 0, left: 0}, {top: 100, left: 100});
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test_alignment("end", {top: 100, left: 100}, {top: 200, left: 200});
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}, "scrollIntoView scrolls scrollport-covering child in both axes");
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</script>
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