forked from mirrors/gecko-dev
89aab60c4b
Automatic update from web-platform-tests blink: adds test for overflow-clip-margin and intersection observer This verifies intersection observer properly reflects overflow-clip-margin on an ancestor. BUG=1157843 TEST=test only change Change-Id: I9c9839294df8ffb88b42947aa87c7cc5222f5a6d Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593812 Reviewed-by: Stefan Zager <szager@chromium.org> Reviewed-by: vmpstr <vmpstr@chromium.org> Commit-Queue: Scott Violet <sky@chromium.org> Cr-Commit-Position: refs/heads/master@{#838232} -- wpt-commits: 7e7eb272d56b9e1f9f2b7336c03ada50b584b45c wpt-pr: 26908
55 lines
1.8 KiB
HTML
55 lines
1.8 KiB
HTML
<!doctype html>
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<meta charset="utf-8">
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<title>Overflow: intersection observer with overflow-clip-margin</title>
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<link rel="help" href="https://www.w3.org/TR/css-overflow-3/#propdef-overflow-clip-margin">
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<link rel="author" title="Scott Violet" href="mailto:sky@chromium.org">
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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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#clipped_container {
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overflow: clip;
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width: 100px;
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height: 100px;
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border: solid;
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overflow-clip-margin: 50px;
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}
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#big_green_div {
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position: relative;
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width: 1000px;
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height: 1000px;
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background: green;
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left: -200px;
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top: -200px;
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}
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/* These values ensure the element is vertically offscreen. */
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.spacer { width: 150px; height: calc(100vh + 10px); }
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</style>
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<div class="spacer"></div>
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<div id="clipped_container">
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<div id="big_green_div"></div>
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</div>
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<script>
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let t = async_test("ParentWithOverflowClipMargin");
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let options = {
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threshold: 0,
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rootMargin: '0px'
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}
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// The 'big_green_div' is initially on screen due to
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// overflow-clip-margin of the parent. Once the observer is notified, the
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// overflow-clip-margin is reduced so that 'big_green_div' is no longer
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// on screen, and the observer should again be notified.
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let gotIntersects = false;
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let intersectionObserver = new IntersectionObserver((entries, observer) => {
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t.step(function() { assert_equals(1, entries.length); });
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let entry = entries[0];
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if (!gotIntersects) {
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t.step(function() { assert_true(entry.isIntersecting); });
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gotIntersects = true;
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document.getElementById('clipped_container').style.overflowClipMargin = "0px";
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} else {
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t.step(function() { assert_false(entry.isIntersecting); });
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t.done();
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}}, options);
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intersectionObserver.observe(document.getElementById('big_green_div'));
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</script>
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