67 lines
2 KiB
HTML
67 lines
2 KiB
HTML
<!DOCTYPE html>
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<meta name="viewport" content="width=device-width,initial-scale=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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<script src="./resources/intersection-observer-test-utils.js"></script>
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<style>
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pre, #log {
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position: absolute;
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top: 0;
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left: 200px;
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}
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#root {
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width: 200px;
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height: 200px;
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overflow: visible;
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}
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#target {
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background-color: green;
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}
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</style>
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<div id="root">
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<div id="target" style="width: 100px; height: 100px; transform: translateY(250px)"></div>
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</div>
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<script>
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var entries = [];
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runTestCycle(function() {
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var root = document.getElementById('root');
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assert_true(!!root, "root element exists.");
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var target = document.getElementById('target');
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assert_true(!!target, "target element exists.");
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var observer = new IntersectionObserver(function(changes) {
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entries = entries.concat(changes);
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}, { root: root });
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observer.observe(target);
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entries = entries.concat(observer.takeRecords());
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assert_equals(entries.length, 0, "No initial notifications.");
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runTestCycle(step0, "First rAF.");
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}, "IntersectionObserver should detect and report edge-adjacent and zero-area intersections.");
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function step0() {
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runTestCycle(step1, "Set transform=translateY(200px) on target.");
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checkLastEntry(entries, 0, [8, 108, 258, 358, 0, 0, 0, 0, 8, 208, 8, 208, false]);
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target.style.transform = "translateY(200px)";
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}
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function step1() {
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runTestCycle(step2, "Set transform=translateY(201px) on target.");
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checkLastEntry(entries, 1, [8, 108, 208, 308, 8, 108, 208, 208, 8, 208, 8, 208, true]);
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target.style.transform = "translateY(201px)";
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}
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function step2() {
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runTestCycle(step3, "Set transform=translateY(185px) on target.");
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checkLastEntry(entries, 2);
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target.style.height = "0px";
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target.style.width = "300px";
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target.style.transform = "translateY(185px)";
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}
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function step3() {
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checkLastEntry(entries, 3, [8, 308, 193, 193, 8, 208, 193, 193, 8, 208, 8, 208, true]);
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}
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</script>
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