62 lines
1.7 KiB
HTML
62 lines
1.7 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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<script src="../resources/intersection-observer-test-utils.js"></script>
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<style>
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body, html {
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margin: 0;
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}
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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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.testdiv {
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font-size: 24px;
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}
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</style>
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<div class="testdiv">This is the <span id="target">target</span>.</div>
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<div class="testdiv" id="occluder">This is the occluder.</div>
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<script>
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var delay = 100;
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var entries = [];
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var target;
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var occluder;
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runTestCycle(function() {
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target = document.getElementById("target");
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occluder = document.getElementById("occluder");
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assert_true(!!target, "target exists");
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assert_true(!!occluder, "occluder exists");
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var observer = new IntersectionObserver(function(changes) {
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entries = entries.concat(changes)
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}, {trackVisibility: true, delay: delay});
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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.", delay);
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}, "IntersectionObserverV2 in a single document using the implicit root, with an occluding element.", delay);
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function step0() {
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occluder.style.marginTop = "-10px";
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runTestCycle(step1, "occluder.style.marginTop = '-10px'", delay);
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assert_equals(entries.length, 1);
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assert_true(entries[0].isVisible);
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}
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function step1() {
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// Occluding elements with opacity=0 should not affect target visibility.
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occluder.style.opacity = "0";
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runTestCycle(step2, "occluder.style.opacity = 0", delay);
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assert_equals(entries.length, 2);
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assert_false(entries[1].isVisible);
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}
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function step2() {
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assert_equals(entries.length, 3);
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assert_true(entries[2].isVisible);
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}
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</script>
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