70 lines
2.2 KiB
HTML
70 lines
2.2 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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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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iframe {
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width: 100px;
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height: 100px;
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border: 0;
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}
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#text-shadow {
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display: inline-block;
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font-size: 144px;
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font-weight: 1000;
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color: rgba(0, 0, 0, 0);
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text-shadow: -100px 0 0 rgba(255, 0, 0, .7);
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}
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</style>
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<iframe id=target srcdoc="<!DOCTYPE html><div>Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum.</div>"></iframe><div id=text-shadow>O</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("text-shadow");
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assert_true(!!target, "target exists");
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assert_true(!!occluder, "occluder exists");
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let 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 observing an iframe element.", delay);
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function step0() {
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occluder.style.textShadow = "none";
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runTestCycle(step1, 'occluder.style.textShadow = "none"', delay);
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assert_equals(entries.length, 1, "Initial notification.");
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assert_equals(entries[0].isVisible, false, "Initially occluded.");
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}
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function step1() {
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occluder.style.textShadow = "";
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runTestCycle(step2, 'occluder.style.textShadow = ""', delay);
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assert_equals(entries.length, 2, "Notification after removing text shadow.");
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assert_equals(entries[1].isVisible, true, "Visible when text shadow removed.");
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}
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function step2() {
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assert_equals(entries.length, 3, "Notification after re-adding text shadow.");
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assert_equals(entries[2].isVisible, false, "Occluded when text shadow re-added.");
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}
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</script>
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