зеркало из https://github.com/mozilla/gecko-dev.git
40 строки
1.1 KiB
HTML
40 строки
1.1 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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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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#target {
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width: 0px;
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height: 0px;
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}
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</style>
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<div id='target'></div>
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<script>
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var entries = [];
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runTestCycle(function() {
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var target = document.getElementById('target');
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assert_true(!!target, "target exists");
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var observer = new IntersectionObserver(function(changes) {
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entries = entries.concat(changes)
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});
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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 should generate a notification.");
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}, "Ensure that a zero-area target intersecting root generates a notification with intersectionRatio == 1");
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function step0() {
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assert_equals(entries.length, 1, "One notification.");
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assert_equals(entries[0].intersectionRatio, 1, "intersectionRatio == 1");
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}
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</script>
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