61 lines
1.5 KiB
HTML
61 lines
1.5 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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.spacer {
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height: calc(100vh + 100px);
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}
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#root {
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display: inline-block;
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overflow-y: scroll;
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height: 240px;
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border: 3px solid black;
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}
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#target {
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width: 100px;
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height: 100px;
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margin: 200px 0 0 0;
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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"></div>
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</div>
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<script>
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var entries = [];
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var root, target;
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runTestCycle(function() {
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target = document.getElementById("target");
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assert_true(!!target, "target exists");
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root = document.getElementById("root");
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assert_true(!!root, "root 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, threshold: [0.5] });
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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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}, "First observation with a threshold.");
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function step0() {
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root.scrollTop = 20;
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runTestCycle(step1, "root.scrollTop = 20");
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checkLastEntry(entries, 0, [ 11, 111, 211, 311, 11, 111, 211, 251, 11, 111, 11, 251, false]);
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}
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function step1() {
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checkLastEntry(entries, 1, [ 11, 111, 191, 291, 11, 111, 191, 251, 11, 111, 11, 251, true]);
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}
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</script>
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