83 lines
2.3 KiB
HTML
83 lines
2.3 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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display: inline-block;
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overflow-y: scroll;
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height: 200px;
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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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background-color: green;
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}
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.spacer {
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height: 300px;
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}
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</style>
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<div id="root">
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<div id="leading-space" class="spacer"></div>
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<div id="target"></div>
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<div id="trailing-space" class="spacer"</div>
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</div>
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<script>
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var entries = [];
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var root, target, trailingSpace;
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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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trailingSpace = document.getElementById("trailing-space");
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assert_true(!!trailingSpace, "TrailingSpace 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});
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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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}, "Verify that not-intersecting notifications are sent when a target is removed from the DOM tree.");
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function step0() {
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root.scrollTop = 150;
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runTestCycle(step1, "root.scrollTop = 150");
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checkLastEntry(entries, 0, [11, 111, 311, 411, 0, 0, 0, 0, 11, 111, 11, 211, false]);
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}
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function step1() {
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root.removeChild(target);
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runTestCycle(step2, "root.removeChild(target).");
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checkLastEntry(entries, 1, [11, 111, 161, 261, 11, 111, 161, 211, 11, 111, 11, 211, true]);
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}
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function step2() {
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root.scrollTop = 0;
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root.insertBefore(target, trailingSpace);
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runTestCycle(step3, "root.insertBefore(target, trailingSpace).");
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checkLastEntry(entries, 2, [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, false]);
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}
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function step3() {
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root.scrollTop = 150;
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runTestCycle(step4, "root.scrollTop = 150 after reinserting target.");
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checkLastEntry(entries, 2);
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}
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function step4() {
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checkLastEntry(entries, 3, [11, 111, 161, 261, 11, 111, 161, 211, 11, 111, 11, 211, true]);
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}
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</script>
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