51 lines
1.3 KiB
HTML
51 lines
1.3 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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.spacer {
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height: calc(100vh + 100px);
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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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</style>
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<div class="spacer"></div>
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<div id="target"></div>
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<div class="spacer"></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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function createObserver() {
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new IntersectionObserver(function(changes) {
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entries = entries.concat(changes)
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}).observe(target);
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}
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createObserver();
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runTestCycle(step0, "First rAF");
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}, "IntersectionObserver that is unreachable in js should still generate notifications.");
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function step0() {
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document.scrollingElement.scrollTop = 300;
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runTestCycle(step1, "document.scrollingElement.scrollTop = 300");
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assert_equals(entries.length, 1, "One notification.");
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}
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function step1() {
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document.scrollingElement.scrollTop = 0;
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assert_equals(entries.length, 2, "Two notifications.");
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}
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</script>
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