зеркало из https://github.com/mozilla/gecko-dev.git
64 строки
1.9 KiB
HTML
64 строки
1.9 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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</style>
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<div class="spacer"></div>
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<br id="target">
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<div class="spacer"></div>
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<script>
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var vw = document.documentElement.clientWidth;
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var vh = document.documentElement.clientHeight;
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var entries = [];
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var target;
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var tw, th;
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runTestCycle(function() {
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target = document.getElementById("target");
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let target_rect = target.getBoundingClientRect();
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tw = target_rect.width;
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th = target_rect.height;
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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.");
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}, "IntersectionObserver observing a br element.");
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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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// The numbers in brackets are target client rect; intersection rect;
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// and root bounds.
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checkLastEntry(entries, 0, [8, 8 + tw, vh + 108, vh + 108 + th, 0, 0, 0, 0, 0, vw, 0, vh, false]);
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}
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function step1() {
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document.scrollingElement.scrollTop = 100;
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runTestCycle(step2, "document.scrollingElement.scrollTop = 100");
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checkLastEntry(entries, 1, [8, 8 + tw, vh - 192, vh - 192 + th, 8, 8 + tw, vh - 192, vh - 192 + th, 0, vw, 0, vh, true]);
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}
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function step2() {
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document.scrollingElement.scrollTop = 0;
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checkLastEntry(entries, 2, [8, 8 + tw, vh + 8, vh + 8 + th, 0, 0, 0, 0, 0, vw, 0, vh, false]);
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}
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</script>
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