100 lines
2.5 KiB
HTML
100 lines
2.5 KiB
HTML
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<!DOCTYPE HTML>
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<html>
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<head>
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<script src="../resources/js-test-pre.js"></script>
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<style>
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#scrollable {
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width: 100px;
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height: 100px;
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border: 1px solid black;
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overflow-y: auto;
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}
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#container {
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width: 100px;
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height: 200px;
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}
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#box {
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position: relative;
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top: 100px;
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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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</head>
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<body>
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<div id="scrollable">
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<div id="container">
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<div id="box"></div>
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</div>
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</div>
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<script>
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var animateTimestamp = 0;
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var intersectTimestamp = 0;
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var MaxFrames = 2;
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var currentFrame = 0;
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function scrollBox()
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{
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var scrollable = document.querySelector("#scrollable");
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var height = scrollable.clientHeight;
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scrollable.scroll(0, (height / MaxFrames) * currentFrame);
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document.body.offsetHeight;
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}
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function handleAnimate(timestamp)
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{
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if (++currentFrame > MaxFrames) {
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finishJSTest();
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return;
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}
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animateTimestamp = timestamp;
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scrollBox();
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requestAnimationFrame(handleAnimate);
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}
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function handleIntersect(entries, observer)
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{
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entries.forEach((entry) => {
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intersectTimestamp = entry.time;
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shouldBe("Math.round(animateTimestamp)", "Math.round(intersectTimestamp)");
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});
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}
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function buildThresholdList()
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{
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let thresholds = [];
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for (let i = 1.0; i <= MaxFrames; i++) {
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let ratio = i / MaxFrames;
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thresholds.push(ratio);
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}
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return thresholds;
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}
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function createObserver()
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{
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let observer;
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let options = {
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root: document.querySelector("#scrollable"),
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rootMargin: "0px",
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threshold: buildThresholdList()
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};
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observer = new IntersectionObserver(handleIntersect, options);
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observer.observe(document.querySelector("#box"));
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}
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window.jsTestIsAsync = true;
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description("Test the IntersectionObserver timestamp is the same as the timestamp of the rAF callback.");
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createObserver();
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requestAnimationFrame(handleAnimate);
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</script>
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<script src="../resources/js-test-post.js"></script>
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</body>
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</html>
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