mirror of
https://github.com/RGBCube/serenity
synced 2025-05-15 23:54:57 +00:00
55 lines
1.4 KiB
HTML
55 lines
1.4 KiB
HTML
<!DOCTYPE html>
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<head>
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<style>
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#box {
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width: 200px;
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height: 200px;
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background-color: lightblue;
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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="box"></div>
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</body>
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<script src="../include.js"></script>
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<script>
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asyncTest(async done => {
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const box = document.getElementById("box");
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let resolve = null;
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function createResizeObserverPromise() {
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return new Promise(r => {
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resolve = r;
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});
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}
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function createTimeoutPromise(timeout) {
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return new Promise(r => {
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setTimeout(r, timeout);
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});
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}
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const resizeObserver = new ResizeObserver(entries => {
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for (let entry of entries) {
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const { width, height } = entry.contentRect;
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println(`Size changed: ${width}px x ${height}px`);
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}
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if (resolve) resolve();
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});
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let observerCallbackInvocation = createResizeObserverPromise();
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resizeObserver.observe(box);
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await observerCallbackInvocation;
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resizeObserver.unobserve(box);
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box.style.width = "400px";
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box.style.height = "400px";
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// Let event loop run to ensure that observer callback is not invoked.
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await createTimeoutPromise(0);
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done();
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});
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</script>
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