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@@ -0,0 +1,72 @@
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+<!DOCTYPE html>
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+
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+<head>
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+ <style>
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+ #outer {
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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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+
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+ #inner {
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+ width: 100px;
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+ height: 100px;
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+ background-color: pink;
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+ }
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+ </style>
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+</head>
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+
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+<body>
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+ <div id="outer">
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+ <div id="inner"></div>
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+ </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 outerBox = document.getElementById("outer");
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+ const innerBox = document.getElementById("inner");
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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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+
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+ function createResizeObserverCallback() {
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+ let resolve;
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+ const promise = new Promise(r => {
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+ resolve = r;
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+ });
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+
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+ const callback = (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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+
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+ resolve();
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+ };
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+
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+ return { promise, callback };
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+ }
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+
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+ const { callback, promise } = createResizeObserverCallback();
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+
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+ const resizeObserver = new ResizeObserver(callback);
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+ resizeObserver.observe(innerBox);
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+ resizeObserver.observe(outerBox);
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+
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+ await promise;
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+
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+ resizeObserver.disconnect();
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+
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+ innerBox.style.width = "500px";
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+ outerBox.style.width = "600px";
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+
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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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+
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+ done();
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+ });
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+</script>
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Aliaksandr Kalenik