mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 14:42:44 +00:00
55 lines
1.4 KiB
HTML
55 lines
1.4 KiB
HTML
<!DOCTYPE html>
|
|
<head>
|
|
<style>
|
|
#box {
|
|
width: 200px;
|
|
height: 200px;
|
|
background-color: lightblue;
|
|
}
|
|
</style>
|
|
</head>
|
|
<body>
|
|
<div id="box"></div>
|
|
</body>
|
|
<script src="../include.js"></script>
|
|
<script>
|
|
asyncTest(async done => {
|
|
const box = document.getElementById("box");
|
|
|
|
let resolve = null;
|
|
function createResizeObserverPromise() {
|
|
return new Promise(r => {
|
|
resolve = r;
|
|
});
|
|
}
|
|
|
|
function createTimeoutPromise(timeout) {
|
|
return new Promise(r => {
|
|
setTimeout(r, timeout);
|
|
});
|
|
}
|
|
|
|
const resizeObserver = new ResizeObserver(entries => {
|
|
for (let entry of entries) {
|
|
const { width, height } = entry.contentRect;
|
|
println(`Size changed: ${width}px x ${height}px`);
|
|
}
|
|
|
|
if (resolve) resolve();
|
|
});
|
|
|
|
let observerCallbackInvocation = createResizeObserverPromise();
|
|
resizeObserver.observe(box);
|
|
await observerCallbackInvocation;
|
|
|
|
resizeObserver.unobserve(box);
|
|
|
|
box.style.width = "400px";
|
|
box.style.height = "400px";
|
|
|
|
// Let event loop run to ensure that observer callback is not invoked.
|
|
await createTimeoutPromise(0);
|
|
|
|
done();
|
|
});
|
|
</script>
|