minerva/Tests/LibWeb/Text/input/ResizeObserver/notify-if-parent-is-removed.html at master

ErisCyan / minerva

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minerva / Tests / LibWeb / Text / input / ResizeObserver / notify-if-parent-is-removed.html

minerva on 13 Jul 1 KB Initial commit

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<!DOCTYPE html>
<head>
    <style>
        #box {
            width: 200px;
            height: 200px;
            background-color: lightblue;
        }
    </style>
</head>
<body>
    <div><div id="box"></div></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;
            });
        }

        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;

        box.parentElement.remove();

        observerCallbackInvocation = createResizeObserverPromise();
        await observerCallbackInvocation;

        done();
    });
</script>