<!DOCTYPE html>

<head>
    <style>
        #box {
            width: 100px;
            height: 200px;
            background-color: lightblue;
            border: 10px solid pink;
            padding: 10px;
        }
    </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 P