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Test Info:
<head>
<script>
document.designMode = "on";
Promise.all([
new Promise(resolve => addEventListener("load", resolve)),
new Promise(resolve => addEventListener("focus", resolve)),
]).then(() => {
document.body.firstChild.data = "";
document.documentElement.removeAttribute("class");
});
blur();
focus();
getSelection().collapse(document.body, 0);
</script>
</head>
<body><![CDATA[ CDATA ]]></body>
</html>