File: focus-element-crash.html

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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="assert" content="focus element adopted or remounted shouldn't crash.">

<body>

<!--focus element remounted test case-->
<audio onloadstart="select.focus()" src=""></audio>
<iframe id="iframe"></iframe>
<table id="table">
    <td>
        <select id="select" onblur=";"></select>
    </td>
</table>
<script>
    window.addEventListener("load", _ => iframe.appendChild(table));
</script>

<!--focus element adopted test case-->
<input id="username" type="text" placeholder="username">
<input id="password" type="text" placeholder="password">
</body>
<script>
    let search = document.getElementById("search");
    let username = document.getElementById("username");
    username.focus();
    window.onload = () => document.adoptNode(username);
    username.addEventListener("blur", function (e) {
        document.body.append(`event:${e.type} fire.`)
    });
</script>
</html>