<html>
<head>
<script>
function testonload() {
    if (window.testRunner)
        testRunner.dumpAsText();

    caretrange = document.caretRangeFromPoint();
    button.style.setProperty("content", "url()");
    button.autofocus = true;
    caretrange.surroundContents(textarea);
}
function togglehandler() {
    textarea.selectionStart = 0;
}
</script>
</head>
<body onload=testonload()>This tests that we do not hit an assertion while unfocusing.
<textarea id="textarea">PASS</textarea>
<details ontoggle="togglehandler()" open="true">
<img src="empty"></img>
<button id="button"></button>
</details>
</body>
</html>