gecko/editor/reftests/caret_on_presshell_reinit.html

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<!DOCTYPE html>
<html>
<body>
<div>
<iframe src="data:text/html,<body contenteditable>foo</body>"></iframe>
</div>
<script type="text/javascript">
onload = function() {
var div = document.querySelector("div");
div.style.position = "absolute";
document.body.clientWidth;
var iframe = document.querySelector("iframe");
var win = iframe.contentWindow;
var body = win.document.body;
iframe.focus();
body.focus();
var sel = win.getSelection();
sel.collapse(body.firstChild, 0);
};
</script>
</body>
</html>