<!DOCTYPE html>
<html>
<body>
<div style="position: absolute">
<iframe srcdoc="<body contenteditable>foo</body>"></iframe>
</div>
<script type="text/javascript">
onload = function() {
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>