<!DOCTYPE html> <html> <body> <div style="position: absolute"> <iframe src="data:text/html,<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>