<!DOCTYPE html> <html> <body> <iframe src="data:text/html,<body spellcheck=false>xx</body>"></iframe> <script> onload = function() { var i = document.querySelector("iframe"); var d = i.contentDocument; var w = i.contentWindow; d.designMode = "on"; i.focus(); d.body.focus(); w.getSelection().collapse(d.body.firstChild, 2); }; </script> </body> </html>