<!DOCTYPE html> <html> <head> <script type="text/javascript"> function doTest() { document.getSelection().selectAllChildren(document.body); var editor = document.getElementById("editor"); var editorBody = editor.contentDocument.body; editor.contentDocument.getSelection().selectAllChildren(editorBody); } </script> </head> <body> <p id="text">normal text</p> <div>content editable</div> <iframe id="editor" onload="doTest();" src="data:text/html,<body>editable text</body>"></iframe> </body> </html>