<!DOCTYPE html> <html> <head> <style> span { color: green } :default:checked + span { color: red } input { display: none } </style> </head> <body> <form> <div> <input type="submit"> <input type="radio" checked="checked" id="foo"> <span>There should be no red</span> </div> </form> <script> var foo = document.body.offsetWidth; document.getElementById("foo").setAttribute("type", "submit"); </script> </body> </html>