<!DOCTYPE html> <html> <head> <style> span { color: red } :checked + span { color: green } input { display: none } </style> <body onload='document.getElementById("foo").setAttribute("type", "checkbox"); document.getElementById("bar").setAttribute("type", "radio")'> <input checked="checked" id="foo"><span>There should be no red</span> <input checked="checked" id="bar"><span>There should be no red</span> </body> </html>