<!DOCTYPE html> <html class="reftest-wait"> <head> <style> #x { color: orange; } #x { color: green; } </style> </head> <body onload="getComputedStyle(document.getElementById('x')).color; document.styleSheets[0].cssRules[0].style.setProperty('color', 'orange', 'important'); document.documentElement.removeAttribute('class');"> <div id="x"><span>I should be orange</span></div> </body> </html>