title: Uncaught TypeError: Failed to execute 'insertRule' on 'CSSStyleSheet': 2 arguments required, but only 1 present
body: <p>Latest version of Google Chrome &amp; Opera are throwing this error:</p>
  
  <blockquote>
    <p>Uncaught TypeError: Failed to execute 'insertRule' on 'CSSStyleSheet': 2 arguments required, but only 1 present.</p>
  </blockquote>
  
  <p>Any ideas where this new bug is coming from and how to fix?</p>