title: Why are CSS styles greyed out in Chrome Developer Tools?
body: <p>I often use developer tools to test live CSS changes but today I am seeing for the first time that the styles section on a page I'm looking at is greyed out (the background is grey, not the text) and un-editable. I only have the option to revise a specific, singular element's style and not groups of elements. </p>
  
  <p>What causes this to happen?</p>