title: Javascript, CSS: Get element by style attribute
body: <p>I'd like to:</p>
  
  <ol>
  <li>Find a style attribute for all elements in the page (for instance: all elements that have <code>color:#333;</code>)</li>
  <li>Change this attribute for all of them (for instance from <code>color:#333</code> to <code>color:#444</code>).</li>
  </ol>
  
  <p>Do you have any suggestion on doing so?</p>