title: Advanced CSS Selector - Select based on styling
body: <p>Performance issues aside, is it possible to use a style as a selector? For example, something like:</p>
  
  <pre><code>div[background-image="img/someimg.jpg"] {opacity:.5}
  </code></pre>
  
  <p>My fallback plan is to use javascript and iterate over divs (adding a class when found), but this might end up being even <em>more</em> expensive given that the page is highly dynamic, and I'm not in control of the divs being added.</p>