test.html | Explore in Territory

<html>
  <style>
    #author, #user, #none {
      color: red;
    }
  </style>
  <div id="author" style="background-color: black !important">
    Hello.
  </div>
  <div id="user" style="background-color: black !important">
    Hello.
  </div>
  <div id="none" style="background-color: black !important">
    Hello.
  </div>
</html>

chromium/chrome/test/data/extensions/api_test/executescript/css_origin/test.html