<!DOCTYPE html><html><head>
  <title>:active pseudo-class on controls</title>
  <style type="text/css">button:active { background: green; color: white; }</style>
  <link rel="author" title="Ian Hickson" href="mailto:ian@hixie.ch">
  <link rel="help" href="https://www.w3.org/TR/css3-selectors/#selectors"> <!-- bogus link to make sure it gets found -->
  <meta name="flags" content=" interact">
 </head>
 <body>
<p><button>Activating (e.g. holding the mouse button down on) this button should make it go green.</button></p>

</body></html>