css/css-cascade/important-prop.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>CSS Cascade: Important</title>
  <link rel="author" title="David Burns" href="http://www.theautomatedtester.co.uk">
  <link rel="help" href="https://drafts.csswg.org/css-cascade/#importance">
  <link rel="match" href="important-prop-ref.html">
  <meta name="flags" content="">
  <style>
  @keyframes override{
   from, to{background-color: #f00;}
  }

  .square {
    color:#00f;
    animation: override 1s infinite;
    width: 100px;
    height: 100px;
  }
  .green {
    background-color:green !important;
  }
  </style>
</head>
<body>
  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>

  <div class="square green"></div>

</body>
</html>