css/css-cascade/unset-val-001.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>CSS Cascade: the "unset" value</title>
  <link rel="author" title="Chris Rebert" href="http://chrisrebert.com">
  <link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact">
  <link rel="help" href="http://www.w3.org/TR/css-cascade-3/#inherit-initial">
  <link rel="help" href="http://www.w3.org/TR/css-cascade-4/#inherit-initial">
  <link rel="match" href="reference/ref-filled-green-100px-square.xht">
  <meta name="assert" content="color:unset is the same as color:inherit since color is an inherited property. background-color:unset is the same as background-color:initial since background-color is a non-inherited property.">
  <style>
.square {
  width: 100px;
  height: 100px;
}
.under {
  background-color: green;
  margin-bottom: -100px;
}
.outer {
  color: green;
  background: red;
}
.inner {
  color: red;
  background-color: red;
  font-size: 40px;
  text-align: center;
}
.inner {
  color: unset;/* inherit from .outer */
  background-color: unset;/* initial, transparent, .under shows thru */
}
  </style>
</head>
<body>
  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>

  <div class="outer square">
    <div class="under square"></div>
    <div class="inner square">XX</div>
  </div>
</body>
</html>