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  <title>:active pseudo-class on controls</title>
  <style type="text/css"><![CDATA[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" />
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<p><button>Activating (e.g. holding the mouse button down on) this button should make it go green.</button></p>
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