CSS :defined Pseudo Class - Playground Example

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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
/* Selects any defined element */
:defined {
  font-style: italic;
}

/* Selects any instance of a specific custom element */
p:defined {
  color: red;
}
</style>
</head>
<body>
Example of :defined pseudo class.

<p>Example of text in &lt;p&gt; tags</p>
</body>
</html>

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