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<!DOCTYPE html>
<html>
<head>
<style>
/* Default CSS Values */
mark {
  background-color: yellow;
  color: black;
}
</style>
</head>
<body>
<p>A mark element is displayed like this:</p>
<mark>Highlighted text!!</mark>
<p>A customized mark element (changed background-color):</p>
<mark style="background-color:pink;">Highlighted text!!</mark>
</body>
</html>