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<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="../lib/w3.css">
<body class="w3-container">

<p class="w3-tooltip">Hover over me!
<span class="w3-text w3-tag">Tooltip content</span></p>

</body>
</html>