HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>content: attr()</title>
  <style>
    p::before {
      content: attr(data-label) ": ";
      font-weight: bold;
    }
  </style>
</head>
<body>
  <p data-label="Tip">Save often while you code.</p>
</body>
</html>

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CSS content Property — attr()