HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Mark Basic Example</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}mark{background:#fef08a;color:#0f172a;padding:.1rem .2rem;border-radius:3px}</style>
</head>
<body>
  <h1>Basic mark Highlight</h1>
  <p>This paragraph contains some <mark>important</mark> information.</p>
</body>
</html>

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HTML mark Tag — Highlight Important Text