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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>Basic Underline Example</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7;font-size:.95rem}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}.note{margin-top:1rem;background:#eff6ff;border:1px solid #93c5fd;border-radius:8px;padding:.75rem 1rem;font-size:.875rem;color:#1e40af;max-width:420px}</style>

</head>

<body>

  <h1>Basic Underline</h1>

  <p>This is an <u>important</u> message.</p>

  <p class=note>In HTML5, use &lt;u&gt; for unarticulated annotations — not general emphasis. Prefer &lt;em&gt; or &lt;strong&gt; for stress.</p>

</body>

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HTML u Tag — Basic Underlining