HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>id — CSS and labels</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}#hero-title{color:#1d4ed8;margin:0 0 1rem;font-size:1.125rem}label{display:block;margin-bottom:.35rem;font-size:.875rem;font-weight:500}#username{display:block;width:100%;max-width:280px;font:inherit;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1 id=hero-title>Styled with #hero-title</h1>

  <label for=username>Username</label>
  <input id=username name=username autocomplete=username>

  <p class=hint>CSS uses <code>#hero-title</code> to target the id. <code>&lt;label for="username"&gt;</code> links to <code>id="username"</code>.</p>
</body>
</html>

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HTML id Attribute — CSS & Label Targeting