HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS lang |= vs ^= Example</title>
  <style>
    /* Matches en, en-US, en-GB — not "english" */
    [lang|="en"] {
      outline: 2px solid #2563eb;
      padding: 0.35rem 0.5rem;
      border-radius: 4px;
      margin-bottom: 0.5rem;
    }

    /* Also matches lang="english" */
    [lang^="en"] {
      background: #fef9c3;
      padding: 0.35rem 0.5rem;
      border-radius: 4px;
      margin-bottom: 0.5rem;
    }
  </style>
</head>
<body>
  <h1>|= vs ^= for lang</h1>
  <p lang="en-US">en-US — matched by |= (blue outline)</p>
  <p lang="english">english — matched by ^= only (yellow background)</p>
  <p lang="fr">fr — not matched by either rule</p>
</body>
</html>

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CSS [attribute|=value] - |= vs ^= Comparison