HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>word-break: break-word</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .note {
      padding: 8px 12px;
      background: #fef3c7;
      border: 1px solid #f59e0b;
    }

    .box {
      width: 160px;
      margin: 0;
      padding: 8px;
      border: 1px solid #334155;
      word-break: break-word;
      font-size: 14px;
      line-height: 1.4;
    }
  </style>
</head>
<body>
  <p class="note"><strong>Deprecated.</strong> Prefer <code>overflow-wrap: anywhere</code> for new styles.</p>
  <p>Narrow box with legacy <strong>word-break: break-word</strong>.</p>
  <p class="box">Thisisaverylongwordthathasnospace</p>
</body>
</html>

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CSS word-break Property — break-word