HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>CSS text-underline-position Compare</title>

  <style>

    body {

      font-family: system-ui, sans-serif;

      padding: 20px;

      background: #f8fafc;

      color: #334155;

    }



    .auto-line {

      text-decoration: underline;

      text-underline-position: auto;

    }



    .under-line {

      text-decoration: underline;

      text-underline-position: under;

    }



    p {

      margin: 0 0 1rem;

    }

  </style>

</head>

<body>

  <h1>Position Comparison</h1>

  <p class="auto-line">auto — Typography with jumping glyphs and descenders</p>

  <p class="under-line">under — Typography with jumping glyphs and descenders</p>

</body>

</html>

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CSS text-underline-position Property - auto vs under