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  <title>vertical-align sub and super</title>

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    body {

      font-family: Georgia, serif;

      padding: 24px;

      background: #fff;

      color: #1e293b;

      font-size: 1.125rem;

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    .sub {

      vertical-align: sub;

      font-size: 0.75em;

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    .super {

      vertical-align: super;

      font-size: 0.75em;

    }

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  <h1>Subscript and Superscript</h1>

  <p>Water formula: H<span class="sub">2</span>O</p>

  <p>E = mc<span class="super">2</span></p>

  <p>See note<span class="super">1</span> for details.</p>

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CSS vertical-align Property - Sub and Super