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chromium/third_party/blink/web_tests/external/wpt/css/css-break/reference/widows-001-ref.html 

<!DOCTYPE html>

  <meta charset="UTF-8">

  <title>CSS Reftest Reference</title>

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">

  <!--
  Date created: November 7th 2020
  Last modified: November 17th 2020
  -->

  <style>
  div
    {
      border: orange solid 4px;
      font-size: 20px;
      line-height: 1.3; /* computes to 26px */
      height: 104px; /* Therefore, exactly 4 line boxes */
      margin-bottom: 1em;
      padding: 0.5em; /* computes to 10px */
      width: 490px;

      columns: 3 auto;
      column-fill: auto;
      column-gap: 1em; /* computes to 20px */
      column-rule: blue solid 4px;

      widows: 1;
    }
  </style>

   <p>Test passes if the digits inside both orange-bordered rectangles are <strong>distributed identically</strong>.

  <div>1<br>2<br>3<br>4<br>5<br>6<br>7<br><br>8<br>9</div>

  <div>1<br>2<br>3<br>4<br>5<br>6<br>7<br><br>8<br>9</div>