css/css-values/reference/ch-unit-008-ref.html

<!DOCTYPE html>

  <meta charset="UTF-8">

  <title>CSS Values and Units Test Reference File</title>

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

  <style>
  div
    {
      float: left;
      font-size: 80px; /* arbitrary font size */
      line-height: 1.8; /* arbitrary line-height */
    }

  div#blue
    {
      background-color: blue;
      color: blue;
    }

  div#orange
    {
      background-color: orange;
      color: orange;
      clear: left;
    }
  </style>

  <p>Test passes if there is a blue rectangle with the <strong>same width</strong> as an orange rectangle.

  <div id="blue">00000</div>

  <div id="orange">00000</div>