Plug-in CSS Chapter 5, Example 38 (Click on the icon to view the source for copy and pasting)
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      <title>Plug-in CSS: Example 38</title>
      <link rel='stylesheet' type='text/css' href='PC.css' />
      <script src='PJ.js'></script><script src='PC.js'></script>
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      A planet is a celestial body orbiting a star or stellar remnant that is
      massive enough to be rounded by<br />
      its own <span class='tooltipfade i'>gravity<span>Gravitation, or gravity,
      is one of the four<br />fundamental interactions of nature (along<br />
      with the strong force, electromagnetism<br />and the weak force)</span>
      </span>, is not massive enough to cause thermonuclear fusion, and (etc...)