title: Why isn't 'lightblue' a valid CSS color?
body: <p>When I write </p>
  
  <pre><code>background-color:lightblue;
  </code></pre>
  
  <p>In IntelliJ, it highlights <code>lightblue</code> and suggests I replace it with <code>#add8e6</code>.</p>
  
  <p>I rather like lightblue, it's much more readable. Was it "banned" from the specs? Should I do as IntelliJ suggests?</p>