title: Is there any way to have a customizable class element in html that a css file can extract custom values from?
body: <p>For example, say I want to create text in HTML with the color blue and a size of 13px.</p>
  <p>Is there any way I can do something like:</p>
  <pre><code>&lt;h1 class = &quot;blue 13px&quot;&gt;Hallo&lt;/h1&gt;
  </code></pre>
  <p>And then use CSS to make it blue and 13 px without doing:</p>
  <pre><code>.blue 13px {
      color: blue;
      font-size: 13px;
  }
  </code></pre>