title: Invalid align attribute HTML
body: <p>I have a table cell with an <code>align</code> attibute, like this:            </p>
  
  <pre><code>&lt;td style="border-right: #1c2872 1px solid; border-top: #1c2872 1px solid; border-left: #1c2872 1px solid; border-bottom: #1c2872 1px solid" 
      align="middle"  
      width="95"  
      bgColor="#fafad2"&gt;
          &lt;!-- Content here ... --&gt;
  &lt;/td&gt;
  </code></pre>
  
  <p>But I get this strange error:</p>
  
  <blockquote>
    <p>The 'align' attribute is invalid - The value 'middle' is invalid according to its datatype 'Union' - The value 'middle' is not valid according to any of the memberTypes of the union.</p>
  </blockquote>