title: What are the reasons not to allow HTML tables when validating user input fields?
body: <p>I'm writing a little bit of a wiki and going through all of my options for syntax highlighting. Debating between wiki syntax (mediawiki) and markdown + whitelisted tags. I think I would prefer the latter but I think my users will need tables. Why are tables disallowed here on Stackoverflow?</p>
  
  <pre><code>&lt;table&gt; &lt;tr&gt; &lt;td&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt;
  </code></pre>