title: Is it valid to have a html form inside another html form?
body: <p>Is it valid html to have the following:</p>
  
  <pre><code>&lt;form action="a"&gt;
      &lt;input.../&gt;
      &lt;form action="b"&gt;
          &lt;input.../&gt;
          &lt;input.../&gt;
          &lt;input.../&gt;
      &lt;/form&gt;
      &lt;input.../&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>So when you submit "b" you only get the fields within the inner form. When you submit "a" you get all fields minus those within "b".</p>
  
  <p>If it isn't possible, what workarounds for this situation are available?</p>