title: What happens if the action field in a <form> has parameters?
body: <p>Is there a well-supported, common behavior that I can expect if I do something like this in HTML:</p>
  
  <pre><code>&lt;form method="get" action="/somePage.html?param1=foo&amp;param2=foo"&gt;
    &lt;input name="param2"&gt;&lt;/input&gt;
    &lt;input name="param3"&gt;&lt;/input&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>Seems like this sort of thing is inherently ridiculous, but I've seen it used here and there and I was wondering what on Earth the expected behavior should be.  Are browsers smart enough to tack on "&amp;param2=whatever&amp;param3=whatever" to the action, or do they just throw in a second question mark?  Or what?  Are there cases where this is actually the right way to do things?</p>