title: find submit button in selenium without id
body: <p>I have a button </p>
  
  <pre><code>&lt;input type="submit" class="button button_main" style="margin-left: 1.5rem;" value="something"&gt;
  </code></pre>
  
  <p>I cannot find it by id or name and need to submit a form.</p>
  
  <p>I tried doing this:
  Alternatively, WebDriver has the convenience method “submit” on every element. If you call this on an element within a form, WebDriver will walk up the DOM until it finds the enclosing form and then calls submit on that. If the element isn’t in a form, then the NoSuchElementException will be raised:
  element.submit()
  <a href="http://selenium-python.readthedocs.org/navigating.html" rel="noreferrer">http://selenium-python.readthedocs.org/navigating.html</a></p>
  
  <p>But that cannot find the submit selector either.</p>
  
  <p>ideas?</p>