title: How to know which submit button fired the onsubmit event
body: <p>When you have more than one submit button in a form, is there a way to know which one fired the <code>onsubmit</code> event without adding code to the buttons themselves?</p>
  
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  <p><strong>Edit:</strong> I need to do the check on the client-side, i.e. with JavaScript.</p>