title: Why does the "onmouseover" event use "return true" to prevent default behavior?
body: <p>I have been searching for this for some time, but haven't got any explanation.</p>
  
  <p>For "onclick" and other events in javascript, the event handler returning <strong><em>false</em></strong> means "prevent default action". However, there is one exception for "onmouseover". For "onmouseover", returning <strong><em>true</em></strong> means "prevent default action".</p>
  
  <p>Why is there such a weird exceptional case for "onmouseover"?</p>