title: What's the effect of adding 'return false' to a click event listener?
body: <p>Many times I've seen links like these in HTML pages:</p>
  
  <pre><code>&lt;a href='#' onclick='someFunc(3.1415926); return false;'&gt;Click here !&lt;/a&gt;
  </code></pre>
  
  <p>What's the effect of the <code>return false</code> in there?</p>
  
  <p>Also, I don't usually see that in buttons.</p>
  
  <p>Is this specified anywhere? In some spec in w3.org?</p>