title: What is event.clientY?
body: <p>I have this code and wanted to know what all those event.client do?</p>
  
  <pre><code>  document.body.ondblclick = function(){
      var dclick = false;
      if(event.clientX &gt; 8 &amp;&amp; event.clientX &lt; 204){
          if((event.clientY &gt; 88 &amp;&amp; event.clientY &lt; 129) ||
              (event.clientY &gt; 129 &amp;&amp; event.clientY &lt; 171) ||
              (event.clientY &gt; 172 &amp;&amp; event.clientY &lt; 212) ||
              (event.clientY &gt; 213 &amp;&amp; event.clientY &lt; 255) ||
              (event.clientY &gt; 256 &amp;&amp; event.clientY &lt; 297) ||
              (event.clientY &gt; 297 &amp;&amp; event.clientY &lt; 339)){
              dclick = true;
          }
      }
      }
  </code></pre>