title: How set height:0?
body: <p>I have 3 horizontally columns with style Float: left.
  I want to hide the first block (height:0) but I want that width of the first column was reserved.</p>
  
  <p>display:none or visibility:hidden  not fit my problem...</p>
  
  <p>This code don*t work !<strong>Why?</strong></p>
  
  <pre><code>this.parentNode.getElementsByClassName('body_rate')[0].style.height=0+'px';
  </code></pre>