title: JavaScript getBoundingClientRect() vs offsetHeight while calculate element height
body: <p>What is the best way to get element height:</p>
  
  <pre><code>var myElement = document.querySelector('.some-class');
  
  var height = myElement.getBoundingClientRect().height;
  </code></pre>
  
  <p>or</p>
  
  <pre><code>var myElement = document.querySelector('.some-class');
  
  var height = myElement.offsetHeight;  
  </code></pre>