title: How to get inner HTML content height
body: <p>I want to get inner html height by JavaScript. Suppose I have </p>
  
  <pre><code>&lt;div&gt;Content&lt;/div&gt;
  </code></pre>
  
  <p>either if the div font size has increased or many divs nested inside the parent, how do I get the height of parent div?</p>
  
  <p>edit: even if the nested div has border and padding too.</p>