title: Check if an element's content is overflowing?
body: <p>What's the easiest way to detect if an element has been overflowed?</p>
  
  <p>My use case is, I want to limit a certain content box to have a height of 300px. If the inner content is taller than that, I cut it off with an overflow. But if it is overflowed I want to show a 'more' button, but if not I don't want to show that button.</p>
  
  <p>Is there an easy way to detect overflow, or is there a better method?</p>