title: What is the purpose of line-height, and what does white-space:nowrap do?
body: <p>what's <code>line-height</code> supposed to do since there is already an attribute called <code>font-size</code>?</p>
  
  <p>And what does it mean when we specify something like:</p>
  
  <pre><code>white-space:nowrap;
  </code></pre>