title: bootstrap.min.css size from cdn shows a surprising size in devtools
body: <p><strong>In firefox</strong>
  <img src="https://i.stack.imgur.com/uBFJC.png" alt="enter image description here"></p>
  
  <p><strong>In chrome</strong>
  <img src="https://i.stack.imgur.com/zC0qw.png" alt="enter image description here"></p>
  
  <p>Could someone explain why the size in devtools is 24.5KB ?</p>
  
  <p>I load the bootstrap from this cdn : <a href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="noreferrer">bootstrap.min.css</a></p>
  
  <p><strong><em>ps</strong>: the cache was flushed during the test.</em></p>