title: What's the font-lock-mode for in emacs?
body: <p>I have font-lock mode on by putting (global-font-lock-mode 1) in .emacs. And, with font-lock mode "your program certainly look different" as explained in page 274 of <a href="https://rads.stackoverflow.com/amzn/click/com/0596006489" rel="nofollow noreferrer" rel="nofollow noreferrer">Learning GNU emacs</a>.</p>
  
  <p>What I found was that, with python mode or org mode, when I change the font for that mode, some of the keywords are not shown because of the change in color. I mean, some of the characters(keywords) becomes white, and when the background color is white, those keywords are not seen anymore. </p>
  
  <ul>
  <li>Is this expected behavior? With font-lock mode, am I supposed not to change any font?</li>
  <li>What's the good for font-lock mode? </li>
  </ul>
  
  <p>This is the code for changing default code. </p>
  
  <pre><code>;;; http://www.emacswiki.org/emacs/AquamacsFAQ
  (set-default-font "-apple-dejavu sans mono-medium-r-normal--0-0-0-0-m-0-mac-roman")
  </code></pre>
  
  <p>And I used the following options to change a font for specific mode. 
  <a href="http://a.imageshack.us/img823/2772/fontq.png" rel="nofollow noreferrer">http://a.imageshack.us/img823/2772/fontq.png</a></p>