title: View source code for builtin emacs package
body: <p>How can I view source code for a builtin Emacs package?
  For instance given lisp code <code>(require 'color)</code>, I would be interested in which functions are provided by that package. I googled <code>emacs "color.el"</code> and found the source code. But I wonder if this file can be viewed directly from within Emacs itself? By the way, <code>find . -name 'color*'</code> gives</p>
  
  <pre><code>./share/emacs/24.3/lisp/color.el.gz
  ./share/emacs/24.3/lisp/color.elc
  </code></pre>