title: how to get transparent window in GNU Emacs on OSX?
body: <p>I'm on GNU Emacs in OSX Mavericks and I'm trying to make my background transparent but not the text. </p>
  
  <p>There's an easy way to make the whole frame transparent:</p>
  
  <pre><code>(set-frame-parameter (selected-frame) 'alpha '(85 85))
  (add-to-list 'default-frame-alist '(alpha 85 85))
  </code></pre>
  
  <p>But this makes the whole frame transparent/translucent, including the text. I want only the frame background to be transparent and the text to be a solid black. Someone on the Emacs Wiki said that such an implementation would have to be OS-specific. So, does anyone know how to do this for OSX?</p>
  
  <p>With desired settings, Emacs would look like this:<br>
  <img src="https://i.imgur.com/V2Ugpc5.png" alt="truly transparent Emacs window" title="truly transparent Emacs window">.</p>
  
  <p>Again, I want the window 100% transparent and the foreground text 100% opaque, and it should work in Emacs' full-screen mode.</p>