title: Safe keyboard shortcut for activating code completion style functionality in Mac OS X browsers
body: <p>I'm building some code completion style text expansion functionality for text areas and inputs in a web application. I'm trying to work out a safe keyboard shortcut for invoking the completion proposals for browsers running on Mac OS X.</p>
  
  <p>I've eliminated some potential candidates:</p>
  
  <ul>
  <li><kbd>Command</kbd> + <kbd>Space</kbd> - activates the Spotlight search field</li>
  <li><kbd>Control</kbd> + <kbd>Space</kbd> - activates the context menu in Firefox</li>
  <li><kbd>Esc</kbd> - cancels any background XMLHttpRequests in Firefox</li>
  </ul>
  
  <p>That leaves <kbd>Option</kbd> + <kbd>Space</kbd>. I'm aware that may conflict with tools like <a href="http://ubiquity.mozilla.com/" rel="nofollow noreferrer">Ubiquity</a>, but that's something we don't expect our audience to be using.</p>
  
  <p><strong>Are there any conflicts I may have missed with Option+Space? Or do you have a better idea for a keyboard shortcut, and why?</strong></p>