title: Which characters will break a double click highlight
body: <p>I am creating an online picture storage system that renames images using a 7 character alphanumeric code.  These codes are then used in URLs.  I would like to be able to double-click on these codes and copy them from a URL within Chrome's URL bar.  I am finding that certain characters  (<code>-</code> and <code>~</code>, to name a few) cause double-click to only highlight part of the code.  </p>
  
  <p>Is there a list of characters that double-click will not include in its grouping?  </p>
  
  <p>Is this an OS or browser specific list?  </p>
  
  <p>I would like for my system to use the greatest variety of (URL safe) characters, while still allowing double click to work.</p>