Tested with Firefox's [https://addons.mozilla.org/en-US/firefox/addon/7804 Universal Edit Button 1.2.1] plugin and
[[http://code.google.com/p/umonkey-tools/wiki/ueb|Universal Edit Button for Chrome]] extension.
This doesn't use rel="edit" as recommended in ''[[http://universaleditbutton.org/Registered_MIME_type#Recommended_Best_Practice|Best Practices]]'' for now, because the Chrome extension doesn't support it yet.