One of the problems I've had with the style property system is that when I release a new version of a skin, if I updated style properties and people using the skin also updated style properties, there is no clear way of knowing which ones need to be reverted.
When you go to upgrade a skin, XenForo will tell you that you have outdated templates. I was wondering if it would be possible for it to also flag that you have style properties that do not match what was upgraded.
Doing this in some easy and quick way to compare old values with new values and reverting if necessary would be a huge help to people upgrading their themes. Especially since XenForo's style property system can replace a majority of template edits (at least for design stuff).