My style is currently split up into multiple EXTRA.css files for clarity. However, I've also realised that doing that allows me to check for style property settings before including the CSS - for example, I have a "large avatars" option that's toggled by a style property: Code: /* Optional: Large Avatars on Posts */ <xen:if is="@largeAvatars"> <xen:include template="EXTRA_largeavatars.css" /> </xen:if> What I would love, though, is to be able to do the same to check the presence of an add-on - XenPorta, Responsive Design, User Online Status, etcetera. Is there the ability to check for whether an addon exists in template syntax, or alternately check the value of an option? For example: [RT] Status Online Ribbon has a displayOnlineLocation setting in Options. If that exists, I need to modify the CSS slightly to make it work with my large avatar hack. If I can check whether that setting exists/is set, I can include my hack for the addon if it exists, and leave it out if it isn't. The main reason I'm interested is because I have several thousand lines of custom CSS - and serving (for example) XenPorta styles when the user doesn't have XenPorta installed seems like a waste of bandwidth - and thus, precious loading time.