* '''[serversniff]''': When the sniffing is happening on the server-side such as HTTP redirection and/or different content being served on the same domain
* '''[lib-foo]''': When related to a specific JS lib being used. Example [lib-yui] [lib-jquery] [lib-mootools]
* '''[tier1]''': When the issue is about a site not giving the nicest experience that some other browsers get. For example, getting the low-end mobile version instead of the shiny touch version.
=== Dependencies bugs ===