SQL is not Relational.
MySQL is not SQL.
MSSQL is a reasonable stab at SQL with an inefficent back end.
Oracle is a reasonable stab at a back-end with a SQL that is weak because they want you to use their procedural version (and it's massively over complicated for all the wrong reasons).
PgSQL is fairly good to give them their dues but it is not relational and they have some weird ideas about "time travel" and various other ill thought out concept.s
Flat files aren't SQL.
CSS isn't SQL.
CSS is a good idea and once browsers stop bickering and designers stop pandering to browsers we will live in happier times.
Mercury "It's Like That" Wiz.