3 ms·

Not a bug, probably just CSS's ridiculous selector algorithm. IIRC, the algorithm looks something like (100xid's) + (10xclasses) ...

• rorrr 14y ago
  EDIT: i'm wrong
• nemetroid 14y ago
  The algorithm looks like that "in a number system with a large base". It is arguably not what the spec intended but probably acceptable in exchange for performance.