Class: HTMLPurifier_ChildDef_Chameleon  - X-Ref

Definition that uses different definitions depending on context.

The del and ins tags are notable because they allow different types of
elements depending on whether or not they're in a block or inline context.
Chameleon allows this behavior to happen by using two different
definitions depending on context.  While this somewhat generalized,
it is specifically intended for those two tags.