[RFC] Add a way to opt-in ext/dom spec compliance (#13031)

RFC: https://wiki.php.net/rfc/opt_in_dom_spec_compliance

[RFC] DOM HTML5 parsing and serialization support (#12111)

Fix registerNodeClass with abstract class crashing

This always results in a segfault when trying to instantiate, so this never
worked. At least throw an error instead of segfaulting to p

Fix registerNodeClass with abstract class crashing

This always results in a segfault when trying to instantiate, so this never
worked. At least throw an error instead of segfaulting to prevent developers
from being confused.

Closes GH-12420.

show more ...