Fix serialization of entity references in attributes (#13884)

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

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

Use strcspn() to optimize dom_html5_escape_string() (#12948)

* Use strcspn() to optimize dom_html5_escape_string()

This routine implemented by libc uses a faster algorithm than the

Use strcspn() to optimize dom_html5_escape_string() (#12948)

* Use strcspn() to optimize dom_html5_escape_string()

This routine implemented by libc uses a faster algorithm than the old
naive byte-per-byte approach here. It also is often optimized using
SIMD.

* Calculate mask outside of loop

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