Fix XML serializer errata: xmlns="" serialization should be allowed

The spec doesn't want to serialize xmlns:foo="", but the description of
the step that checks this does not take into a

Fix XML serializer errata: xmlns="" serialization should be allowed

The spec doesn't want to serialize xmlns:foo="", but the description of
the step that checks this does not take into account that xmlns="" must
be allowed. This patch corrects this errata.

Closes GH-15894.

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Support templated content

The template element in HTML 5 is special in the sense that it does not
add its contents into the DOM tree, but instead keeps them in a separate
shadow DOM

Support templated content

The template element in HTML 5 is special in the sense that it does not
add its contents into the DOM tree, but instead keeps them in a separate
shadow DOM document fragment. Interacting with the DOM tree cannot touch
the elements in the document fragment.

Closes GH-14906.

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Refactor XML serializer such that passing context is easier

Implement Dom $innerHTML property

Trim trailing whitespace (#14721)

Follow-up on GH-13516: include config.h from build dir for new files in ext-dom (#14705)

GH-13516 was created before the new DOM files were added, and the PR was
never rebased to include

Follow-up on GH-13516: include config.h from build dir for new files in ext-dom (#14705)

GH-13516 was created before the new DOM files were added, and the PR was
never rebased to include the new DOM files, so there are three places
which were not replaced.

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Get rid of unused declarations

Cleanup some repetition and macros in xml_serializer.c (#14182)

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