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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Split off private data from the ns mapper

Reapply "Stop using reserved names in dom"

This reverts commit dda96768ece24cb56f09924baf9d6b9dd27ad587.

Revert "Remove unnecessary include statements from dom"

This reverts commit dd795022fa5644cc8a5a54fd63c99ab3c6bc81e1.

Revert "Stop using reserved names in dom"

This reverts commit 013bc53f0cf0c55a196a4336bc7d07dcded6ed95.

This somehow breaks the Windows build. Will investigate later.

Stop using reserved names in dom

Remove unnecessary include statements from dom

Implement Dom $innerHTML property

Preferably include from build dir (#13516)

* Include from build dir first

This fixes out of tree builds by ensuring that configure artifacts are included
from the build dir.

Preferably include from build dir (#13516)

* Include from build dir first

This fixes out of tree builds by ensuring that configure artifacts are included
from the build dir.

Before, out of tree builds would preferably include files from the src dir, as
the include path was defined as follows (ignoring includes from ext/ and sapi/) :

-I$(top_builddir)/main
-I$(top_srcdir)
-I$(top_builddir)/TSRM
-I$(top_builddir)/Zend
-I$(top_srcdir)/main
-I$(top_srcdir)/Zend
-I$(top_srcdir)/TSRM
-I$(top_builddir)/

As a result, an out of tree build would include configure artifacts such as
`main/php_config.h` from the src dir.

After this change, the include path is defined as follows:

-I$(top_builddir)/main
-I$(top_builddir)
-I$(top_srcdir)/main
-I$(top_srcdir)
-I$(top_builddir)/TSRM
-I$(top_builddir)/Zend
-I$(top_srcdir)/Zend
-I$(top_srcdir)/TSRM

* Fix extension include path for out of tree builds

* Include config.h with the brackets form

`#include "config.h"` searches in the directory containing the including-file
before any other include path. This can include the wrong config.h when building
out of tree and a config.h exists in the source tree.

Using `#include <config.h>` uses exclusively the include path, and gives
priority to the build dir.

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Move more common code into php_dom_next_in_tree_order() (#14363)

Use a ROL for mangling the pointer key in namespace_compat.c (#14331)

This might be a safer than throwing the lower bits away.

Remove unused arguments

Rename variable to avoid shadowing

[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)