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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Reapply "Stop using reserved names in dom"

This reverts commit dda96768ece24cb56f09924baf9d6b9dd27ad587.

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

Implement Dom $innerHTML property

Implement CSS selectors

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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Be specific for the namespace of the id attribute (#14060)

Improve performance of text node allocation by marking the text node construction as always inline

Get rid of error gotos in HTML5 parse conversion

Fix potential NULL pointer argument to memcpy (#13859)

This is only possible when the length is 0, but memcpy doesn't like NULL
pointers, as UBSAN trips over it.

Use BAD_CAST consistently

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

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

Give anonymous dom structs a name (#13135)

Optimizations for HTML 5 loading (#12896)

* Fix inverted NULL and add dictionary

* Avoid useless error processing if no reporting is set

* Avoid double work while processin

Optimizations for HTML 5 loading (#12896)

* Fix inverted NULL and add dictionary

* Avoid useless error processing if no reporting is set

* Avoid double work while processing attributes and use fast text instantiation

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