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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Add parenthesis to macro arguments in internal_helpers.h

Implement Dom\HTMLElement class

Fix bug #79701: getElementById does not correctly work with duplicate definitions

This is a long standing bug: IDs aren't properly tracked causing either
outdated or plain incorrect resu

Fix bug #79701: getElementById does not correctly work with duplicate definitions

This is a long standing bug: IDs aren't properly tracked causing either
outdated or plain incorrect results from getElementById.

This PR implements a pragmatic solution in which we still try to use the
ID lookup table to a degree, but only as a performance boost not as a
"single source of truth". Full details are explained in the
getElementById code.

Closes GH-14349.

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

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