HTML Fragment parsing always happens with a context node, which may impact how a fragment of HTML is parsed. HTML Fragment Processors can be instantiated with a `BODY` context node via `WP_HTML_Processor::create_fragment( $html )`.
This changeset adds a static method called `create_fragment_at_current_node( string $html_fragment )`. It can only be called when the processor is paused at a `#tag`, with some additional constraints:
- The opening and closing tags must appear in the HTML input (no virtual tokens).
- No "self-contained" elements are allowed ( `IFRAME`, `SCRIPT`, `TITLE`, etc.).
If successful, the method will return a `WP_HTML_Processor` instance whose context is inherited from the node that the method was called from.
Props jonsurrell, bernhard-reiter, gziolo.
Fixes#62357.
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