class_docstr: Process Markdown Inside HTML Blocks which have been stored in the `HtmlStash`.
code: def test(self, parent: etree.Element, block: str) -> bool:
      # Always return True. `run` will return `False` it not a valid match.
      return True
  
imports: from __future__ import annotations
  from .None import Extension
  from ..blockprocessors import BlockProcessor
  from ..preprocessors import Preprocessor
  from ..postprocessors import RawHtmlPostprocessor
  from ..None import util
  from ..htmlparser import HTMLExtractor, blank_line_re
  import xml.etree.ElementTree
  from typing import TYPE_CHECKING, Literal, Mapping
label_desc: Use image node_id 1 for calling the MarkdownInHtmlProcessor obj's underlying member method code with example usage: obj.test(parent, block) and returns: True