code: def test_read_html_cell_from_md(no_jupytext_version_number):
      md = """---
  jupyter:
    jupytext:
      main_language: csharp
  ---
  
  ```html
  <b>Hello!</b>
  ```
  """
  
      nb = jupytext.reads(md, "md")
      assert len(nb.cells) == 1
      assert nb.cells[0].cell_type == "code"
      compare(nb.cells[0].source, "#!html\n<b>Hello!</b>")
  
      md2 = jupytext.writes(nb, "md")
      compare(md2, md)
  
imports: import pytest
  import jupytext
  from jupytext.compare import compare
label_desc: Use image node_id 3 for calling a global function with example usage: test_read_html_cell_from_md(no_jupytext_version_number) without return types