Function setMarkdownHeader

setMarkdownHeader(notebook, level, translator?): void
Set the markdown header level.
Parameters
- notebook: Notebook
  The target notebook widget.
- level: number
  The header level.
- Optional translator: ITranslator
  The application translator.
  
  Notes
  All selected cells will be switched to markdown. The level will be clamped between 1 and 6. If there is an existing header, it will be replaced. There will always be one blank space after the header. The cells will be unrendered.
Returns void
- Defined in packages/notebook/src/actions.tsx:1792