Shows custom HTML in the preview panel

This action allows you to use the Preview accessory panel to show your own custom HTML/CSS. When custom HTML is shown, the panel contains an additional Done button that switches back to the default Markdown preview.

  • Input: Can be used as a variable in the HTML parameter
  • Output: Same as input


  • HTML: The source code of your HTML. You can use workflow variables here, in order to build a template that gets expanded dynamically when the workflow is run.
  • Title: Sets the title of the Preview tab while your custom HTML is shown. This has to be relatively short if you don’t want it to be truncated.
  • Base URL: Used for loading relative image references, links etc. Can be left empty if you only use absolute URLs.