Prompt About Blank?

[CRLF]

Here are a few links that seem to discuss with what you're describing.

The last one is an app mentioned in the discussions that deals with the about:blank page.

How to Load Another Webpage in the Custom HTML Prompt? - Questions & Suggestions - Keyboard Maestro Discourse

Beyond AboutWeb for the HTML Prompt - Questions & Suggestions - Keyboard Maestro Discourse

GitHub - szhu/AboutWeb: There is now an application set to open the URL about:blank.