I think the point being made is that the contents of the file will be html whether it’s a static file on disk or dynamically generated using php. This may be mo

I think the point being made is that the contents of the file will be html whether it’s a static file on disk or dynamically generated using php. This may be more obvious when thinking about dynamically generated svg or pdf. Php nodes or python would be implantation details. HTML is the content type, and that is not likely to change.