I don't mean HTML+CSS, I mean just HTML, as a middle-step between CSV and full spreadsheet file. HTML with only the table tags allowed get you a document that

I don't mean HTML+CSS, I mean just HTML, as a middle-step between CSV and full spreadsheet file. HTML with only the table tags allowed get you a document that you can 1) View in a browser, 2) Has table headers and the ability to define column widths and combine cells But you can leave presentation up to the viewer. Same principle as Markdown, but markdown tables are bad.