[commandlinefan]

I've tried to do what OP did more than a couple times using native HTML tables (for the same reason you suggest) and I've found it to be nearly impossible. Trying to force a table to keep columns one specific width and not jump around every time you change one of the cells is somewhere between an exercise in futility and not worth the pain. I think OP went the right way here.

[11235813213455]

What about CSS grid? I did a very basic one https://caub.github.io/misc/sheet without resizable columns, but I believe it'd work more easily than with tables