Hmm, I wonder why. Did you try this on something like tiddlywiki.com? Or was it on another site where custom CSS might have been interfering? In any case, I made another version that uses a modification of your table to hook the hovering to:
It’s here: Old XBox Controller with hover 2.json (452.8 KB)
Well, it’s more that you can generate CSS with wikitext. This doesn’t work in a tiddler with type text/css, since there wikitext markup is not rendered. But with the default type, you can generate the CSS that you might need. That’s what we do here.