Highlighting timetables in web browser

[ChicagoPianoTuner]

When I generate a timetable and view it in a web browser, I used to be able to mouseover different fields and it would highlight. Now (a year later) that doesn't happen anymore. I'm on a new computer, but I can't figure out what's different. Can anyone advise?

[Liviu Lalescu]

You need to make the HTML level of the generated timetables 5 or 6 from the Settings menu. You need to generate after that, of course.

Volker might answer better.