I fixated the two first left columns in my tables based on https://stackoverflow.com/a/17557830/1272712. The columns is only fixated, when the screen size is less than 768px - at which point the table is scrollable (see jsFiddle). It works great on Android, desktop Chrome and desktop Safari, but it doesn't work on iOS Safari and Chrome. Does iOS not support position:absolute
?
If anybody else have any alternative implementations, I'll accept that as an answer.