Can a diagonal table columns/cells be implemented in HTML/CSS/Javascript?
I’ve been googling for several hours and the only resource I can find is splitting cells diagonally and not rotate part of a table/column.
Screenshot:

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Like @Giacomo1968 wrote in their answer, you want to use
Divor betterUltag instead.As for the turn, use CSS3 to rotate your finished table:
So basically your table is made out of two tables, one is normal, other is using CSS3 to rotate.