I just tried Docs für the first time and the first thing that springs to my eye is the font size showing "px" as measurement. Being curious about this I downloaded a test doc as .docs and opened it in Word, which showed the correct size in points (e.g. 16px -> 12pt).
While I am happy that the measurement unit is no mistake and is converted correctly, I still wonder why Proton chose to go with px instead of pt while still offering the same sizes as other text editors, just using px as unit.

While the average user might not care I do think this could lead to some confusion on why shared documents show unexpected font sizes in other editors if you don't know the difference.

Diverting from an accepted standard is ok, but in my opinion it should be noted somewhere or possible to change to the "standard" unit.