Why is the original font-size between 3 and 4?

A.E.

Member
One of our testers detects this facts:

This is a text with font-size 3
This is a text with font-size "Original" / untouched
This is a text with font-size 4

Why is the original font-size between 3 and 4?
 
Size 3 / 4 is an antiquated system that we use solely for styling user-marked-up text. It is inadequate to describe the font size we specify in CSS for normal body text.
 
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