Use optical rendering?
Disable the automatic optical resizing of strokes and serifs for very small and very large fonts.
If the selected font has been designed with support for optical size variation, it can be disabled. Normally such fonts are rendered with slightly thicker strokes and larger serifs when the font size is very small.
Use of one these:
|auto||Use optical sizing if the font supports it and the font size is appropriate for it|
|none||Force optical sizing to be turned off in all cases|