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font-size-adjust rounding error in Firefox

If the font-size-adjust property is the same as the font's true aspect ratio, there should be no change in size. So, for a single font, the default and adjusted sizes of the red box should be the same. Firefox seems to have a rounding error when using smaller font sizes; sometimes the adjusted box is actually one or two pixels too small (note Arial and Envy Code R).


Font Default size Adjusted size
Times New Roman bbbbbbbbb bbbbbbbbb
Arial bbbbbbbbb bbbbbbbbb
Envy Code R bbbbbbbbb bbbbbbbbb
Courier New bbbbbbbbb bbbbbbbbb


Font Default size Adjusted size
Times New Roman bbbbbbbbb bbbbbbbbb
Arial bbbbbbbbb bbbbbbbbb
Envy Code R bbbbbbbbb bbbbbbbbb
Courier New bbbbbbbbb bbbbbbbbb


Default size:
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Adjusted size:
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.