> Two fonts are being loaded in the CSS: 'Mercury SSm A', 'Mercury SSm
> B', then fallback fonts are defined. The two fonts each have
> missing characters, but put together they make a full set.
Ah, yes, I've missed this.
> It’s possible the two different fonts are hinted differently.
Exactly. The bytecode in the fonts are active for B/W hinting only
(and thus disabled for grayscale rendering). Depending on the
browser, you either get no hinting (e.g. Firefox), or auto-hinting
(e.g. Chrome).
If auto-hinting is active, you get different results because of the
limited set of glyphs in `Mercury SSm B': it doesn't contain the
necessary characters to compute all blue zones for Latin.
Werner
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