By default, Firefox will apply kerning for font sizes at or over a certain
threshold (20 device pixels, currently).
I think "normal" should mean the UA default behavior; "auto" would also be
fine for this value. "kern" would force kerning (if supported at all).
"no-kern" would disable kerning.
I don't think we need to worry about browsers doing any kind of
analysis-based "automatic" kerning for the forseeable future...
Rob
--
"He was pierced for our transgressions, he was crushed for our iniquities;
the punishment that brought us peace was upon him, and by his wounds we are
healed. We all, like sheep, have gone astray, each of us has turned to his
own way; and the LORD has laid on him the iniquity of us all." [Isaiah
53:5-6]