On 4 Mar 2011, at 01:54, John Daggett <jdagg...@mozilla.com> wrote:
> …FF also does subpixel positioning while Safari
> snaps everything to pixel positions, as Philippe noted.  

Briefly, while we're on the subject, I might add that this difference of policy 
of maths-to-the-pixel applies to a great number of things (not just 
letter-spacing) — in one of the less dynamic battles in the war for good 
typography on the web, it might be noted that many (of the hundreds of 
otherwise quite beautiful) badly-hinted fonts can become quite passable in 
Firefox when given a text-shadow in the same colour as the font, with offsets 
at 0 and a range/size of .6 pixels, thereby giving an anti-aliasing 
compensation for otherwise blocky presentation. The same is sadly not true of 
Webkit — ditto for cumulative fractionally defined (%, em) metrics (use case: 
columns) and far more.

Ironic considering Webkit has for some time been the de facto standard browser 
on variable pixel-density devices, where the issue becomes incredibly pertinent.

Regards,
Barney
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