Had discussions with @lachlanhardy and @julio_ody about their great lectioapp.com.

Had some issues with the fact that they felt the need to use text-shadow on the body text, and @julio_ody says it was to fix the rendering for Safari, compared to Firefox (recent-verion).

So, I decided to take a look. This is a really rough experiment.

What I did was to open the site in Firefox, Chrome and Safari, screen grab the same paragraph then do a difference between them in Photoshop.

Unfortunately, I didn't remember to do the windows the same width, so could only compare the first sentence.

Anyway, what I found was tha there's essentially no difference whatsoever between Chrome and Safari. Makes sense, their both WebKit.

The difference between Firefox and Safari, though, was remarkable, mostly to do with letter-spacing. I presume this is what @julio_ody is referring to, and it would appear that Safari adjusts the letter-spacing when you add a text-shadow.

Here's the diffs: