Everyone knows that on poppies a wonderful font rendering;) But, unfortunately, the text looks very bold on a dark background when smoothing “Medium”, which, to put it mildly, is annoying. For example, here is a slice of the Smashing Magazine menu with default rendering:

Fortunately, I found a workaround to this problem. It consists in the following: if you specify a shadow (text-shadow parameter), then for text with a shadow, “Photoshop” rendering without subpixel smoothing is turned on (Standard in System Preferences / Appearance). And no one bothers us to make a zero shadow :)
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We set the following parameter in CSS elements:
text-shadow: #000 0 0;
. We look:

Voila! I hope this trick will help aesthetic font lovers and Safari :)
UPD : If you are embarrassed by a scolding validator, then I can say that this is a bug of the validator itself, which checks
CSS2.1 , since The text-shadow parameter is valid and is present in
the CSS2 and CSS3
specifications . The solution to the problem is to select Profile: CSS version 2 or CSS version 3 in the More Options validator.