We noticed similar problems and reported them to Apple. In our case (I am not quite sure if we figured out the logic) it was a WebKit bug and seems to be present in all versions of Mac OS X from Snow Leopard (10.6) up to Maverics (10.9), although it seems to be getting better.
Hello,
I've stumbled upon a bug in Safari (and webkit browsers) when using the Mark feature in web fonts,
As demonstrated by the screenshot, when a word has diacritics either on the beginning or the ending, the word space gets omitted.
I've tried my own fonts, and multiples fonts by other vendors but i get the same result, Only fonts that implement the Mark feature display the error.
Is anyone else facing the same problem?
Tested on Safari 6.0.5/osx 10.8.5
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