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What about browser compatibility? The article doesn't mention how well font icons hold up against different versions of IE.

Does anyone know?

CSS Web fonts have been in IE since (essentially) forever, and the :before / :after pseudo-element since IE8.

one thing I'd like to scream from the rooftops about Web fonts in IE, though: IE respects the TrueType/OpenType embedding level, but at least some other browsers (last I checked) don't. if your Web fonts are set to an embedding level below "installable", IE will refuse to embed them and use the default font instead. double-check to make sure your font embeds properly in IE 9 before pushing to production.

edit to add: to check, open up the developer tools with F12, go to the console, refresh your page, and make sure you're free of errors like this:

"CSS3114: @font-face failed OpenType embedding permission check. Permission must be Installable. iconic_stroke.otf"

(this error taken from the link in the OP, the icons on which completely fail to render properly in IE 9.)

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