You can use this filter to selectively serve something else to browsers which don't support TTF/OTF/WOFF embedding through @font-face.

• Safari
• Chrome¹
• Opera
• Gecko-based browsers
• Konqueror²

• SVG format ^[planned]

Internet Explorer supports @font-face since version 4.
Still if you wanna target a specific version of IE you could use downlevel-revealed conditional comments and add ||(!+"\v1") to the filter.

Reminder: ids can potentially pollute the global scope so remember to avoid naming them chrome, opera or konqueror.

¹ except 4.0.249.2–11
² except 4.3 ß1–RC1