Rififi Serif is provided as a TrueType font (for CSS embedding in Firefox), but also provided as an EOT font (for CSS embedding in Internet Explorer).
Included in the ZIP file, you will find a HTML/CSS test of embeded Rififi Serif, inside a webpage.
Rififi Serif is free for personal use only. If you want to use/embed it for a commercial project, please consider buying a license.
Damien Gosset : http://www.sweeep.fr