HTML5 Guidelines
A Note on Fonts
You may use web fonts, such as Adobe Web Fonts (https://edgewebfonts.adobe.com/) or Google fonts (https://www.google.com/fonts) with the following caveats:
- To maximize browser compatibility we suggest WOFF 1.0 - http://caniuse.com/#feat=woff
- .woff file will be served off the Yahoo CDN and count towards file weight of the ad
- Web fonts may render differently across browsers
- Designs using web fonts should be flexible enough to handle slight differences
- Must specify backup HTML font(s) in code