There is no question that the face of the web has been transformed in recent years by open source fonts. Prior to 2010, the only typefaces you were likely to see in a web browser were the generic “web safe” core fonts from Microsoft. But that year saw the start of several revolutions: the introduction of the Web Open Font Format (WOFF), which offered an open standard for efficiently delivering font files over HTTP, and the launch of web-font services like Google Fonts and the Open Font Library—both of which offered web publishers access to a large collection of fonts, for free, available under open licenses.