I wondered the same. Searching for OpenType and Stylistic Alternates I found the OpenType playground [1][2]. (I had to manually add a CSS @font-face rule to use

I wondered the same. Searching for OpenType and Stylistic Alternates I found the OpenType playground [1][2]. (I had to manually add a CSS @font-face rule to use a OpenType font.) [1] http://people.mozilla.org/~jkew/feature-samples/opentype-feature-playground.html http://people.mozilla.org/~jkew/feature-samples/opentype-fea... [2] https://hacks.mozilla.org/2009/10/font-control-for-designers/ https://hacks.mozilla.org/2009/10/font-control-for-designers...