arrowtype
Feature toggling and screen flash
Sometimes I want to test an idea using a stylistic set. It's simple enough for someone who knows a bit of css to manually add font-feature-settings: "ss01" on; however, I think might be more helpful if the features are auto-detected and added like the v-font sliders are. I imagine it would quickly get crowded if all features are included but maybe the basics can have small icons toggles.
On the subject of toggling, there is a related issue (I can open a separate issue on it, if necessary) where the screen flashes by doing a quick fade which is, in part, helpful to know that a change occurred but also distracting when manually toggling (re-type on <->off). Would it be possible to eliminate the flashing? I notice that adding the same css to dev tools allows for quick toggling without a flash.
