> Firefox on Android uses Gecko. Which has < 1% marketshare, and is largely ignored by web developers. I didn't say it didn't exist, I said it wasn't relevant.

> Firefox on Android uses Gecko. Which has < 1% marketshare, and is largely ignored by web developers. I didn't say it didn't exist, I said it wasn't relevant. :) > The question is, how often are these directly used? Isn't the common pattern to target modern features without universal support through polyfills and solutions like Babel nowadays? Plenty often enough that users refused to use browsers without support for webkit prefixed properties. People who have a clue may well use polyfills and Babel and autoprefixer, but plenty just do copy/paste coding.