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  2. Polyfill (programming) - Wikipedia

    en.wikipedia.org/wiki/Polyfill_(programming)

    Though most polyfills target out-of-date browsers, some exist to simply push modern browsers forward a little bit more. Lea Verou's -prefix-free polyfill is such a polyfill, allowing current browsers to recognise the unprefixed versions of several CSS3 properties instead of requiring the developer to write out all the vendor prefixes.