[[wp]] https://en.wikipedia.org/wiki/Polyfill_(programming) pull

• In web development, a polyfill is code that implements a feature on web browsers that do not support the feature. Most often, it refers to a JavaScript library that implements an HTML5 or CSS web standard, either an established standard (supported by some browsers) on older browsers, or a proposed standard (not supported by any browsers) on existing browsers. Formally, "a polyfill is a shim for a browser [API](https://en.wikipedia.org/wiki/Application_programming_interface "Application programming interface"".[1]

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