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Polyfills
A polyfill is a piece of code, in JavaScript that is used to provide some functionality in a browser, that does not natively support it. They are written to replicate an API that is available in some browsers, for those who don’t have it or don’t have it completely working.
Sometimes, they are also used to solve the issue of different browsers implementing the same feature in different ways and giving JavaScript a standard-compliant way of accessing the feature – this reason for poly-filling was prevalent in the old IE6 and Netscape days, where each browser used to implement different features differently.
Simply put, one can imagine a polyfill as a common paste which can be used to fill holes and cracks to smooth out any defects in a wall. In the UK there is a popular brand name for this paste which is called “Polyfilla”. The JavaScript Polyfill fills in for the same pieces of missing functionality across browsers. Interesting stuff!