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This topic created in 3064 days ago, the information mentioned may be changed or developed.
I ofen see polyfill words in documents. I wonder know what it points?
I quote wikipedia:
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 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".
As a result, polyfill is a tools supporting a no-built in feature.
It is not just belong to web browsers,more than web development.
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hjdtl Dec 7, 2017
百度了一下，感觉这个答案还不错： https://segmentfault.com/a/1190000002593432
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SourceMan Dec 7, 2017
Google 了一下，感觉这个答案还不错： https://stackoverflow.com/questions/7087331/what-is-the-meaning-of-polyfills-in-html5
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kamal Dec 7, 2017
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serco Dec 7, 2017
英文不忍直视啊。。。
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robinlovemaggie Dec 7, 2017
简单点说兼容新老浏览器的库就是 polyfill，否则不是。例如，jQuery 不是，Polymer, FlashCavas 是。
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Mutoo Dec 7, 2017
If you want to use an edge or modern feature on a widespread old browser (e.g. es2015 Promises), you can use the polyfill (e.g. Promises-polyfill), if the new feature is not internal provided but can be implemented within the current javascript's scope.
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shanechiu OP @hjdtl I read the article throughly, it is fully. Thank you for your recommendation.
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