Polyfill

In web development, a polyfill (or polyfiller) is additional code which provides facilities that are not built into a web browser. It implements technology that a developer expects the browser to provide natively, providing a more uniform API landscape. For example, many features of HTML5 are not supported by versions of Internet Explorer older than version 8 or 9, but can be used by web pages if those pages install a polyfill. Web shims and HTML5 Shivs are related concepts.

单词	Polyfill
释义	Polyfill 英语百科 Polyfill In web development, a polyfill (or polyfiller) is additional code which provides facilities that are not built into a web browser. It implements technology that a developer expects the browser to provide natively, providing a more uniform API landscape. For example, many features of HTML5 are not supported by versions of Internet Explorer older than version 8 or 9, but can be used by web pages if those pages install a polyfill. Web shims and HTML5 Shivs are related concepts.
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