and is an essential part of web applications. The vast majority of
websites use it, and major web browsers have a dedicated
(including object-oriented and prototype-based) programming
styles. It has APIs for working with text, arrays, dates, regular
expressions, and the DOM, but the language itself does not include
any I/O, such as networking, storage, or graphics facilities. It
relies upon the host environment in which it is embedded to
provide these features.