Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. "Unobtrusive JavaScript" is a general approach to the use of JavaScript in web pages. Though the term is not formally defined, its basic principles are generally understood to include: Separation of functionality (the "behavior layer") from a Web page's structure/content and presentation. Best practices to avoid the problems of traditional JavaScript programming (such as browser inconsistencies and lack of scalability).Progressive enhancement to support user agents that may not support advanced JavaScript functionalityJavaScript historically has had a reputation for being a clumsy, hackish language unsuitable for serious application development. This has been largely due to inconsistent implementations of the language itself and the Document Object Model in various browsers, and the widespread use of buggy cut-and-paste code. Runtime errors were so common (and so difficult to debug) that few programmers even tried to fix them, as long as the script behaved more or less the way it was supposed to; scripts often failed completely in some browsers.

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