General approach to the use of JavaScript in web pages
Unobtrusive JavaScript is a general approach to the use of client-side JavaScript in web pages so that if JavaScript features are partially or fully absent in a user's web browser, then the user notices as little as possible any lack of the web page's JavaScript functionality.[1] The term has been used by different technical writers to emphasize different aspects of front-end web development. For some writers, the term has been understood more generally to refer to separation of functionality (the "behavior layer") from a web page's structure/content and presentation,[2] while other writers have used the term more precisely to refer to the use of progressive enhancement to support user agents that lack certain JavaScript functionality and users that have disabled JavaScript.[3] Following the latter definition, unobtrusive JavaScript contributes to web accessibility insofar as it helps ensure that all users—whatever their computing platform—get roughly equal access to all of the web page's information and functionality.[4][5]
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^Keith, Jeremy (2006-06-20). "Behavioral Separation". www.alistapart.com. Retrieved 2007-01-27. Separating out behavior from markup like this is called unobtrusive JavaScript.
^Olsson, Tommy (2007-02-06). "Graceful Degradation & Progressive Enhancement". accessites.org. Archived from the original on 2017-05-17. Retrieved 2009-01-03. Progressive enhancement when it comes to JavaScript is becoming more common these days. The key to this is known as unobtrusive JavaScript. An unobtrusive script is silently ignored by user agents that do not support it, but is applied by more capable devices. Just like an external style sheet.
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^Connor, Joshue O. (2012). "Unobtrusive JavaScript". Pro HTML5 Accessibility: Building an Inclusive Web. Berkeley, CA: Apress. pp. 71. doi:10.1007/978-1-4302-4195-9_3. ISBN 9781430241942. OCLC 757486357.
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