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Cascading Style Sheets
(CSS) is a stylesheet language used to describe the presentation of a document written in a markup language. Its most common application is to style web pages written in HTML and XHTML, but the language can be applied to any kind of XML document, including SVG and XUL.

JavaScript
JavaScript is a scripting language most often used for client-side web development. "JavaScript" is an implementation of the ECMAScript standard.

JavaScript is a dynamic, weakly typed, prototype-based language with first-class functions. JavaScript was influenced by many languages and was designed to have a similar look to Java, but be easier for non-programmers to work with.[1] The language is best known for its use in websites (as client-side JavaScript), but is also used to enable scripting access to objects embedded in other applications.