A web page is a [[web page from what your reading a web page is a webpagestructured document]]. The core element is a [[text file]] written in the [[HTML|HyperText Markup Language]] (HTML). This specifies the content of the page,<ref name="elems">{{Cite book|last=Flanagan|first=David|title=JavaScript: the definitive guide|date=18 April 2011|publisher=O'Reilly|isbn=978-1-4493-9385-4|___location=Beijing; Farnham|page=1|language=English|oclc=686709345|quote=JavaScript is part of the triad of technologies that all Web developers must learn: HTML to specify the content of web pages, CSS to specify the presentation of web pages, and JavaScript to specify the behavior of web pages.}}</ref> including [[image]]s and [[video]].
[[CSS|Cascading Style Sheets]] (CSS) specify the [[Separation of content and presentation|presentation]] of the page.<ref name="elems"/> CSS rules can be in separate text files or embedded within the HTML file.
