Apache is open source web server. It is world's most popular web server. Apache was released on 1995. Apache is most commonly used on Linux and available on other operating systems UNIX, Microsoft windows, eComStation, OpenVMS, NetWare. It is open source and free web server. Apache language support Perl, Python, Tcl, and PHP. 50% of all active websites run on Apache server. Apache website list
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CSS (Cascading Style Sheets) is used for presentation of a document written in a HTML. It is a cornerstone website technology. Cascading Style Sheets was released Håkon Wium Lie in late 1994. CSS is used for change layout, colors, images and fonts of document presentation. Cascading Style Sheets website list
XHTML (Extensible Hypertext Markup Language) is HTML standard for browser. XHTML website list