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Protocols and standards
Pages are located by means of a URL (uniform resource locator), which is treated as an address, beginning with http: for HTTP access. Many browsers also support a variety of other URL types and their corresponding protocols, such as ftp: for FTP (file transfer protocol), rtsp: for RTSP (real-time streaming protocol), and https: for HTTPS (an SSL encrypted version of HTTP). The file format for a web page is usually HTML (hyper-text markup language) and is identified in the HTTP protocol using a MIME content type. Most browsers natively support a variety of formats in addition to HTML, such as the JPEG, PNG and GIF image formats, and can be extended to support more through the use of plugins. The combination of HTTP content type and URL protocol specification allows web page designers to embed images, animations, video, sound, and streaming media into a web page, or to make them accessible through the web page. Early web browsers supported only a very simple version of HTML. The rapid development of proprietary web browsers led to the development of non-standard dialects of HTML, leading to problems with Web interoperability. Modern web browsers support a combination of standards- and defacto-based HTML and XHTML, which should display in the same way across all browsers. No browser fully supports HTML 4.01, XHTML 1.x or CSS 2.1 yet. Currently many sites are designed using WYSIWYG HTML generation programs such as Macromedia Dreamweaver or Microsoft FrontPage. These often generate non-standard HTML by default, hindering the work of the W3C in developing standards, specifically with XHTML and CSS (cascading style sheets, used for page layout).
HistoryImage:Windows Mosaic 3.0.png Mosaic 3.0 for Windows Image:Navigator 1-22.png Netscape Navigator 1.22 Image:Internet Explorer 4.png Internet Explorer 4.0 under Windows 98 Image:Safari RSS 2.0.4.png Safari 2.0.4 (RSS) under Mac OS X v10.4 showing the Wikipedia Main Page Image:Internet Explorer 6.png Internet Explorer 6.0 under Windows XP Image:Firefox2.png Mozilla Firefox 2 running on Ubuntu, displaying the English Wikipedia main page.
The first browser, Silversmith, was created by John Bottoms in 1987.[3] The browser, based on SGML tags, used a tag set from the Electronic Document Project of the AAP with minor modifications and was sold to a number of early adopters. At the time SGML was used exclusively for the formatting of printed documents. The use of SGML for electronically displayed documents signaled a shift in electronic publishing and was met with considerable resistance. Silversmith included an integrated indexer, full text searches, hypertext links between images text and sound using SGML tags and a return stack for use with hypertext links. It included features that are still not available in today's browsers. These include capabilities such as the ability to restrict searches within document structures, searches on indexed documents using wild cards and the ability to search on tag attribute values and attribute names. SGML-FAQ US Patent In 1992, Tony Johnson releases the MidasWWW browser. Based on Motif/X, MidasWWW allows viewing of PostScript files on the Web from Unix and VMS, and even handles compressed PostScript. [1] Another early popular web browser was ViolaWWW, which was modeled after HyperCard. However, the explosion in popularity of the web was triggered by NCSA Mosaic which was a graphical browser running originally on Unix but soon ported to the Apple Macintosh and Microsoft Windows platforms. Version 1.0 was released in September 1993, and was dubbed the killer application of the Internet. Marc Andreessen, who was the leader of the Mosaic team at NCSA, quit to form a company that would later be known as Netscape Communications Corporation. Netscape released its flagship Navigator product in October 1994, and it took off the next year. Microsoft, which had thus far not marketed a browser, now entered the fray with its Internet Explorer product, purchased from Spyglass Inc. This began what is known as the browser wars, the fight for the web browser market between Microsoft and Netscape. The wars put the web in the hands of millions of ordinary PC users, but showed how commercialization of the web could stymie standards efforts. Both Microsoft and Netscape liberally incorporated proprietary extensions to HTML in their products, and tried to gain an edge by product differentiation. Starting with the acceptance of the Microsoft proposed Cascading Style Sheets over Netscape's JavaScript Style Sheets (JSSS) by W3C, the Netscape browser started being generally considered inferior to Microsoft's browser version after version, from feature considerations to application robustness to standard compliance. The wars effectively ended in 1998 when it became clear that Netscape's declining market share trend was irreversible. This trend may have been due in part to Microsoft's integrating its browser with its operating system and bundling deals with OEMs; Microsoft faced antitrust litigation on these charges. Netscape responded by open sourcing its product, creating Mozilla. This did nothing to slow Netscape's declining market share. The company was purchased by America Online in late 1998. At first, the Mozilla project struggled to attract developers, but by 2002 it had evolved into a relatively stable and powerful internet suite. Mozilla 1.0 was released to mark this milestone. Also in 2002, a spin off project that would eventually become the popular Mozilla Firefox was released. In 2004, Firefox 1.0 was released; Firefox 1.5 was released in November 2005. Firefox 2, a major update, was released in October 2006 and work has already begun on Firefox 3 which is scheduled for release in 2007. As of 2006, Mozilla and its derivatives account for approximately 12% of web traffic. Opera, an innovative, speedy browser popular in handheld devices, particularly mobile phones, as well as on PCs in some countries was released in 1996 and remains a niche player in the PC web browser market. It is available on Nintendo's DS, DS Lite and Wii consoles[2]. The Opera Mini browser uses the Presto (layout engine) like all versions of Opera, but runs on most phones supporting Java Midlets. The Lynx browser remains popular for Unix shell users and with vision impaired users due to its entirely text-based nature. There are also several text-mode browsers with advanced features, such as w3m, Links (which can operate both in text and graphical mode), and the Links forks such as ELinks. The Macintosh scene too has traditionally been dominated by Internet Explorer and Netscape. However, Apple's Safari, the default browser on Mac OS X since version 10.3, has slowly grown to dominate this market. In 2003, Microsoft announced that Internet Explorer would no longer be made available as a separate product but would be part of the evolution of its Windows platform, and that no more releases for the Macintosh would be made. However, in early 2005, Microsoft changed its plans, releasing version 7 of Internet Explorer for Windows XP, Windows Server 2003, and Windows Vista in October 2006. FeaturesDifferent browsers can be distinguished from each other by the features they support. Modern browsers and web pages tend to utilize many features and techniques that did not exist in the early days of the web. As noted earlier, with the browser wars there was a rapid and chaotic expansion of browser and World Wide Web feature sets. The following is a list of some of the most notable features: Standards support
Fundamental features
Usability and accessibility features
Annoyance removers
Footnotes
See also
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