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- html n 1: a set of tags and rules (conforming to SGML) for using them in developing hypertext documents [syn: hypertext markup language, hypertext mark-up language, html]
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Hypertext Markup Language HTML
<hypertext, World-Wide Web, standard> (html) A hypertext document format used on the World-Wide Web. html is built on top of SGML. "Tags" are embedded in the text. A tag consists of a "<", a "directive" (in lower case), zero or more parameters and a ">". Matched pairs of directives, like "<title>" and "</title>" are used to delimit text which is to appear in a special place or style.
Links to other documents are in the form
<a href="http://machine.edu/subdir/file.html">foo</a>
where "<a>" and "</a>" delimit an "anchor", "href" introduces a hypertext reference, which is most often a Uniform Resource Locator (URL) (the string in double quotes in the example above). The link will be represented in the browser by the text "foo" (typically shown underlined and in a different colour).
A certain place within an html document can be marked with a named anchor, e.g.:
<a name="baz">
The "fragment identifier", "baz", can be used in an href by appending "#baz" to the document name.
Other common tags include <p> for a new paragraph, <b>..</b> for bold text, <ul> for an unnumbered list, <pre> for preformated text, <h1>, <h2> .. <h6> for headings.
html supports some standard SGML national characters and other non-ASCII characters through special escape sequences, e.g. "é" for a lower case 'e' with an acute accent. You can sometimes get away without the terminating semicolon but it's bad style.
Most systems will ignore the case of tags and attributes but lower case should be used for compatibility with XHTML.
The World-Wide Web Consortium (W3C) is the international standards body for html.
Latest version: XHTML 1.0, as of 2000-09-10.
(http://w3.org/MarkUp/).
Character escape sequences (http://w3.org/hypertext/WWW/MarkUp/ISOlat1.html).
See also weblint.
(2006-01-19) - html HyperText Markup Language (Internet, WWW, SGML, RFC 1866/1942, HTML)
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- Windows Registry
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-
Microsoft
Microsoft Corporation is a public multinational corporation headquartered in Redmond, Washington, USA that develops, manufactures, licenses, and supports a wide range of products and services predominantly related to computing through its various product divisions. Established on April 4, 1975 to develop and sell BASIC interpreters for the Altair 8800, Microsoft rose to dominate the home computer operating system (OS) market with MS-DOS in the mid-1980s, followed by the Microsoft Windows line of OSs. The ensuing rise of stock in the company's 1986 initial public offering (IPO) made an estimated four billionaires and 12,000 millionaires from Microsoft employees. Microsoft would come to dominate other markets as well, notably the office suite market with Microsoft Office.
http://wn.com/Microsoft
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Bert Bos
Gijsbert (Bert) Bos (born 10 November 1963, The Hague) is a computer scientist. He studied mathematics at the University of Groningen, and wrote his PhD thesis on Rapid user interface development with the script language Gist.
http://wn.com/Bert_Bos -
Dan Connolly
Dan Connolly received a B.S. in Computer Science from the University of Texas at Austin in 1990. His research interests include investigating the value of formal descriptions of chaotic systems like the Web, particularly in the consensus-building process, and the Semantic Web.
http://wn.com/Dan_Connolly -
Håkon Wium Lie
http://wn.com/Håkon_Wium_Lie -
Robert Cailliau
Robert Cailliau (), born 26 January 1947, is a Belgian informatics engineer and computer scientist who, together with Sir Tim Berners-Lee, developed the World Wide Web.
http://wn.com/Robert_Cailliau -
Ted Nelson
Theodor Holm Nelson (born 1937) is an American sociologist, philosopher, and pioneer of information technology. He coined the terms "hypertext" and "hypermedia" in 1963 and published it in 1965. He also is credited with first use of the words transclusion, virtuality, intertwingularity and teledildonics. The main thrust of his work has been to make computers easily accessible to ordinary people. His motto is:
http://wn.com/Ted_Nelson -
Tim Berners-Lee
Sir Timothy John "Tim" Berners-Lee, OM, KBE, FRS, FREng, FRSA (born 8 June 1955, also known as "TimBL"), is a British engineer and computer scientist and MIT professor credited with inventing the World Wide Web, making the first proposal for it in March 1989. On 25 December 1990, with the help of Robert Cailliau and a young student at CERN, he implemented the first successful communication between an HTTP client and server via the Internet.
http://wn.com/Tim_Berners-Lee
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Learn HTML and CSS Tutorial. Howto make website from scratch
- Order: Reorder
- Duration: 39:20
- Published: 03 Feb 2008
- Updated: 02 Jul 2012
You can put your site on the web using a free host blog.jimmyr.com Yeah, it's long. #1 requested tutorial on my page is how to make your own site though. I guess it beats those "learn html in 24 hours" books in any case. See the freehosts below on how to put your page online. w3 html...
http://wn.com/Learn_HTML_and_CSS_Tutorial_Howto_make_website_from_scratch
Beginning HTML (XHTML) Tutorial
- Order: Reorder
- Duration: 33:21
- Published: 08 Feb 2009
- Updated: 01 Jul 2012
This is a beginning tutorial for XHTML. This tutorial includes parts 1-4 of the shorter series and runs approximately 35 minutes.
http://wn.com/Beginning_HTML_XHTML_Tutorial
HTML Tutorial 1 - Designing A Website In Notepad - Basics and Beginnings
- Order: Reorder
- Duration: 6:32
- Published: 11 Feb 2009
- Updated: 02 Jul 2012
In this HTML website design tutorial I will teach you how to write and format your very first web page using HTML. Difficulty Level: Easy/Beginner If you have any problems or need help with any of this tutorial please leave a comment below or message me on YouTube.
http://wn.com/HTML_Tutorial_1_Designing_A_Website_In_Notepad_Basics_and_Beginnings
HTML Tutorial for Beginners - part 1 of 4
- Order: Reorder
- Duration: 8:42
- Published: 22 Mar 2008
- Updated: 01 Jul 2012
www.LittleWebHut.com How to make a website: HTML Tutorial - Basics. Start off with a solid foundation by learning some of the basics of HTML - XHTML. In this HTML tutorial you will learn how to make a simple webpage. The tutorial starts off with definitions for both HTML and XHTML. It then goes on to demonstrate how you can use Microsoft Notepad to create your HTML file. It explains what HTML tags are and how to use some of the basic ones. This tutorial also shows how to display the HTML file in a web browser. This tutorial is based on XHTML version 1.0.
http://wn.com/HTML_Tutorial_for_Beginners_part_1_of_4
Basic HTML Tutorial
- Order: Reorder
- Duration: 3:22
- Published: 13 Mar 2007
- Updated: 23 Jun 2012
www.vidtutorial.com - This is a very, very basic HTML tutorial that discusses tags and a basic layout.
http://wn.com/Basic_HTML_Tutorial
HTML Lesson: Your First Web Page
- Order: Reorder
- Duration: 14:09
- Published: 04 Oct 2010
- Updated: 01 Jul 2012
Watch more at www.educator.comOther Computer Science subjects include CSS, Java, JavaScript, PHP, Wordpress, with more coming soon. We also offer math/science help in Pre-Algebra, Algebra 1/2, Basic Math, Trigonometry, Pre-Calculus, Geometry, Calculus, Statistics, Biology, Chemistry, Statistics, and Physics. -All lectures are broken down by individual topics -No more wasted time -Just search and jump directly to the answer
http://wn.com/HTML_Lesson_Your_First_Web_Page
Learn HTML - Lesson 1
- Order: Reorder
- Duration: 6:53
- Published: 18 Jan 2008
- Updated: 01 Jul 2012
Learn the basics of html with this simple video. If you don't want to use notepad, you can use a live editor. Live editor: htmledit.squarefree.com
http://wn.com/Learn_HTML_Lesson_1
Grocery Store Wars (2005)
- Order: Reorder
- Duration: 5:51
- Published: 14 Nov 2006
- Updated: 02 Jul 2012
Not long ago in a supermarket not so far away. Help fight the dark side of the farm. Rate the film, favorite the film, comment the film and subscribe to our channel for the freshest Free Range films.
http://wn.com/Grocery_Store_Wars_2005
HTML 5: Features you want desperately but still can't use
- Order: Reorder
- Duration: 86:20
- Published: 25 Sep 2008
- Updated: 25 Jun 2012
Speaker: Ian Hickson As the HTML5 effort reaches its first big milestone -- feature completeness -- browsers are starting to implement it. It will be years before you can rely on HTML5 support when writing Web pages and applications, but you can start to experiment today to get a feel of what the new standard offers. This talk will explore some of the most recent implementations of HTML5 features.
http://wn.com/HTML_5_Features_you_want_desperately_but_still_can't_use
What is HTML?
- Order: Reorder
- Duration: 4:44
- Published: 04 Apr 2008
- Updated: 18 Jun 2012
This tutorial explains what HTML is and the basic format of a HTML page. Hope it helps! I will probably be reuploading this tutorial later.
http://wn.com/What_is_HTML?
Introduction to HTML Tutorial 1
- Order: Reorder
- Duration: 9:34
- Published: 08 Dec 2008
- Updated: 02 Jul 2012
www.learntoprogram.tv Follow me on Google+ www.MarkLassoff.com Follow me on Twitter @mlassoff Udemy Course: ude.my From Learn To Program dot TV (LearnToProgram.TV) this is lesson one of our HTML / XHTML course. In this tutorial, the basic document structure is introduced as well as how to write an HTML script, and display the results in the browser. To learn HTML you need a web browser and a text editor-- both of which come with any Windows or Macintosh Machine. This course is part of the larger Introduction to HTML course. You may purchase a High resolution video and the exercise files and LearnToProgram.TV. Long time instructor, Mark Lassoff hosts the video and course.
http://wn.com/Introduction_to_HTML_Tutorial_1
Faster HTML and CSS: Layout Engine Internals for Web Developers
- Order: Reorder
- Duration: 61:15
- Published: 18 Nov 2008
- Updated: 22 Jun 2012
Google Tech Talks November 12, 2008 ABSTRACT How fast Web pages load and how fast they change dynamically depends on both the Web page and the browser it's running in. Browser makers put significant effort into making their browsers faster, but there are also things that Web page authors can do to make their pages more responsive. I plan to talk about HTML, CSS, and the DOM in Mozilla, from the DOM tree and CSS style sheets through to displaying pixels on the screen. In particular, what do Mozilla-based browsers spend the time doing when they're displaying a Web page? Which parts of this work are redone when the page is changed by script? And what implications does this have for how authors can make their pages faster, and for how authors can test the performance of their pages? Speaker: David Baron David is a software engineer at Mozilla Corporation, where he works on Mozilla's implementations of Cascading Style Sheets (CSS) and layout algorithms (computing the positions of objects), fixing memory leaks, and other things. He has been working on Mozilla since 1998, and is a member of the W3C CSS working group.
http://wn.com/Faster_HTML_and_CSS_Layout_Engine_Internals_for_Web_Developers
PSD to HTML Part 1
- Order: Reorder
- Duration: 10:00
- Published: 25 Jan 2009
- Updated: 02 Jul 2012
GFxCube.Net | An easy to follow photoshop/dreamweaver tutorial on coding a site from a PSD to HTML. Part 1 of 6. Earlier videos showed how to design this exact template being coded. Feel free to subscribe. PSD for template can be found at www.GFxCube.Net
http://wn.com/PSD_to_HTML_Part_1
Importance of HTML Headings for Accessibility
- Order: Reorder
- Duration: 8:42
- Published: 28 Jul 2008
- Updated: 01 Jul 2012
A brief demo and discussion of why HTML headings are so important for screenreader users.
http://wn.com/Importance_of_HTML_Headings_for_Accessibility
Is HTML validation necessary for ranking?
- Order: Reorder
- Duration: 2:02
- Published: 15 Mar 2011
- Updated: 01 Jul 2012
Hi Matt, in a previous video you stated that validation of HTML wasn't really important for ranking/SEO. This confuses me, would Google really want to send it's users to websites which would be broken for a lot of them? Jimmy "@Feldon" Wirsborg, Stockholm, Sweden Russian subtitles provided by Mike Shakin. Note: the grammatical error was fixed in the video, but the question as submitted can be seen above. Have a question? Ask it in our Webmaster Help Forum: www.google.com Want your question to be answered on a video like this? Follow us on Twitter and look for an announcement when we take new questions: twitter.com More videos: www.youtube.com Webmaster Central Blog: googlewebmastercentral.blogspot.com Webmaster Central: www.google.com
http://wn.com/Is_HTML_validation_necessary_for_ranking?
Slice and Export a Website Layout + HTML: Photoshop Tutorial!
- Order: Reorder
- Duration: 21:04
- Published: 23 Dec 2007
- Updated: 01 Jul 2012
Check this video out at Hi-Res here: www.tutvid.com Welcome to this video tutorial! We will learn how to take a Photoshop created web page layout template and slice it into individual pieces and then export it with an HTML file. We will cover user slices, layer based slices, auto slices, naming slices, assigning links to slices, alternate text for slices, creating multiple slices at one time, previewing our file in a web browser, saving individual slices as gifs or jpgs from the same document, and exporting a fully functional HTML file to go along with all of it. Please enjoy and don't forget to check out the site www.tutvid.com
http://wn.com/Slice_and_Export_a_Website_Layout_+_HTML_Photoshop_Tutorial!
Google I/O 2009 - Google's HTML 5 Work: What's Next?
- Order: Reorder
- Duration: 61:55
- Published: 29 May 2009
- Updated: 25 Jun 2012
Google I/O 2009 - Google's HTML 5 Work: What's Next? Matthew Papakipos Learn about new features in HTML 5 that enhance and enrich the web experience. Learn about new features in HTML 5, how they'll be supported in Chrome, and our latest plans for new functionality. The web browser is quickly evolving into a rich platform with access to all the capabilities that your computer has to offer. This talk will help you understand what is possible and how to write applications that use the latest APIs. For presentation slides and all I/O sessions, please go to: code.google.com/events/io/sessions.html
http://wn.com/Google_I_O_2009_Google's_HTML_5_Work_What's_Next?
How to Create a Facebook Landing Page (HTML / iFrame Edition)
- Order: Reorder
- Duration: 13:35
- Published: 09 Mar 2011
- Updated: 29 Jun 2012
www.smartpassiveincome.com - ***IMPORTANT*** Please note that on March 30th all Facebook Pages will be switched to the timeline format. Although they say Facebook landing pages are GONE, there is a workaround for a landing page in the timeline setup. Click the link below to get more information about timeline and the new landing page: www.smartpassiveincome.com
http://wn.com/How_to_Create_a_Facebook_Landing_Page_HTML_iFrame_Edition
HTML Tutorial 2 - Colours, Fonts, Backgrounds Website Design
- Order: Reorder
- Duration: 3:03
- Published: 17 Jan 2009
- Updated: 01 Jul 2012
In this HTML website design tutorial I will teach you how to change background and text colours/colors with microsoft notepad. Difficulty Level: Easy/Beginner If you have any problems or need help with any of this tutorial please leave a comment below or message me on YouTube.
http://wn.com/HTML_Tutorial_2_Colours,_Fonts,_Backgrounds_Website_Design
Google I/O 2011: Building Android Apps for Google TV
- Order: Reorder
- Duration: 56:36
- Published: 11 May 2011
- Updated: 01 Jul 2012
Jason Bayer, Christian Kurzke Learn how to create new apps or enhance existing Android apps for Google TV. Session includes an overview of the platform, best practices, demos, and discussion about the fantastic opportunities Google TV creates for developers.
http://wn.com/Google_I_O_2011_Building_Android_Apps_for_Google_TV
The Devil Wears Prada - HTML Rulez D00d (video)
- Order: Reorder
- Duration: 3:44
- Published: 12 Jul 2010
- Updated: 02 Jul 2012
itunes.apple.com www.facebook.com And yet i've been cleansed with the water. A purity no mind can grasp. A purity so cool upon my fingertips. The vision that i've seen: this is the action that spawns from the end. For the longest time, i've been watching the world breathe against (spiderwebs). What lies here are mountains composed of tombstones. Examine these beautiful faces, keep singing now. Keep singing. Will we push bedlam noise to the state of blissfulness? Display her beauty to the people. A purity no mind can grasp.
http://wn.com/The_Devil_Wears_Prada_HTML_Rulez_D00d_video
Web Page Tutorial #01: Basic HTML
- Order: Reorder
- Duration: 6:54
- Published: 08 Aug 2007
- Updated: 20 Jun 2012
This is an introduction to HTML using Notepad. While some prefer to use a WYSIWYG editor, HTML can be a great benefit if you want to modify your MySpace profile, embed video clips on your blog, etc.
http://wn.com/Web_Page_Tutorial_01_Basic_HTML
Introduction to HTML 5
- Order: Reorder
- Duration: 41:55
- Published: 22 Sep 2009
- Updated: 02 Jul 2012
Note: Higher quality version on Vimeo: vimeo.com Are you interested in HTML 5 and what's coming down the pipeline but haven't had time to read any articles yet? Brad Neuberg has put together an educational Introduction to HTML 5 video that goes over many of the major aspects of this new standard, including: * Web vector graphics with the Canvas tag and Scalable Vector Graphics (SVG) * The Geolocation API * HTML 5 Video * The HTML 5 Database and Application Cache * Web workers In the video we also crack open the HTML 5 YouTube Video prototype to show you some of the new HTML 5 tags, such as nav, article, etc. It's chock full of demos and sample source code.
http://wn.com/Introduction_to_HTML_5
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For the use of HTML on Wikipedia, see Help:HTML in wikitext.
| Filename extension | .html, .htm |
|---|---|
| Internet media type | text/html |
| Type code | TEXT |
| Uniform Type Identifier | public.html |
| Developed by | World Wide Web Consortium & WHATWG |
| Type of format | Markup language |
| Extended from | SGML |
| Extended to | XHTML |
| Standard(s) |
ISO/IEC 15445 |
HyperText Markup Language (HTML) is the main markup language for web pages. HTML elements are the basic building-blocks of webpages.
HTML is written in the form of HTML elements consisting of tags enclosed in angle brackets (like <html>), within the web page content. HTML tags most commonly come in pairs like <h1> and </h1>, although some tags, known as empty elements, are unpaired, for example <img>. The first tag in a pair is the start tag, the second tag is the end tag (they are also called opening tags and closing tags). In between these tags web designers can add text, tags, comments and other types of text-based content.
The purpose of a web browser is to read HTML documents and compose them into visible or audible web pages. The browser does not display the HTML tags, but uses the tags to interpret the content of the page.
HTML elements form the building blocks of all websites. HTML allows images and objects to be embedded and can be used to create interactive forms. It provides a means to create structured documents by denoting structural semantics for text such as headings, paragraphs, lists, links, quotes and other items. It can embed scripts in languages such as JavaScript which affect the behavior of HTML webpages.
Web browsers can also refer to Cascading Style Sheets (CSS) to define the appearance and layout of text and other material. The W3C, maintainer of both the HTML and the CSS standards, encourages the use of CSS over explicitly presentational HTML markup.[1]
Contents |
History[link]
Origins[link]
In 1980, physicist Tim Berners-Lee, who was a contractor at CERN, proposed and prototyped ENQUIRE, a system for CERN researchers to use and share documents. In 1989, Berners-Lee wrote a memo proposing an Internet-based hypertext system.[2] Berners-Lee specified HTML and wrote the browser and server software in the last part of 1990. In that year, Berners-Lee and CERN data systems engineer Robert Cailliau collaborated on a joint request for funding, but the project was not formally adopted by CERN. In his personal notes[3] from 1990 he lists[4] "some of the many areas in which hypertext is used" and puts an encyclopedia first.
First specifications[link]
The first publicly available description of HTML was a document called "HTML Tags", first mentioned on the Internet by Berners-Lee in late 1991.[5][6] It describes 18 elements comprising the initial, relatively simple design of HTML. Except for the hyperlink tag, these were strongly influenced by SGMLguid, an in-house SGML based documentation format at CERN. Eleven of these elements still exist in HTML 4.[7]
HyperText markup language is a markup language that web browsers use to interpret and compose text, images and other material into visual or audible web pages. Default characteristics for every item of HTML markup are defined in the browser, and these characteristics can be altered or enhanced by the web page designer's additional use of CSS. Many of the text elements are found in the 1988 ISO technical report TR 9537 Techniques for using SGML, which in turn covers the features of early text formatting languages such as that used by the RUNOFF command developed in the early 1960s for the CTSS (Compatible Time-Sharing System) operating system: these formatting commands were derived from the commands used by typesetters to manually format documents. However, the SGML concept of generalized markup is based on elements (nested annotated ranges with attributes) rather than merely print effects, with also the separation of structure and processing; HTML has been progressively moved in this direction with CSS.
Berners-Lee considered HTML to be an application of SGML. It was formally defined as such by the Internet Engineering Task Force (IETF) with the mid-1993 publication of the first proposal for an HTML specification: "Hypertext Markup Language (HTML)" Internet-Draft by Berners-Lee and Dan Connolly, which included an SGML Document Type Definition to define the grammar.[8] The draft expired after six months, but was notable for its acknowledgement of the NCSA Mosaic browser's custom tag for embedding in-line images, reflecting the IETF's philosophy of basing standards on successful prototypes.[9] Similarly, Dave Raggett's competing Internet-Draft, "HTML+ (Hypertext Markup Format)", from late 1993, suggested standardizing already-implemented features like tables and fill-out forms.[10]
After the HTML and HTML+ drafts expired in early 1994, the IETF created an HTML Working Group, which in 1995 completed "HTML 2.0", the first HTML specification intended to be treated as a standard against which future implementations should be based.[9] Published as Request for Comments 1866, HTML 2.0 included ideas from the HTML and HTML+ drafts.[11] The 2.0 designation was intended to distinguish the new edition from previous drafts.[12]
Further development under the auspices of the IETF was stalled by competing interests. Since 1996, the HTML specifications have been maintained, with input from commercial software vendors, by the World Wide Web Consortium (W3C).[13] However, in 2000, HTML also became an international standard (ISO/IEC 15445:2000). HTML 4.01 was published in late 1999, with further errata published through 2001. In 2004 development began on HTML5 in the Web Hypertext Application Technology Working Group (WHATWG), which became a joint deliverable with the W3C in 2008.
Version history of the standard[link]
HTML version timeline[link]
- November 24, 1995
- HTML 2.0 was published as IETF RFC 1866. Supplemental RFCs added capabilities:
- November 25, 1995: RFC 1867 (form-based file upload)
- May 1996: RFC 1942 (tables)
- August 1996: RFC 1980 (client-side image maps)
- January 1997: RFC 2070 (internationalization)
- January 1997
- HTML 3.2[14] was published as a W3C Recommendation. It was the first version developed and standardized exclusively by the W3C, as the IETF had closed its HTML Working Group in September 1996.[15]
- HTML 3.2 dropped math formulas entirely, reconciled overlap among various proprietary extensions and adopted most of Netscape's visual markup tags. Netscape's blink element and Microsoft's marquee element were omitted due to a mutual agreement between the two companies.[13] A markup for mathematical formulas similar to that in HTML was not standardized until 14 months later in MathML.
- December 1997
- HTML 4.0[16] was published as a W3C Recommendation. It offers three variations:
- Strict, in which deprecated elements are forbidden,
- Transitional, in which deprecated elements are allowed,
- Frameset, in which mostly only frame related elements are allowed;
- Initially code-named "Cougar",[17] HTML 4.0 adopted many browser-specific element types and attributes, but at the same time sought to phase out Netscape's visual markup features by marking them as deprecated in favor of style sheets. HTML 4 is an SGML application conforming to ISO 8879 – SGML.[18]
- April 1998
- HTML 4.0[19] was reissued with minor edits without incrementing the version number.
- December 1999
- HTML 4.01[20] was published as a W3C Recommendation. It offers the same three variations as HTML 4.0 and its last errata were published May 12, 2001.
- May 2000
- ISO/IEC 15445:2000[21][22] ("ISO HTML", based on HTML 4.01 Strict) was published as an ISO/IEC international standard. In the ISO this standard falls in the domain of the ISO/IEC JTC1/SC34 (ISO/IEC Joint Technical Committee 1, Subcommittee 34 – Document description and processing languages).ajmal[21]
- As of mid-2008, HTML 4.01 and ISO/IEC 15445:2000 are the most recent versions of HTML. Development of the parallel, XML-based language XHTML occupied the W3C's HTML Working Group through the early and mid-2000s.
HTML draft version timeline[link]
- October 1991
- HTML Tags,[5] an informal CERN document listing eighteen HTML tags, was first mentioned in public.
- June 1992
- First informal draft of the HTML DTD,[23] with seven[24][25][26] subsequent revisions (July 15, August 6, August 18, November 17, November 19, November 20, November 22)
- November 1992
- HTML DTD 1.1 (the first with a version number, based on RCS revisions, which start with 1.1 rather than 1.0), an informal draft[26]
- June 1993
- Hypertext Markup Language[27] was published by the IETF IIIR Working Group as an Internet-Draft (a rough proposal for a standard). It was replaced by a second version[28] one month later, followed by six further drafts published by IETF itself[29] that finally led to HTML 2.0 in RFC1866
- November 1993
- HTML+ was published by the IETF as an Internet-Draft and was a competing proposal to the Hypertext Markup Language draft. It expired in May 1994.
- April 1995 (authored March 1995)
- HTML 3.0[30] was proposed as a standard to the IETF, but the proposal expired five months later without further action. It included many of the capabilities that were in Raggett's HTML+ proposal, such as support for tables, text flow around figures and the display of complex mathematical formulas.[31]
- W3C began development of its own Arena browser as a test bed for HTML 3 and Cascading Style Sheets,[32][33][34] but HTML 3.0 did not succeed for several reasons. The draft was considered very large at 150 pages and the pace of browser development, as well as the number of interested parties, had outstripped the resources of the IETF.[13] Browser vendors, including Microsoft and Netscape at the time, chose to implement different subsets of HTML 3's draft features as well as to introduce their own extensions to it.[13] (See Browser wars) These included extensions to control stylistic aspects of documents, contrary to the "belief [of the academic engineering community] that such things as text color, background texture, font size and font face were definitely outside the scope of a language when their only intent was to specify how a document would be organized."[13] Dave Raggett, who has been a W3C Fellow for many years has commented for example, "To a certain extent, Microsoft built its business on the Web by extending HTML features."[13]
- January 2008
- HTML5 was published as a Working Draft (link) by the W3C.[35]
- Although its syntax closely resembles that of SGML, HTML5 has abandoned any attempt to be an SGML application and has explicitly defined its own "html" serialization, in addition to an alternative XML-based XHTML5 serialization.[36]
- May 2011
- On 14 February 2011, the W3C extended the charter of its HTML Working Group with clear milestones for HTML5. In May 2011, the working group advanced HTML5 to "Last Call", an invitation to communities inside and outside W3C to confirm the technical soundness of the specification. The W3C is developing a comprehensive test suite to achieve broad interoperability for the full specification by 2014, which is now the target date for Recommendation.[37]
XHTML versions[link]
Main article: XHTML
XHTML is a separate language that began as a reformulation of HTML 4.01 using XML 1.0. It continues to be developed:
- XHTML 1.0,[38] published January 26, 2000, as a W3C Recommendation, later revised and republished August 1, 2002. It offers the same three variations as HTML 4.0 and 4.01, reformulated in XML, with minor restrictions.
- XHTML 1.1,[39] published May 31, 2001, as a W3C Recommendation. It is based on XHTML 1.0 Strict, but includes minor changes, can be customized, is reformulated using modules from Modularization of XHTML, which was published April 10, 2001, as a W3C Recommendation.
- XHTML 2.0,.[40][41] There is no XHTML 2.0 standard. XHTML 2.0 is only a draft document and it is inappropriate to cite this document as other than work in progress. XHTML 2.0 is incompatible with XHTML 1.x and, therefore, would be more accurately characterized as an XHTML-inspired new language than an update to XHTML 1.x.
- XHTML5, which is an update to XHTML 1.x, is being defined alongside HTML5 in the HTML5 draft.[42]
Markup[link]
HTML markup consists of several key components, including elements (and their attributes), character-based data types, character references and entity references. Another important component is the document type declaration, which triggers standards mode rendering.
The following is an example of the classic Hello world program, a common test employed for comparing programming languages, scripting languages and markup languages. This example is made using 9 lines of code: <source lang="html4strict"> <!DOCTYPE html> <html>
<head> <title>Hello HTML</title> </head> <body>
Hello World!
</body>
</html> </source> (The text between <html> and </html> describes the web page, and the text between <body> and </body> is the visible page content. The markup text '<title>Hello HTML</title>' defines the browser tab title.)
This Document Type Declaration is for HTML5. If the <!DOCTYPE html> declaration is not included, various browsers will revert to "quirks mode" for rendering.[43]
Elements[link]
Main article: HTML element
HTML documents are composed entirely of HTML elements that, in their most general form have three components: a pair of tags, a "start tag" and "end tag"; some attributes within the start tag; and finally, any textual and graphical content between the start and end tags, perhaps including other nested elements. The HTML element is everything between and including the start and end tags. Each tag is enclosed in angle brackets.
The general form of an HTML element is therefore: <tag attribute1="value1" attribute2="value2">content</tag>. Some HTML elements are defined as empty elements and take the form <tag attribute1="value1" attribute2="value2" >. Empty elements may enclose no content, for instance, the BR tag or the inline IMG tag. The name of an HTML element is the name used in the tags. Note that the end tag's name is preceded by a slash character, "/", and that in empty elements the end tag is neither required nor allowed. If attributes are not mentioned, default values are used in each case.
Element examples[link]
Header of the HTML document:<head>...</head>. Usually the title should be included in the head, for example: <source lang="html4strict"> <head>
<title>The Title</title>
</head> </source> Headings: HTML headings are defined with the <h1> to <h6> tags: <source lang="html4strict">
Heading1
Heading2
Heading3
Heading4
Heading5
Heading6
</source>
Paragraphs:<source lang="html4strict">
Paragraph 1
Paragraph 2
</source>
Line breaks:<br>. The difference between <br> and <p> is that 'br' breaks a line without altering the semantic structure of the page, whereas 'p' sections the page into paragraphs. Note also that 'br' is an empty element in that, while it may have attributes, it can take no content and it may not have an end tag.
<source lang="html4strict">
This
is a paragraph
with
line breaks
</source>
Comments:<source lang="html4strict"></source> Comments can help understanding of the markup and do not display in the webpage.
There are several types of markup elements used in HTML.
- Structural markup describes the purpose of text
- For example,
<h2>Golf</h2>establishes "Golf" as a second-level heading. Structural markup does not denote any specific rendering, but most web browsers have default styles for element formatting. Content may be further styled using Cascading Style Sheets (CSS). - Presentational markup describes the appearance of the text, regardless of its purpose
- For example
<b>boldface</b>indicates that visual output devices should render "boldface" in bold text, but gives little indication what devices that are unable to do this (such as aural devices that read the text aloud) should do. In the case of both<b>bold</b>and<i>italic</i>, there are other elements that may have equivalent visual renderings but which are more semantic in nature, such as<strong>strong text</strong>and<em>emphasised text</em>respectively. It is easier to see how an aural user agent should interpret the latter two elements. However, they are not equivalent to their presentational counterparts: it would be undesirable for a screen-reader to emphasize the name of a book, for instance, but on a screen such a name would be italicized. Most presentational markup elements have become deprecated under the HTML 4.0 specification, in favor of using CSS for styling. - Hypertext markup makes parts of a document into links to other documents
- An anchor element creates a hyperlink in the document and its
hrefattribute sets the link's target URL. For example the HTML markup,<a href="http://www.google.com/">Wikipedia</a>, will render the word "Wikipedia" as a hyperlink. To render an image as a hyperlink, an 'img' element is inserted as content into the 'a' element. Like 'br', 'img' is an empty element with attributes but no content or closing tag.<a href="http://example.org"><img src="image.gif" alt="descriptive text" width="50" height="50" border="0"></a>.
Attributes[link]
Most of the attributes of an element are name-value pairs, separated by "=" and written within the start tag of an element after the element's name. The value may be enclosed in single or double quotes, although values consisting of certain characters can be left unquoted in HTML (but not XHTML).[44][45] Leaving attribute values unquoted is considered unsafe.[46] In contrast with name-value pair attributes, there are some attributes that affect the element simply by their presence in the start tag of the element,[5] like the ismap attribute for the img element.[47]
There are several common attributes that may appear in many elements:
- The
idattribute provides a document-wide unique identifier for an element. This is used to identify the element so that stylesheets can alter its presentational properties, and scripts may alter, animate or delete its contents or presentation. Appended to the URL of the page, it provides a globally unique identifier for the element, typically a sub-section of the page. For example, the ID "Attributes" inhttp://en.wikipedia.org/wiki/HTML#Attributes - The
classattribute provides a way of classifying similar elements. This can be used for semantic or presentation purposes. For example, an HTML document might semantically use the designationclass="notation"to indicate that all elements with this class value are subordinate to the main text of the document. In presentation, such elements might be gathered together and presented as footnotes on a page instead of appearing in the place where they occur in the HTML source. Class attributes are used semantically in microformats. Multiple class values may be specified; for exampleclass="notation important"puts the element into both the 'notation' and the 'important' classes. - An author may use the
styleattribute to assign presentational properties to a particular element. It is considered better practice to use an element'sidorclassattributes to select the element from within a stylesheet, though sometimes this can be too cumbersome for a simple, specific, or ad hoc styling. - The
titleattribute is used to attach subtextual explanation to an element. In most browsers this attribute is displayed as a tooltip. - The
langattribute identifies the natural language of the element's contents, which may be different from that of the rest of the document. For example, in an English-language document: <source lang="html4strict">Oh well, c'est la vie, as they say in France.
</source>
The abbreviation element, abbr, can be used to demonstrate some of these attributes:
<source lang="html4strict">HTML</source>
This example displays as HTML; in most browsers, pointing the cursor at the abbreviation should display the title text "Hypertext Markup Language."
Most elements also take the language-related attribute dir to specify text direction, such as with "rtl" for right-to-left text in, for examples, Arabic, Persian or Hebrew.[48]
Character and entity references[link]
As of version 4.0, HTML defines a set of 252 character entity references and a set of 1,114,050 numeric character references, both of which allow individual characters to be written via simple markup, rather than literally. A literal character and its markup counterpart are considered equivalent and are rendered identically.
The ability to "escape" characters in this way allows for the characters < and & (when written as < and &, respectively) to be interpreted as character data, rather than markup. For example, a literal < normally indicates the start of a tag, and & normally indicates the start of a character entity reference or numeric character reference; writing it as & or & or & allows & to be included in the content of an element or in the value of an attribute. The double-quote character ("), when not used to quote an attribute value, must also be escaped as " or " or " when it appears within the attribute value itself. Equivalently, the single-quote character ('), when used to quote an attribute value, must also be escaped as ' or ' (not as ' except in XHTML documents[49]) when it appears within the attribute value itself. If document authors overlook the need to escape such characters, some browsers can be very forgiving and try to use context to guess their intent. The result is still invalid markup, which makes the document less accessible to other browsers and to other user agents that may try to parse the document for search and indexing purposes for example.
Escaping also allows for characters that are not easily typed, or that are not available in the document's character encoding, to be represented within element and attribute content. For example, the acute-accented e (é), a character typically found only on Western European keyboards, can be written in any HTML document as the entity reference é or as the numeric references é or é, using characters that are available on all keyboards and are supported in all character encodings. Unicode character encodings such as UTF-8 are compatible with all modern browsers and allow direct access to almost all the characters of the world's writing systems.[50]
Data types[link]
HTML defines several data types for element content, such as script data and stylesheet data, and a plethora of types for attribute values, including IDs, names, URIs, numbers, units of length, languages, media descriptors, colors, character encodings, dates and times, and so on. All of these data types are specializations of character data.
Document type declaration[link]
HTML documents are required to start with a Document Type Declaration (informally, a "doctype"). In browsers, the doctype helps to define the rendering mode—particularly whether to use quirks mode.
The original purpose of the doctype was to enable parsing and validation of HTML documents by SGML tools based on the Document Type Definition (DTD). The DTD to which the DOCTYPE refers contains a machine-readable grammar specifying the permitted and prohibited content for a document conforming to such a DTD. Browsers, on the other hand, do not implement HTML as an application of SGML and by consequence do not read the DTD. HTML5 does not define a DTD, because of the technology's inherent limitations, so in HTML5 the doctype declaration, <!doctype html>, does not refer to a DTD.
An example of an HTML 4 doctype is
<source lang="html4strict"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> </source>
This declaration references the DTD for the 'strict' version of HTML 4.01. SGML-based validators read the DTD in order to properly parse the document and to perform validation. In modern browsers, a valid doctype activates standards mode as opposed to quirks mode.
In addition, HTML 4.01 provides Transitional and Frameset DTDs, as explained below.
Semantic HTML[link]
Main article: Semantic HTML
Semantic HTML is a way of writing HTML that emphasizes the meaning of the encoded information over its presentation (look). HTML has included semantic markup from its inception,[51] but has also included presentational markup such as <font>, <i> and <center> tags. There are also the semantically neutral span and div tags. Since the late 1990s when Cascading Style Sheets were beginning to work in most browsers, web authors have been encouraged to avoid the use of presentational HTML markup with a view to the separation of presentation and content.[52]
In a 2001 discussion of the Semantic Web, Tim Berners-Lee and others gave examples of ways in which intelligent software 'agents' may one day automatically trawl the Web and find, filter and correlate previously unrelated, published facts for the benefit of human users.[53] Such agents are not commonplace even now, but some of the ideas of Web 2.0, mashups and price comparison websites may be coming close. The main difference between these web application hybrids and Berners-Lee's semantic agents lies in the fact that the current aggregation and hybridisation of information is usually designed in by web developers, who already know the web locations and the API semantics of the specific data they wish to mash, compare and combine.
An important type of web agent that does trawl and read web pages automatically, without prior knowledge of what it might find, is the Web crawler or search-engine spider. These software agents are dependent on the semantic clarity of web pages they find as they use various techniques and algorithms to read and index millions of web pages a day and provide web users with search facilities without which the World Wide Web would be only a fraction of its current usefulness.
In order for search-engine spiders to be able to rate the significance of pieces of text they find in HTML documents, and also for those creating mashups and other hybrids as well as for more automated agents as they are developed, the semantic structures that exist in HTML need to be widely and uniformly applied to bring out the meaning of published text.[54]
Presentational markup tags are deprecated in current HTML and XHTML recommendations and are illegal in HTML5.
Good semantic HTML also improves the accessibility of web documents (see also Web Content Accessibility Guidelines). For example, when a screen reader or audio browser can correctly ascertain the structure of a document, it will not waste the visually impaired user's time by reading out repeated or irrelevant information when it has been marked up correctly.
Delivery[link]
HTML documents can be delivered by the same means as any other computer file. However, they are most often delivered either by HTTP from a web server or by email.
HTTP[link]
Main article: Hypertext Transfer Protocol
The World Wide Web is composed primarily of HTML documents transmitted from web servers to web browsers using the Hypertext Transfer Protocol (HTTP). However, HTTP is used to serve images, sound, and other content, in addition to HTML. To allow the Web browser to know how to handle each document it receives, other information is transmitted along with the document. This meta data usually includes the MIME type (e.g. text/html or application/xhtml+xml) and the character encoding (see Character encoding in HTML).
In modern browsers, the MIME type that is sent with the HTML document may affect how the document is initially interpreted. A document sent with the XHTML MIME type is expected to be well-formed XML; syntax errors may cause the browser to fail to render it. The same document sent with the HTML MIME type might be displayed successfully, since some browsers are more lenient with HTML.
The W3C recommendations state that XHTML 1.0 documents that follow guidelines set forth in the recommendation's Appendix C may be labeled with either MIME Type.[55] The current XHTML 1.1 Working Draft also states that XHTML 1.1 documents should[56] be labeled with either MIME type.[57]
HTML e-mail[link]
Main article: HTML email
Most graphical email clients allow the use of a subset of HTML (often ill-defined) to provide formatting and semantic markup not available with plain text. This may include typographic information like coloured headings, emphasized and quoted text, inline images and diagrams. Many such clients include both a GUI editor for composing HTML e-mail messages and a rendering engine for displaying them. Use of HTML in e-mail is controversial because of compatibility issues, because it can help disguise phishing attacks, because it can confuse spam filters and because the message size is larger than plain text.
Naming conventions[link]
The most common filename extension for files containing HTML is .html. A common abbreviation of this is .htm, which originated because some early operating systems and file systems, such as DOS and FAT, limited file extensions to three letters.
HTML Application[link]
Main article: HTML Application
An HTML Application (HTA; file extension ".hta") is a Microsoft Windows application that uses HTML and Dynamic HTML in a browser to provide the application's graphical interface. A regular HTML file is confined to the security model of the web browser's security, communicating only to web servers and manipulating only webpage objects and site cookies. An HTA runs as a fully trusted application and therefore has more privileges, like creation/editing/removal of files and Windows Registry entries. Because they operate outside the browser's security model, HTAs cannot be executed via HTTP, but must be downloaded (just like an EXE file) and executed from local file system.
Current variations[link]
HTML is precisely what we were trying to PREVENT— ever-breaking links, links going outward only, quotes you can't follow to their origins, no version management, no rights management.
Since its inception, HTML and its associated protocols gained acceptance relatively quickly. However, no clear standards existed in the early years of the language. Though its creators originally conceived of HTML as a semantic language devoid of presentation details,[59] practical uses pushed many presentational elements and attributes into the language, driven largely by the various browser vendors. The latest standards surrounding HTML reflect efforts to overcome the sometimes chaotic development of the language[60] and to create a rational foundation for building both meaningful and well-presented documents. To return HTML to its role as a semantic language, the W3C has developed style languages such as CSS and XSL to shoulder the burden of presentation. In conjunction, the HTML specification has slowly reined in the presentational elements.
There are two axes differentiating various variations of HTML as currently specified: SGML-based HTML versus XML-based HTML (referred to as XHTML) on one axis, and strict versus transitional (loose) versus frameset on the other axis.
SGML-based versus XML-based HTML[link]
One difference in the latest HTML specifications lies in the distinction between the SGML-based specification and the XML-based specification. The XML-based specification is usually called XHTML to distinguish it clearly from the more traditional definition. However, the root element name continues to be 'html' even in the XHTML-specified HTML. The W3C intended XHTML 1.0 to be identical to HTML 4.01 except where limitations of XML over the more complex SGML require workarounds. Because XHTML and HTML are closely related, they are sometimes documented in parallel. In such circumstances, some authors conflate the two names as (X)HTML or X(HTML).
Like HTML 4.01, XHTML 1.0 has three sub-specifications: strict, transitional and frameset.
Aside from the different opening declarations for a document, the differences between an HTML 4.01 and XHTML 1.0 document—in each of the corresponding DTDs—are largely syntactic. The underlying syntax of HTML allows many shortcuts that XHTML does not, such as elements with optional opening or closing tags, and even EMPTY elements which must not have an end tag. By contrast, XHTML requires all elements to have an opening tag and a closing tag. XHTML, however, also introduces a new shortcut: an XHTML tag may be opened and closed within the same tag, by including a slash before the end of the tag like this: <br/>. The introduction of this shorthand, which is not used in the SGML declaration for HTML 4.01, may confuse earlier software unfamiliar with this new convention. A fix for this is to include a space before closing the tag, as such: <br />.[61]
To understand the subtle differences between HTML and XHTML, consider the transformation of a valid and well-formed XHTML 1.0 document that adheres to Appendix C (see below) into a valid HTML 4.01 document. To make this translation requires the following steps:
- The language for an element should be specified with a
langattribute rather than the XHTMLxml:langattribute. XHTML uses XML's built in language-defining functionality attribute. - Remove the XML namespace (
xmlns=URI). HTML has no facilities for namespaces. - Change the document type declaration from XHTML 1.0 to HTML 4.01. (see DTD section for further explanation).
- If present, remove the XML declaration. (Typically this is:
<?xml version="1.0" encoding="utf-8"?>). - Ensure that the document's MIME type is set to
text/html. For both HTML and XHTML, this comes from the HTTPContent-Typeheader sent by the server. - Change the XML empty-element syntax to an HTML style empty element (
<br/>to<br>).
Those are the main changes necessary to translate a document from XHTML 1.0 to HTML 4.01. To translate from HTML to XHTML would also require the addition of any omitted opening or closing tags. Whether coding in HTML or XHTML it may just be best to always include the optional tags within an HTML document rather than remembering which tags can be omitted.
A well-formed XHTML document adheres to all the syntax requirements of XML. A valid document adheres to the content specification for XHTML, which describes the document structure.
The W3C recommends several conventions to ensure an easy migration between HTML and XHTML (see HTML Compatibility Guidelines). The following steps can be applied to XHTML 1.0 documents only:
- Include both
xml:langandlangattributes on any elements assigning language. - Use the empty-element syntax only for elements specified as empty in HTML.
- Include an extra space in empty-element tags: for example
<br />instead of<br/>. - Include explicit close tags for elements that permit content but are left empty (for example,
<div></div>, not<div />). - Omit the XML declaration.
By carefully following the W3C's compatibility guidelines, a user agent should be able to interpret the document equally as HTML or XHTML. For documents that are XHTML 1.0 and have been made compatible in this way, the W3C permits them to be served either as HTML (with a text/html MIME type), or as XHTML (with an application/xhtml+xml or application/xml MIME type). When delivered as XHTML, browsers should use an XML parser, which adheres strictly to the XML specifications for parsing the document's contents.
Transitional versus strict[link]
HTML 4 defined three different versions of the language: Strict, Transitional (once called Loose) and Frameset. The Strict version is intended for new documents and is considered best practice, while the Transitional and Frameset versions were developed to make it easier to transition documents that conformed to older HTML specification or didn't conform to any specification to a version of HTML 4. The Transitional and Frameset versions allow for presentational markup, which is omitted in the Strict version. Instead, cascading style sheets are encouraged to improve the presentation of HTML documents. Because XHTML 1 only defines an XML syntax for the language defined by HTML 4, the same differences apply to XHTML 1 as well.
The Transitional version allows the following parts of the vocabulary, which are not included in the Strict version:
- A looser content model
- Inline elements and plain text are allowed directly in:
body,blockquote,form,noscriptandnoframes
- Inline elements and plain text are allowed directly in:
- Presentation related elements
- underline (
u)(Deprecated. can confuse a visitor with a hyperlink.) - strike-through (
s) center(Deprecated. use CSS instead.)font(Deprecated. use CSS instead.)basefont(Deprecated. use CSS instead.)
- underline (
- Presentation related attributes
background(Deprecated. use CSS instead.) andbgcolor(Deprecated. use CSS instead.) attributes forbody(required element according to the W3C.) element.align(Deprecated. use CSS instead.) attribute ondiv,form, paragraph (p) and heading (h1...h6) elementsalign(Deprecated. use CSS instead.),noshade(Deprecated. use CSS instead.),size(Deprecated. use CSS instead.) andwidth(Deprecated. use CSS instead.) attributes onhrelementalign(Deprecated. use CSS instead.),border,vspaceandhspaceattributes onimgandobject(caution: theobjectelement is only supported in Internet Explorer (from the major browsers)) elementsalign(Deprecated. use CSS instead.) attribute onlegendandcaptionelementsalign(Deprecated. use CSS instead.) andbgcolor(Deprecated. use CSS instead.) ontableelementnowrap(Obsolete),bgcolor(Deprecated. use CSS instead.),width,heightontdandthelementsbgcolor(Deprecated. use CSS instead.) attribute ontrelementclear(Obsolete) attribute onbrelementcompactattribute ondl,dirandmenuelementstype(Deprecated. use CSS instead.),compact(Deprecated. use CSS instead.) andstart(Deprecated. use CSS instead.) attributes onolandulelementstypeandvalueattributes onlielementwidthattribute onpreelement
- Additional elements in Transitional specification
menu(Deprecated. use CSS instead.) list (no substitute, though unordered list is recommended)dir(Deprecated. use CSS instead.) list (no substitute, though unordered list is recommended)isindex(Deprecated.) (element requires server-side support and is typically added to documents server-side,formandinputelements can be used as a substitute)applet(Deprecated. use theobjectelement instead.)
- The
language(Obsolete) attribute on script element (redundant with thetypeattribute). - Frame related entities
iframenoframestarget(Deprecated in themap,linkandformelements.) attribute ona, client-side image-map (map),link,formandbaseelements
The Frameset version includes everything in the Transitional version, as well as the frameset element (used instead of body) and the frame element.
Frameset versus transitional[link]
In addition to the above transitional differences, the frameset specifications (whether XHTML 1.0 or HTML 4.01) specifies a different content model, with frameset replacing body, that contains either frame elements, or optionally noframes with a body.
Summary of specification versions[link]
As this list demonstrates, the loose versions of the specification are maintained for legacy support. However, contrary to popular misconceptions, the move to XHTML does not imply a removal of this legacy support. Rather the X in XML stands for extensible and the W3C is modularizing the entire specification and opening it up to independent extensions. The primary achievement in the move from XHTML 1.0 to XHTML 1.1 is the modularization of the entire specification. The strict version of HTML is deployed in XHTML 1.1 through a set of modular extensions to the base XHTML 1.1 specification. Likewise, someone looking for the loose (transitional) or frameset specifications will find similar extended XHTML 1.1 support (much of it is contained in the legacy or frame modules). The modularization also allows for separate features to develop on their own timetable. So for example, XHTML 1.1 will allow quicker migration to emerging XML standards such as MathML (a presentational and semantic math language based on XML) and XForms—a new highly advanced web-form technology to replace the existing HTML forms.
In summary, the HTML 4.01 specification primarily reined in all the various HTML implementations into a single clearly written specification based on SGML. XHTML 1.0, ported this specification, as is, to the new XML defined specification. Next, XHTML 1.1 takes advantage of the extensible nature of XML and modularizes the whole specification. XHTML 2.0 will be the first step in adding new features to the specification in a standards-body-based approach.
Hypertext features not in HTML[link]
HTML lacks some of the features found in earlier hypertext systems, such as typed links, source tracking, fat links and others.[62] Even some hypertext features that were in early versions of HTML have been ignored by most popular web browsers until recently, such as the link element and in-browser Web page editing.
Sometimes Web services or browser manufacturers remedy these shortcomings. For instance, wikis and content management systems allow surfers to edit the Web pages they visit.
WYSIWYG editors[link]
There are some WYSIWYG editors (What You See Is What You Get), in which the user lays out everything as it is to appear in the HTML document using a graphical user interface (GUI), where the editor renders this as an HTML document, no longer requiring the author to have extensive knowledge of HTML.
The WYSIWYG editing model has been criticized,[63][64] primarily because of the low quality of the generated code; there are voices advocating a change to the WYSIWYM model (What You See Is What You Mean).
WYSIWYG editors remains a controversial topic because of their perceived flaws such as:
- Relying mainly on layout as opposed to meaning, often using markup that does not convey the intended meaning but simply copies the layout.[65]
- Often producing extremely verbose and redundant code that fails to make use of the cascading nature of HTML and CSS.
- Often producing ungrammatical markup often called tag soup.
- As a great deal of the information in HTML documents is not in the layout, the model has been criticized for its 'what you see is all you get'-nature.[66]
Nevertheless, since WYSIWYG editors offer convenience over hand-coded pages as well as not requiring the author to know the finer details of HTML, they still dominate web authoring.[citation needed]
See also[link]
- Breadcrumb (navigation)
- CSS
- Dynamic web page
- HTML5
- HTML decimal character rendering
- HTTP
- List of document markup languages
- Microformat
- SGML
- XML
References[link]
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- ^ Tim Berners-Lee, "Design Issues"
- ^ Tim Berners-Lee, "Design Issues"
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- ^ a b Raymond, Eric. "IETF and the RFC Standards Process". The Art of Unix Programming. http://www.faqs.org/docs/artu/ietf_process.html. "In IETF tradition, standards have to arise from experience with a working prototype implementation — but once they become standards, code that does not conform to them is considered broken and mercilessly scrapped. ...Internet-Drafts are not specifications; software implementers and vendors are specifically barred from claiming compliance with them as if they were specifications. Internet-Drafts are focal points for discussion, usually in a working group... Once an Internet-Draft has been published with an RFC number, it is a specification to which implementers may claim conformance. It is expected that the authors of the RFC and the community at large will begin correcting the specification with field experience."
- ^ "HTML+ Internet-Draft — Abstract". https://datatracker.ietf.org/public/idindex.cgi?command=id_detail&id=789. "Browser writers are experimenting with extensions to HTML and it is now appropriate to draw these ideas together into a revised document format. The new format is designed to allow a gradual roll over from HTML, adding features like tables, captioned figures and fill-out forms for querying remote databases or mailing questionnaires."
- ^ Berners-Lee, Tim; Connolly, Dan (November 1995). "RFC 1866: Hypertext Markup Language – 2.0 – Acknowledgments". Internet Engineering Task Force. http://www.ietf.org/rfc/rfc1866.txt. Retrieved 1 December 2010. "Since 1993, a wide variety of Internet participants have contributed to the evolution of HTML, which has included the addition of in-line images introduced by the NCSA Mosaic software for WWW. Dave Raggett played an important role in deriving the forms material from the HTML+ specification. Dan Connolly and Karen Olson Muldrow rewrote the HTML Specification in 1994. The document was then edited by the HTML working group as a whole, with updates being made by Eric Schieler, Mike Knezovich and Eric W. Sink at Spyglass, Inc. Finally, Roy Fielding restructured the entire draft into its current form."
- ^ Berners-Lee, Tim; Connolly, Dan (November 1995). "RFC 1866: Hypertext Markup Language – 2.0 – Introduction". Internet Engineering Task Force. http://www.ietf.org/rfc/rfc1866.txt. Retrieved 1 December 2010. "This document thus defines an HTML 2.0 (to distinguish it from the previous informal specifications). Future (generally upwardly compatible) versions of HTML with new features will be released with higher version numbers."
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- ^ a b ISO (2000). "ISO/IEC 15445:2000 – Information technology – Document description and processing languages – HyperText Markup Language (HTML)". http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=27688. Retrieved December 26, 2009.
- ^ Cs.Tcd.Ie. Cs.Tcd.Ie (2000-05-15). Retrieved on 2012-02-16.
- ^ Connolly, Daniel (6 June 1992). "MIME as a hypertext architecture". CERN. http://lists.w3.org/Archives/Public/www-talk/1992MayJun/0020.html. Retrieved 24 October 2010.
- ^ Connolly, Daniel (15 July 1992). "HTML DTD enclosed". CERN. http://lists.w3.org/Archives/Public/www-talk/1992JulAug/0020.html. Retrieved 24 October 2010.
- ^ Connolly, Daniel (18 August 1992). "document type declaration subset for HyperText Markup Language as defined by the World Wide Web project". CERN. http://lost-contact.mit.edu/afs/cern.ch/w3.org/www/Frame/fminit2.0/html.dtd. Retrieved 24 October 2010.
- ^ a b Connolly, Daniel (24 November 1992). "Document Type Definition for the HyperText Markup Language as used by the World Wide Web application". CERN. http://lost-contact.mit.edu/afs/cern.ch/w3.org/www/MarkUp/Connolly/921125/archive.sh#html.dtd. Retrieved 24 October 2010. See section "Revision History"
- ^ Berners-Lee, Tim; Connolly, Daniel (June 1993). "Hypertext Markup Language (HTML) Internet Draft version 1.1". IETF IIIR Working Group. http://tools.ietf.org/html/draft-ietf-iiir-html-00. Retrieved 18 September 2010.
- ^ Berners-Lee, Tim; Connolly, Daniel (June 1993). "Hypertext Markup Language (HTML) Internet Draft version 1.2". IETF IIIR Working Group. http://www.w3.org/MarkUp/draft-ietf-iiir-html-01.txt. Retrieved 18 September 2010.
- ^ Berners-Lee, Tim; Connolly, Daniel (28 November 1994). "HyperText Markup Language Specification – 2.0 INTERNET DRAFT". IETF. http://tools.ietf.org/html/draft-ietf-html-spec-00. Retrieved 24 October 2010.
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- ^ Bowers, Neil. Weblint: Just Another Perl Hack. http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.54.7191.
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- ^ "HTML5". World Wide Web Consortium. June 10, 2008. http://www.w3.org/TR/html5/. Retrieved November 16, 2008.
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- ^ "W3C Confirms May 2011 for HTML5 Last Call, Targets 2014 for HTML5 Standard". World Wide Web Consortium. 14 February 2011. http://www.w3.org/2011/02/htmlwg-pr.html. Retrieved 18 February 2011.
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- ^ "The Named Character Reference '". World Wide Web Consortium. January 26, 2000. http://www.w3.org/TR/xhtml1/#C_16.
- ^ "The Unicode Standard: A Technical Introduction". http://www.unicode.org/standard/principles.html#. Retrieved 2010-03-16.
- ^ Berners-Lee, Tim; Fischetti, Mark (2000). Weaving the Web: The Original Design and Ultimate Destiny of the World Wide Web by Its Inventor. San Francisco: Harper. ISBN [[Special:BookSources/978-0-06-251587-X|978-0-06-251587-X]].
- ^ Raggett, Dave (2002). "Adding a touch of style". W3C. http://www.w3.org/MarkUp/Guide/Style.html. Retrieved October 2, 2009. This article notes that presentational HTML markup may be useful when targeting browsers "before Netscape 4.0 and Internet Explorer 4.0". See the list of web browsers to confirm that these were both released in 1997.
- ^ Tim Berners-Lee, James Hendler and Ora Lassila (2001). "The Semantic Web". Scientific American. http://www.scientificamerican.com/article.cfm?id=the-semantic-web. Retrieved October 2, 2009.
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- ^ Spiesser, J., Kitchen, L.: Optimization of html automatically generated by WYSIWYG programs. In: 13th International Conference on World Wide Web, pp. 355—364. WWW '04. ACM, New York, NY (New York, NY, U.S., May 17–20, 2004)
- ^ XHTML Reference: blockquote. Xhtml.com. Retrieved on 2012-02-16.
- ^ Doug Engelbart's INVISIBLE REVOLUTION. Invisiblerevolution.net. Retrieved on 2012-02-16.
External links[link]
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Wikimedia Commons has media related to: HTML |
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Wikibooks has a book on the topic of |
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Wikiversity has learning materials about HTML |
|
Wikiversity has learning materials about HTML Challenges |
 |
Look up Appendix:Hyper Text Markup Language in Wiktionary, the free dictionary. |
- HTML 4.01, the most recent finished specification (1999)
- HTML5, the upcoming version of HTML
- Dave Raggett's Introduction to HTML
- Empty elements in SGML, HTML, XML and XHTML
- Tim Berners-Lee Gives the Web a New Definition
- Comparison Matrix of HTML5-oriented Software
Tutorials
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EdzJohnson
HTML Tutorial 2 - Colours, Fonts, Backgrounds Website Design
In this HTML website design tutorial I will teach you how to change background and text colours/colors with microsoft notepad. Difficulty Level: Easy/Beginner If you have any problems or need help with any of this tutorial please leave a comment below or message me on YouTube.
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Google I/O 2011: Building Android Apps for Google TV
GoogleDevelopers
Google I/O 2011: Building Android Apps for Google TV
Jason Bayer, Christian Kurzke Learn how to create new apps or enhance existing Android apps for Google TV. Session includes an overview of the platform, best practices, demos, and discussion about the fantastic opportunities Google TV creates for developers.
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