| icon =
| alt = HTML
| screenshot =
| extension = .html, .htm
| mime = text/html
| type code = TEXT
| uniform type = public.html
| owner = World Wide Web Consortium & WHATWG
| genre = Markup language
| container for =
| contained by =
| extended from = SGML
| extended to = XHTML
| standard = ISO/IEC 15445 W3C HTML 4.01 W3C HTML 5 (draft)
}}
HTML, which stands for HyperText Markup Language, is the predominant markup language for web pages. It is written in the form of HTML elements consisting of "tags" surrounded by angle brackets within the web page content. It is the building blocks of all basic websites.
It 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.
HTML can also be used to include Cascading Style Sheets (CSS) to define the appearance and layout of text and other material. The W3C, maintainer of both HTML and CSS standards, encourages the use of CSS over explicit presentational markup.
History
Origins
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. 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 from 1990 he lists "some of the many areas in which hypertext is used" and puts an encyclopedia first.
First specifications
The first publicly available description of HTML was a document called HTML Tags, first mentioned on the Internet by Berners-Lee in late 1991. It describes 20 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. Thirteen of these elements still exist in HTML 4.
HTML is a text and image formatting language used by web browsers to dynamically format web pages. 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. The draft expired after six months, but was notable for its acknowledgment of the NCSA Mosaic browser's custom tag for embedding in-line images, reflecting the IETF's philosophy of basing standards on successful prototypes. 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.
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. The 2.0 designation was intended to distinguish the new edition from previous drafts.
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). However, in 2000, HTML also became an international standard (ISO/IEC 15445:2000). The last HTML specification published by the W3C is the HTML 4.01 Recommendation, published in late 1999. Its issues and errors were last acknowledged by errata published in 2001.
Version history of the standard
HTML version timeline
; 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)
:In June 2000, all of these were declared obsolete/historic by RFC 2854.
; January 1997: HTML 3.2 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.
: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. 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", 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.
; April 1998: HTML 4.0 was reissued with minor edits without incrementing the version number.
; December 1999: HTML 4.01 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 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). 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 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 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.
:W3C began development of its own Arena browser as a test bed for HTML 3 and Cascading Style Sheets, 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.
:Although its syntax closely resembles that of SGML, HTML 5 has abandoned any attempt to be an SGML application and has explicitly defined its own "html" serialization, in addition to an alternative XML-based XHTML 5 serialization.
XHTML versions
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, 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, 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,. There is no XHTML 2.0 standard. XHTML 2.0 is incompatible with XHTML 1.x and, therefore, would be more accurate to characterize as an XHTML-inspired new language than an update to XHTML 1.x.
XHTML 5, which is an update to XHTML 1.x, is being defined alongside HTML 5 in the HTML 5 draft.
Markup
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 specifies the Document Type Definition. As of HTML 5, no Document Type Definition will need to be specified and will only determine the layout mode.
If the declaration is not included, Windows Internet Explorer will render using "quirks mode".
Elements
HTML documents are composed entirely of HTML elements that,
in their most general form have three components:
a pair of element tags, a "start tag" and "end tag";
some element attributes within the start tag;
and finally, any textual and graphical content between the start and end tags.
The HTML element is everything between and including the tags.
Each tag is enclosed in angle brackets.
The general form of an HTML element is therefore:
content to be rendered
The name of the HTML element is also the name of the tag.
Note that the end tag's name is preceded by a slash character, "/".
If attributes are not assigned, default values are used.
Element examples
Header of the HTML document:.... Usually the title should be included in the head, for example:
The title
Headings:
Heading1
Heading2
Heading3
Heading4
Heading5
Heading6
Paragraphs:
Paragraph 1
Paragraph 2
Line breaks: . The difference between and 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 or end tag.
This is a paragraph with line breaks
Comments: 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,
Golf
establishes "Golf" as a second-level heading, which would be rendered in a browser in a manner similar to the "HTML markup" title at the start of this section. Structural markup does not denote any specific rendering, but most web browsers have default styles for element formatting. Text may be further styled with Cascading Style Sheets (CSS).
Presentational markup describes the appearance of the text, regardless of its purpose. For example boldface indicates that visual output devices should render "boldface" in bold text, but gives little indication what devices which are unable to do this (such as aural devices that read the text aloud) should do. In the case of both bold and italic, there are other elements that may have equivalent visual renderings but which are more semantic in nature, such as strong emphasis and emphasis 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 CSS based styling.
Hypertext markup makes parts of a document into links to other documents. An anchor element creates a hyperlink in the document with the href attribute set to the link URL. For example, the HTML markup, Wikipedia, 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. .
Attributes
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). Leaving attribute values unquoted is considered unsafe. 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, like the ismap attribute for the img element.
There are several common attributes that may appear in many elements:
* The id attribute 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" in http://en.wikipedia.org/wiki/HTML#Attributes
The class attribute 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 designation class="notation" to indicate that all elements with this class value are subordinate to the main text of the document. Presentationally, 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 example class="notation important" puts the element into both the 'notation' and the 'important' classes.
An author may use the style attribute to assign presentational properties to a particular element. It is considered better practice to use an element’s id or class attributes to select the element from within a stylesheet, though sometimes this can be too cumbersome for a simple, specific, or ad hoc styling.
The title attribute is used to attach subtextual explanation to an element. In most browsers this attribute is displayed as a tooltip.
The lang attribute 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:
Oh well, c'est la vie, as they say in France.
The abbreviation element, abbr, can be used to demonstrate some of these attributes:
HTML
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 example, Arabic or Hebrew.
Character and entity references
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 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) 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.
Data types
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
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. HTML 5 does not define a DTD, because of the technology's inherent limitations, so in HTML 5 the doctype declaration, <!doctype html>, does not refer to a DTD.
An example of an HTML 4 doctype is
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
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, 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.
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. 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.
Presentational markup tags are deprecated in current HTML and XHTML recommendations and are illegal in HTML 5.
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
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
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. The current XHTML 1.1 Working Draft also states that XHTML 1.1 documents should be labeled with either MIME type.
HTML e-mail
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
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 , limited file extensions to three letters.
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, 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
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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, 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 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
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, loose 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 />.
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 lang attribute rather than the XHTML xml:lang attribute. 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: ).
# Ensure that the document’s MIME type is set to text/html. For both HTML and XHTML, this comes from the HTTP Content-Type header 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:lang and lang attributes 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/htmlMIME 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
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, noscript and noframes
Presentation related elements
* underline (u)
* strike-through (s)
* center
* font
* basefont
Presentation related attributes
* background and bgcolor attributes for body element.
* align attribute on div, form, paragraph (p) and heading (h1...h6) elements
* align, noshade, size and width attributes on hr element
* align, border, vspace and hspace attributes on img and object elements
* align attribute on legend and caption elements
* align and bgcolor on table element
* nowrap, bgcolor, width, height on td and th elements
* bgcolor attribute on tr element
* clear attribute on br element
* compact attribute on dl, dir and menu elements
* type, compact and start attributes on ol and ul elements
* type and value attributes on li element
* width attribute on pre element
Additional elements in Transitional specification
* menu list (no substitute, though unordered list is recommended)
* dir list (no substitute, though unordered list is recommended)
* isindex (element requires server-side support and is typically added to documents server-side, form and input elements can be used as a substitute)
* applet (deprecated in favor of object element)
The language attribute on script element (redundant with the type attribute).
Frame related entities
* iframe
* noframes
* target attribute on anchor, client-side image-map (imagemap), link, form and base elements
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
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
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
HTML lacks some of the features found in earlier hypertext systems, such as typed links, source tracking, fat links and others. 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
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, 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, primarily because of the low quality of the generated code; there are voices advocating a change to the WYSIWYM model.
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.
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 information of HTML documents is not in the layout, the model has been criticized for its 'what you see is all you get'-nature.
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.
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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.
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.
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.
A PHP and HTML Tutorial in which we processes information from a form using the $_POST[]; functions in PHP and created a table and form. Link for Notepad2: www.flos-freeware.ch
HTML 5: Features you want desperately but still can't use
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.
Faster HTML and CSS: Layout Engine Internals for Web Developers
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.
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.
Google I/O 2009 - Google's HTML 5 Work: What's Next?
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
Slice and Export a Website Layout + HTML: Photoshop Tutorial!
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
HTML Tutorial 3 - Adding Images & Backgrounds To Your HTML Website
In this HTML website design tutorial I will teach you how to add images to your website/html document and how to add an image to the background. 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.
In this HTML website design tutorial I will teach you how to add links to text and images. I will also show you how to make a very simple menu bar using text style. Difficulty Level: Medium/Intermediate If you have any problems or need help with any of this tutorial please leave a comment below or message me on YouTube.
Released during the jQuery Conference 2010 by Team Dextrose! Here are the slides from the Presentation at jQuery Conference 2010 by Paul Bakaus: www.slideshare.net If you want to stay up to date with Aves Engine News you may want to follow twitter.com (english) or twitter.com (german) The Aves Engine is a software development kit to generate spectacular browsergames without the need for third-party plugins like Microsoft Silverlight or Adobe Flash on the end-user side. Highly inspired by Game Engines from the PC and Videogame-Industry, Aves-Engine is aimed toward serious browsergame publishers and game studios who want to benefit from a component based engine architecture and cross-plattform compatible code to deliver high quality games on any desktop operating system or mobile devices. The video shows some scenes and features put together based on the early alpha built of the engine. It shows some nice unique techniques in the frontend rendering, however, this is only a very small portion of what the Aves Engine is really about. We are in the early stages of the development but are happy to show interested investors, gamestudios and publishers working prototypes of the game engine to demonstrate performance and commercial prospects. check out www.dextrose.com for more infos or send mail to contact@dextrose.com
Build Native iPhone Apps with HTML, CSS, JavaScript and PhoneGap
Quick overview of how to take a garden variety web app built with HTML, CSS, JavaScript and convert it to a native iPhone app using PhoneGap. In this example, I used jQTouch to style and animated the web app, but this would work with any web app or JavaScript framework. You can learn more about building iPhone apps with HTML, CSS, and JavaScript here: building-iphone-apps.labs.oreilly.com Related links: phonegap.com jqtouch.com jonathanstark.com oreilly.com
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.
Adobe has just released the HTML 5 compatibility Pack for Dreamweaver CS5. With this Extension to Dreamweaver you can author HTML 5 compatible sites TODAY for the desktop, tablets and smartphones.
Frostie can dance the socks off any bird on this planet! Frostie's Facebook Fan Page: www.facebook.com Frostie is a 21-year-old Bare-Eyed Cockatoo, otherwise known as a Little Corella, a parrot native to Australia. (Video by Karla K. Larsson - Paradise - California - USA - February 1, 2009.)
Active Pixel Sensor in the Palm of your Hand (Nasa Photo) KLeo
photo: WN / vanster
Samsung’s Galaxy Apollo smartphone is coming soon, looks like an M100S to us Read more: http://geeklove2rock.blogspot.com/2010/06/samsungs-galaxy-apollo-smartphone-is.html#ixzz0qeM1PAgY
photo: Nasa Photo
JPL Director Dr. Edward C. Stone and Jacobs Engineering Group Founder, Chairman Joseph Jacobs, who founded Jacobs Engineering Group, Inc. (Nasa Photo) KLeo
By Elisabeth Robson April 17, 2010 | Comments: 0 In my previous post, I showed how you can use JavaScript to detect orientation and style your iPhone and iPad pages. As reader Jason Grigsby kindly...
html; charset=utf-8" http-equiv="Content-Type">html1\01\clip_filelist.xml" rel="File-List" />APPLE iPAD doesn’t support Flash. Can that be a deterrent for the millions of customers who...
The ExaminerPreamble Inflation Calculator was started as an educational project to demonstrate the power of emerging Internet standards and techniques, namely: HTML 5 and CSS 3, accompanied by increasingly popular jQuery extension to JavaScript. Though it is intended predominantly for the didactic purpose, it could also find some practical use for the “custom” annualized inflation...
![Lightning Ridge is a town in north-western New South Wales, Australia, in Walgett Shire, near the southern border of Queensland. At the 2006 census, Lightning Ridge had a population of 2,602 people.[1]Lightning Ridge is a world epicentre of the mining of black opals and other opal gemstones. Lightning Ridge has the largest known deposits of black opals in the world.](http://web.archive.org./web/20110108021141im_/http://cdn.wn.com/ph/img/0b/5f/a398a6babcac50d9ad64fb065880-thumb.jpg "Lightning Ridge is a town in north-western New South Wales, Australia, in Walgett Shire, near the southern border of Queensland. At the 2006 census, Lightning Ridge had a population of 2,602 people.[1]Lightning Ridge is a world epicentre of the mining of black opals and other opal gemstones. Lightning Ridge has the largest known deposits of black opals in the world."){kind=small}