HyperText Markup Language
".htm" and ".html" redirect here. For other uses, see
HTM
.
HyperText Markup Language
(
HTML
) is the standard
markup language
for documents designed to be displayed in a
web browser
. It defines the content and structure of
web content
. It is often assisted by technologies such as
Cascading Style Sheets
(CSS) and
scripting languages
such as
JavaScript
.
Web browsers
receive HTML documents from a
web server
or from local storage and
render
the documents into multimedia web pages. HTML describes the structure of a
web page
semantically
and originally included cues for its appearance.
HTML elements
are the building blocks of HTML pages. With HTML constructs,
images
and other objects such as
interactive forms
may be embedded into the rendered page. HTML provides a means to create
structured documents
by denoting structural
semantics
for text such as headings, paragraphs, lists,
links
, quotes, and other items. HTML elements are delineated by
tags
, written using
angle brackets
. Tags such as
<
img
>
and
<
input
>
directly introduce content into the page. Other tags such as
<
p
>
and
</
p
>
surround and provide information about document text and may include sub-element tags.
Browsers
do not display the HTML tags but use them to interpret the content of the page.
HTML can embed programs written in a
scripting language
such as
JavaScript
, which affects the behavior and content of web pages. The inclusion of CSS defines the look and layout of content. The
World Wide Web Consortium
(W3C), former maintainer of the HTML and current maintainer of the CSS standards, has encouraged the use of
CSS
over explicit presentational HTML since 1997.
[update]
[2]
A form of HTML, known as
HTML5
, is used to display video and audio, primarily using the
<
canvas
>
element, together with JavaScript.
History
Development
Tim Berners-Lee
in April 2009
In 1980,
physicist
Tim Berners-Lee
, 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.
[3]
Berners-Lee specified HTML and wrote the browser and server software in late 1990. 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 of 1990, Berners-Lee listed "some of the many areas in which hypertext is used"; an
encyclopedia
is the first entry.
[4]
The first publicly available description of HTML was a document called "HTML Tags",
[5]
first mentioned on the Internet by Tim Berners-Lee in late 1991.
[6]
[7]
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
Standard Generalized Markup Language
(SGML)-based documentation format at CERN. Eleven of these elements still exist in HTML 4.
[8]
HTML is a
markup language
that
web browsers
use to interpret and
compose
text, images, and other material into visible 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 mentioned in the 1988 ISO technical report TR 9537
Techniques for using SGML
, which describes 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 separate structure and markup. 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, the "Hypertext Markup Language (HTML)" Internet Draft by Berners-Lee and
Dan Connolly
, which included an SGML
Document type definition
to define the syntax.
[9]
[10]
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.
[11]
After the HTML and HTML+ drafts expired in early 1994, the IETF created an HTML Working Group. In 1995, this working group completed "HTML 2.0", the first HTML specification intended to be treated as a standard against which future implementations should be based.
[12]
Further development under the auspices of the IETF was stalled by competing interests. Since 1996,
[update]
the HTML specifications have been maintained, with input from commercial software vendors, by the
World Wide Web Consortium
(W3C).
[13]
In 2000, HTML 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, and was completed and standardized on 28 October 2014.
[14]
HTML version timeline
HTML 2
- November 24, 1995
- HTML 2.0 was published as
RFC
1866
. Supplemental
RFCs
added capabilities:
HTML 3
- January 14, 1997
- HTML 3.2
[15]
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 on September 12, 1996.
[16]
- Initially code-named "Wilbur",
[17]
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 of HTML was standardized 14 months later in
MathML
.
HTML 4
- December 18, 1997
- HTML 4.0
[18]
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 also 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.
[19]
- April 24, 1998
- HTML 4.0
[20]
was reissued with minor edits without incrementing the version number.
- December 24, 1999
- HTML 4.01
[21]
was published as a W3C Recommendation. It offers the same three variations as HTML 4.0 and its last errata
[22]
were published on May 12, 2001.
- May 2000
- ISO/IEC 15445:2000
[23]
("
ISO
HTML", based on HTML 4.01 Strict) was published as an ISO/IEC international standard.
[24]
In the ISO, this standard is in the domain of the
ISO/IEC JTC 1/SC 34
(ISO/IEC Joint Technical Committee 1, Subcommittee 34 ? Document description and processing languages).
[23]
- After HTML 4.01, there were no new versions of HTML for many years, as the development of the parallel, XML-based language XHTML occupied the W3C's HTML Working Group.
HTML 5
- October 28, 2014
- HTML5
[25]
was published as a W3C Recommendation.
[26]
- November 1, 2016
- HTML 5.1
[27]
was published as a W3C Recommendation.
[28]
[29]
- December 14, 2017
- HTML 5.2
[30]
was published as a W3C Recommendation.
[31]
[32]
HTML draft version timeline
- October 1991
- HTML Tags
,
[6]
an informal CERN document listing 18 HTML tags, was first mentioned in public.
- June 1992
- First informal draft of the HTML DTD,
[33]
with seven subsequent revisions (July 15, August 6, August 18, November 17, November 19, November 20, November 22)
[34]
[35]
[36]
- 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
[36]
- June 1993
- Hypertext Markup Language
[37]
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
[38]
one month later.
- 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 July 1994.
[39]
- November 1994
- First draft (revision 00) of HTML 2.0 published by IETF itself
[40]
(called as "HTML 2.0" from revision 02
[41]
), that finally led to the publication of
RFC
1866
in November 1995.
[42]
- April 1995 (authored March 1995)
- HTML 3.0
[43]
was proposed as a standard to the IETF, but the proposal expired five months later (28 September 1995)
[44]
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.
[44]
- W3C began development of its own
Arena browser
as a
test bed
for HTML 3 and Cascading Style Sheets,
[45]
[46]
[47]
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]
Logo of HTML5
- January 2008
- HTML5
was published as a
Working Draft
by the W3C.
[48]
- 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.
[49]
- 2011 HTML5 ? Last Call
- 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 developed a comprehensive test suite to achieve broad interoperability for the full specification by 2014, which was the target date for recommendation.
[50]
In January 2011, the WHATWG renamed its "HTML5" living standard to "HTML". The W3C nevertheless continues its project to release HTML5.
[51]
- 2012 HTML5 ? Candidate Recommendation
- In July 2012, WHATWG and
W3C
decided on a degree of separation. W3C will continue the HTML5 specification work, focusing on a single definitive standard, which is considered a "snapshot" by WHATWG. The WHATWG organization will continue its work with HTML5 as a "Living Standard". The concept of a living standard is that it is never complete and is always being updated and improved. New features can be added but functionality will not be removed.
[52]
- In December 2012, W3C designated HTML5 as a Candidate Recommendation.
[53]
The criterion for advancement to
W3C Recommendation
is "two 100% complete and fully interoperable implementations".
[54]
- 2014 HTML5 ? Proposed Recommendation and Recommendation
- In September 2014, W3C moved HTML5 to Proposed Recommendation.
[55]
- On 28 October 2014, HTML5 was released as a stable W3C Recommendation,
[56]
meaning the specification process is complete.
[57]
XHTML versions
XHTML is a separate language that began as a reformulation of HTML 4.01 using
XML
1.0. It is now referred to as
the XML syntax for HTML
and is no longer being developed as a separate standard.
[58]
- XHTML 1.0 was published as a W3C Recommendation on January 26, 2000,
[59]
and was later revised and republished on 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
[60]
was published as a W3C Recommendation on May 31, 2001. It is based on XHTML 1.0 Strict, but includes minor changes, can be customized, and is reformulated using modules in the W3C recommendation "Modularization of XHTML", which was published on April 10, 2001.
[61]
- XHTML 2.0 was a working draft. Work on it was abandoned in 2009 in favor of work on
HTML5
and
XHTML5
.
[62]
[63]
[64]
XHTML 2.0 was 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.
Transition of HTML publication to WHATWG
On 28 May 2019, the W3C announced that WHATWG would be the sole publisher of the HTML and DOM standards.
[65]
[66]
[67]
[68]
The W3C and WHATWG had been publishing competing standards since 2012. While the W3C standard was identical to the WHATWG in 2007 the standards have since progressively diverged due to different design decisions.
[69]
The WHATWG "Living Standard" had been the de facto web standard for some time.
[70]
Markup
HTML markup consists of several key components, including those called
tags
(and their
attributes
), character-based
data types
,
character references
and
entity references
. HTML tags most commonly come in pairs like
<
h1
>
and
</
h1
>
, although some represent
empty elements
and so are unpaired, for example
<
img
>
. The first tag in such a pair is the
start tag
, and the second is the
end tag
(they are also called
opening tags
and
closing tags
).
Another important component is the HTML
document type declaration
, which triggers
standards mode
rendering.
The following is an example of the classic
"Hello, World!" program
:
<!DOCTYPE html>
<
html
>
<
head
>
<
title
>
This is a title
</
title
>
</
head
>
<
body
>
<
div
>
<
p
>
Hello world!
</
p
>
</
div
>
</
body
>
</
html
>
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
>
This is a title
</
title
>
defines the browser page title shown on
browser tabs
and
window
titles and the tag
<
div
>
defines a division of the page used for easy styling. Between
<
head
>
and
</
head
>
, a
<
meta
>
element can be used to define webpage metadata.
The Document Type Declaration
<!DOCTYPE html>
is for HTML5. If a declaration is not included, various browsers will revert to "
quirks mode
" for rendering.
[71]
Elements
HTML element content categories
HTML documents imply a structure of nested
HTML elements
. These are indicated in the document by HTML
tags
, enclosed in angle brackets thus:
<
p
>
.
[72]
[
better source needed
]
In the simple, general case, the extent of an element is indicated by a pair of tags: a "start tag"
<
p
>
and "end tag"
</
p
>
. The text content of the element, if any, is placed between these tags.
Tags may also enclose further tag markup between the start and end, including a mixture of tags and text. This indicates further (nested) elements, as children of the parent element.
The start tag may also include the element's
attributes
within the tag. These indicate other information, such as identifiers for sections within the document, identifiers used to bind style information to the presentation of the document, and for some tags such as the
<
img
>
used to embed images, the reference to the image resource in the format like this:
<
img
src
=
"example.com/example.jpg"
>
Some elements, such as the
line break
<
br
>
do not permit
any
embedded content, either text or further tags. These require only a single empty tag (akin to a start tag) and do not use an end tag.
Many tags, particularly the closing end tag for the very commonly used paragraph element
<
p
>
, are optional. An HTML browser or other agent can infer the closure for the end of an element from the context and the structural rules defined by the HTML standard. These rules are complex and not widely understood by most HTML authors.
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.
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
Header of the HTML document:
<
head
>
...
</
head
>
. The title is included in the head, for example:
<
head
>
<
title
>
The Title
</
title
>
<
link
rel
=
"stylesheet"
href
=
"stylebyjimbowales.css"
>
<!-- Imports Stylesheets -->
</
head
>
Headings
HTML headings are defined with the
<
h1
>
to
<
h6
>
tags with H1 being the highest (or most important) level and H6 the least:
<
h1
>
Heading level 1
</
h1
>
<
h2
>
Heading level 2
</
h2
>
<
h3
>
Heading level 3
</
h3
>
<
h4
>
Heading level 4
</
h4
>
<
h5
>
Heading level 5
</
h5
>
<
h6
>
Heading level 6
</
h6
>
The effects are:
Heading Level 1
Heading Level 2
Heading Level 3
Heading Level 4
Heading Level 5
Heading Level 6
CSS can substantially change the rendering.
Paragraphs:
<
p
>
Paragraph 1
</
p
>
<
p
>
Paragraph 2
</
p
>
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
. The element
<
br
>
is an
empty element
in that, although it may have attributes, it can take no content and it may not have an end tag.
<
p
>
This
<
br
>
is a paragraph
<
br
>
with
<
br
>
line breaks
</
p
>
This is a link in HTML. To create a link the
<
a
>
tag is used. The
href
attribute holds the
URL
address of the link.
<
a
href
=
"https://www.wikipedia.org/"
>
A link to Wikipedia!
</
a
>
Inputs
There are many possible ways a user can give input/s like:
<
input
type
=
"text"
>
<!-- This is for text input -->
<
input
type
=
"file"
>
<!-- This is for uploading files -->
<
input
type
=
"checkbox"
>
<!-- This is for checkboxes -->
Comments:
<!-- This is a comment -->
Comments can help in the understanding of the markup and do not display in the webpage.
There are several types of markup elements used in HTML:
- Structural markup indicates 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).
[73]
- Presentational markup indicates the appearance of the text, regardless of its purpose
- For example,
<
b
>
bold text
</
b
>
indicates that visual output devices should render "boldface" in bold text, but gives a 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 text
</
b
>
and
<
i
>
italic text
</
i
>
, there are other elements that may have equivalent visual renderings but that are more semantic in nature, such as
<
strong
>
strong text
</
strong
>
and
<
em
>
emphasized 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
href
attribute sets the link's target
URL
. For example, the HTML markup
<
a
href
=
"https://en.wikipedia.org/"
>
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
=
"https://example.org"
><
img
src
=
"image.gif"
alt
=
"descriptive text"
width
=
"50"
height
=
"50"
border
=
"0"
></
a
>
.
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).
[74]
[75]
Leaving attribute values unquoted is considered unsafe.
[76]
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,
[6]
like the
ismap
attribute for the
img
element.
[77]
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
https://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. 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 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 a 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:
<
p
>
Oh well,
<
span
lang
=
"fr"
>
c'est la vie
</
span
>
, as they say in France.
</
p
>
The abbreviation element,
abbr
, can be used to demonstrate some of these attributes:
<
abbr
id
=
"anId"
class
=
"jargon"
style
=
"color:purple;"
title
=
"Hypertext Markup Language"
>
HTML
</
abbr
>
This example displays as
HTML
; in most browsers, pointing the cursor at the abbreviation should display the title text "Hypertext Markup Language."
Most elements take the language-related attribute
dir
to specify text direction, such as with "rtl" for right-to-left text in, for example,
Arabic
,
Persian
or
Hebrew
.
[78]
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 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 not used to quote an attribute value, must also be escaped as
'
or
'
(or as
'
in HTML5 or XHTML documents
[79]
[80]
) 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 the element and attribute content. For example, the acute-accented
e
(
e
), a character typically found only on Western European and South American 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.
[81]
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 the 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 as consequence do not read the DTD.
HTML5
does not define a DTD; therefore, in HTML5 the doctype declaration is simpler and shorter:
[82]
An example of an HTML 4 doctype
<!DOCTYPE
HTML
PUBLIC
"-//W3C//DTD HTML 4.01//EN"
"https://www.w3.org/TR/html4/strict.dtd"
>
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
. The transitional type is the most inclusive, incorporating current tags as well as older or "deprecated" tags, with the Strict DTD excluding deprecated tags. The frameset has all tags necessary to make frames on a page along with the tags included in transitional type.
[83]
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,
[84]
but has also included presentational markup, such as
<
font
>
,
<
i
>
and
<
center
>
tags. There are also the semantically neutral
div and span
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 content and presentation
.
[85]
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 crawl the web and find, filter, and correlate previously unrelated, published facts for the benefit of human users.
[86]
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 hybridization of information is usually designed 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 crawl 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's usefulness would be greatly reduced.
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 the published text.
[87]
Presentational markup tags are
deprecated
in current HTML and
XHTML
recommendations. The majority of presentational features from previous versions of HTML are no longer allowed as they lead to poorer accessibility, higher cost of site maintenance, and larger document sizes.
[88]
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 encodings 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.
[89]
XHTML 1.1 also states that XHTML 1.1 documents should
[90]
be labeled with either MIME type.
[91]
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 colored 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 criticized by some because of compatibility issues, because it can help disguise
phishing
attacks, because of accessibility issues for blind or visually impaired people, 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 the limitations imposed by
FAT
data structure, limited file extensions to
three letters
.
[92]
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 web page 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.
HTML4 variations
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,
[93]
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
[94]
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
[
when?
]
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
/>
.
[95]
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. Making 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:
<?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 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/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
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 specifications or did not 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
)(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.)
- Presentation related attributes
background
(Deprecated. use CSS instead.) and
bgcolor
(Deprecated. use CSS instead.) attributes for
body
(required element according to the W3C.) element.
align
(Deprecated. use CSS instead.) attribute on
div
,
form
, paragraph (
p
) and heading (
h1
...
h6
) elements
align
(Deprecated. use CSS instead.),
noshade
(Deprecated. use CSS instead.),
size
(Deprecated. use CSS instead.) and
width
(Deprecated. use CSS instead.) attributes on
hr
element
align
(Deprecated. use CSS instead.),
border
,
vspace
and
hspace
attributes on
img
and
object
(caution: the
object
element is only supported in Internet Explorer (from the major browsers)) elements
align
(Deprecated. use CSS instead.) attribute on
legend
and
caption
elements
align
(Deprecated. use CSS instead.) and
bgcolor
(Deprecated. use CSS instead.) on
table
element
nowrap
(Obsolete),
bgcolor
(Deprecated. use CSS instead.),
width
,
height
on
td
and
th
elements
bgcolor
(Deprecated. use CSS instead.) attribute on
tr
element
clear
(Obsolete) attribute on
br
element
compact
attribute on
dl
,
dir
and
menu
elements
type
(Deprecated. use CSS instead.),
compact
(Deprecated. use CSS instead.) and
start
(Deprecated. use CSS instead.) attributes on
ol
and
ul
elements
type
and
value
attributes on
li
element
width
attribute on
pre
element
- Additional elements in Transitional specification
menu
(Deprecated. use CSS instead.) list (no substitute, though the unordered list, is recommended)
dir
(Deprecated. use CSS instead.) list (no substitute, though the unordered list is recommended)
isindex
(Deprecated.) (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. use the
object
element instead.)
- The
language
(Obsolete) attribute on script element
(redundant with the
type
attribute).
- Frame related entities
iframe
noframes
target
(Deprecated in the
map
,
link
and
form
elements.) attribute on
a
, client-side image-map (
map
),
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) specify 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 opens 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). 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 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 was intended to be the first step in adding new features to the specification in a standards-body-based approach.
WHATWG HTML versus HTML5
The HTML Living Standard, which is developed by WHATWG, is the official version, while W3C HTML5 is no longer separate from WHATWG.
WYSIWYG editors
| This article
is missing information
about contenteditable.
Please expand the article to include this information. Further details may exist on the
talk page
.
(
January 2021
)
|
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), often similar to
word processors
. The editor renders the document rather than showing the code, so authors do not require extensive knowledge of HTML.
The WYSIWYG editing model has been criticized,
[96]
[97]
primarily because of the low quality of the generated code; there are voices
[
who?
]
advocating a change to the
WYSIWYM
model (What You See Is What You Mean).
WYSIWYG editors remain a controversial topic because of their perceived flaws such as:
- Relying mainly on the layout as opposed to meaning, often using markup that does not convey the intended meaning but simply copies the layout.
[98]
- Often producing extremely verbose and redundant code that fails to make use of the cascading nature of HTML and
CSS
.
- Often producing ungrammatical markup, called
tag soup
or semantically incorrect markup (such as
<
em
>
for italics).
- 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.
[99]
See also
References
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. World Wide Web Consortium. December 18, 1997.
Archived
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. Retrieved
July 6,
2015
.
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Tim Berners-Lee, "
Information Management: A Proposal
". CERN (March 1989, May 1990). W3C.
- ^
Berners-Lee, Tim.
"Intended Uses"
.
W3C
.
- ^
"Tags used in HTML"
.
info.cern.ch
. October 1991
. Retrieved
2 March
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a
b
c
"Tags used in HTML"
. World Wide Web Consortium. November 3, 1992.
Archived
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. Retrieved
November 16,
2008
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Berners-Lee, Tim (October 29, 1991).
"Re: status. Re: X11 BROWSER for WWW"
. World Wide Web Consortium.
Archived
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. Retrieved
April 8,
2007
.
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. World Wide Web Consortium. December 24, 1999.
Archived
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. Retrieved
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2007
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Berners-Lee, Tim (December 9, 1991).
"Re: SGML/HTML docs, X Browser"
.
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Archived
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SGML is very general. HTML is a specific application of the SGML basic syntax applied to hypertext documents with simple structure.
- ^
Berners-Lee, Tim; Connolly, Daniel (June 1993).
"Hypertext Markup Language (HTML): A Representation of Textual Information and MetaInformation for Retrieval and Interchange"
.
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Raggett, Dave
.
"A Review of the HTML+ Document Format"
.
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.
Archived
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. Retrieved
May 22,
2020
.
The hypertext markup language HTML was developed as a simple non-proprietary delivery format for global hypertext. HTML+ is a set of modular extensions to HTML and has been developed in response to a growing understanding of the needs of information providers. These extensions include text flow around floating figures, fill-out forms, tables, and mathematical equations.
- ^
Berners-Lee, Tim
; Connolly, Daniel W. (November 1995).
Hypertext Markup Language - 2.0
. Network Working Group.
doi
:
10.17487/RFC1866
.
RFC
1866
.
Historic.
Obsoleted by
RFC
2854
.
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.
- ^
a
b
c
d
e
f
Raggett, Dave (1998).
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. Archived from
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on August 9, 2007
. Retrieved
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2007
.
- ^
"HTML5 ? Hypertext Markup Language ? 5.0"
. Internet Engineering Task Force. 28 October 2014.
Archived
from the original on October 28, 2014
. Retrieved
November 25,
2014
.
This document recommends HTML 5.0 after completion.
- ^
"HTML 3.2 Reference Specification"
. World Wide Web Consortium. January 14, 1997
. Retrieved
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2008
.
- ^
"IETF HTML WG"
. Retrieved
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2007
.
Note: This working group is closed
- ^
a
b
Engelfriet, Arnoud
.
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.
htmlhelp.com
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2007
.
- ^
"HTML 4.0 Specification"
. World Wide Web Consortium. December 18, 1997
. Retrieved
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2008
.
- ^
"HTML 4 ? 4 Conformance: requirements and recommendations"
. Retrieved
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2009
.
- ^
"HTML 4.0 Specification"
. World Wide Web Consortium. April 24, 1998
. Retrieved
November 16,
2008
.
- ^
"HTML 4.01 Specification"
. World Wide Web Consortium. December 24, 1999
. Retrieved
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2008
.
- ^
"HTML 4 Errata"
. W3C
. Retrieved
March 2,
2023
.
- ^
a
b
ISO (2000).
"ISO/IEC 15445:2000 ? Information technology ? Document description and processing languages ? HyperText Markup Language (HTML)"
. Retrieved
March 1,
2023
.
- ^
"ISO/IEC 15445:2000(E) ISO-HTML"
.
www.scss.tcd.ie
. Geneva, CH: ISO/IEC. May 15, 2000
. Retrieved
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2023
.
- ^
"HTML5: A vocabulary and associated APIs for HTML and XHTML"
. World Wide Web Consortium. 28 October 2014
. Retrieved
31 October
2014
.
- ^
"Open Web Platform Milestone Achieved with HTML5 Recommendation"
(Press release). World Wide Web Consortium. 28 October 2014
. Retrieved
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2014
.
- ^
"HTML 5.1"
. World Wide Web Consortium. 1 November 2016
. Retrieved
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2017
.
- ^
"HTML 5.1 is a W3C Recommendation"
. World Wide Web Consortium. 1 November 2016
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2017
.
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Philippe le Hegaret (17 November 2016).
"HTML 5.1 is the gold standard"
. World Wide Web Consortium
. Retrieved
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2017
.
- ^
"HTML 5.2"
. World Wide Web Consortium. 14 December 2017
. Retrieved
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2017
.
- ^
"HTML 5.2 is now a W3C Recommendation"
. World Wide Web Consortium. 14 December 2017
. Retrieved
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2017
.
- ^
Charles McCathie Nevile (14 December 2017).
"HTML 5.2 is done, HTML 5.3 is coming"
. World Wide Web Consortium
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2017
.
- ^
Connolly, Daniel
(6 June 1992).
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. CERN
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Connolly, Daniel
(15 July 1992).
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. CERN
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.
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Connolly, Daniel
(18 August 1992).
"document type declaration subset for Hyper Text Markup Language as defined by the World Wide Web project"
. CERN. Archived from
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on 14 March 2012
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2010
.
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a
b
Connolly, Daniel
(24 November 1992).
"Document Type Definition for the Hyper Text Markup Language as used by the World Wide Web application"
. CERN. Archived from
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on 18 January 2012
. Retrieved
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See section "Revision History"
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;
Connolly, Daniel
(June 1993).
"Hyper Text Markup Language (HTML) Internet-Draft version 1.1"
. IETF IIIR Working Group
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2010
.
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Berners-Lee, Tim
;
Connolly, Daniel
(June 1993).
"Hypertext Markup Language (HTML) Internet-Draft version 1.2"
. IETF IIIR Working Group
. Retrieved
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2010
.
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Raggett, Dave (1993-11-08).
"History for draft-raggett-www-html-00"
.
IETF Datatracker
. Retrieved
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.
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Berners-Lee, Tim
;
Connolly, Daniel
(28 November 1994).
"HyperText Markup Language Specification ? 2.0 INTERNET DRAFT"
.
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Connolly, Daniel W. (1995-05-16).
"Hypertext Markup Language - 2.0"
.
tools.ietf.org
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.
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Berners-Lee, Tim
; Connolly, Daniel W. (November 1995).
Hypertext Markup Language - 2.0
. Network Working Group.
doi
:
10.17487/RFC1866
.
RFC
1866
.
Historic.
Obsoleted by
RFC
2854
.
- ^
"HTML 3.0 Draft (Expired!) Materials"
. World Wide Web Consortium. December 21, 1995
. Retrieved
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2008
.
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a
b
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. Retrieved
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.
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.
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.
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Bowers, N. (1998).
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(PDF)
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