Semantic HTML

semantic markupsemanticsemanticallysemantic implicationsemantic markup practicessemantically appropriate in Web typography
Semantic HTML is the use of HTML markup to reinforce the semantics, or meaning, of the information in webpages and web applications rather than merely to define its presentation or look.wikipedia
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Semantic Web

Web 3.0semanticsemantics
In 2001, Tim Berners-Lee participated in a discussion of the Semantic Web, where it was presented that intelligent software 'agents' might one day automatically trawl the Web and find, filter and correlate previously unrelated, published facts for the benefit of end users.
Semantic HTML refers to the traditional HTML practice of markup following intention, rather than specifying layout details directly.

HTML

Hypertext Markup LanguageHTML 3.2HTML 4
Semantic HTML is the use of HTML markup to reinforce the semantics, or meaning, of the information in webpages and web applications rather than merely to define its presentation or look.

Accessibility

accessiblelow-floorwheelchair accessible
Good semantic HTML also improves the accessibility of web documents (see also Web Content Accessibility Guidelines).

Microdata (HTML)

MicrodataHTML5 Microdata
Google specifies that that data may be given using microdata, microformats or RDFa.

Semantics

semanticsemanticallymeaning
Semantic HTML is the use of HTML markup to reinforce the semantics, or meaning, of the information in webpages and web applications rather than merely to define its presentation or look.

Web application

web-basedweb applicationsweb app
Semantic HTML is the use of HTML markup to reinforce the semantics, or meaning, of the information in webpages and web applications rather than merely to define its presentation or look.

Model–view–presenter

Model-view-presenterMVPModel View Presenter
Semantic HTML is the use of HTML markup to reinforce the semantics, or meaning, of the information in webpages and web applications rather than merely to define its presentation or look.

Web browser

browserweb browsersinternet browser
Semantic HTML is processed by traditional web browsers as well as by many other user agents.

User agent

user-agentuser agent stringuser agents
Semantic HTML is processed by traditional web browsers as well as by many other user agents.

Cascading Style Sheets

CSSCSS3Cascading Style Sheet
CSS is used to suggest its presentation to human users. 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.

Span and div

div and <div>
There are also the semantically neutral span and div elements.

Separation of content and presentation

separation of presentation and contentpresentationcontent and presentation
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.

Tim Berners-Lee

Sir Tim Berners-LeeTim Berners LeeTimothy Berners-Lee
In 2001, Tim Berners-Lee participated in a discussion of the Semantic Web, where it was presented that intelligent software 'agents' might one day automatically trawl the Web and find, filter and correlate previously unrelated, published facts for the benefit of end users.

Web 2.0

Enterprise 2.02.0Web2.0
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.

Mashup (web application hybrid)

mashupmashupsBusiness Mashups
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.

Comparison shopping website

price comparison serviceComparison Shopping Engineprice comparison website
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.

News aggregator

aggregatorfeed readerfeed aggregator
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.

Application programming interface

APIAPIsapplication programming interfaces
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.

Web crawler

web crawlingcrawlercrawling
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.

Algorithm

algorithmsalgorithm designcomputer algorithm
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.

Web search engine

search enginesearch enginesweb search
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.

Resource Description Framework

RDFResource Description Framework (RDF)RDF feed
While the true semantic web may depend on complex RDF ontologies and metadata, every HTML document makes its contribution to the meaningfulness of the Web by the correct use of headings, lists, titles and other semantic markup wherever possible.

Ontology (information science)

ontologyontologiesOntology (computer science)
While the true semantic web may depend on complex RDF ontologies and metadata, every HTML document makes its contribution to the meaningfulness of the Web by the correct use of headings, lists, titles and other semantic markup wherever possible.

Metadata

meta datameta-datacommunications metadata
While the true semantic web may depend on complex RDF ontologies and metadata, every HTML document makes its contribution to the meaningfulness of the Web by the correct use of headings, lists, titles and other semantic markup wherever possible.

Folksonomy

folksonomiessocial taggingfolksonomic
The correct use of Web 2.0 'tagging' creates folksonomies that may be equally or even more meaningful to many.