W3C markup validation tools

E29564

software tool web validation service suite

W3C markup validation tools are online and software-based services provided by the World Wide Web Consortium that check web documents for compliance with HTML, XHTML, and other web standards.

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All labels observed (4)

Label	Occurrences
W3C Link Checker	2
W3C Markup Validation Service	2
W3C markup validation tools canonical	1
W3C validators	1

How this entity was disambiguated

This entity first appeared as the object of triple T230336 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: W3C markup validation tools
Context triple: [Dave Raggett, contributedTo, W3C markup validation tools]

A. WHATWG
WHATWG is a community-driven standards organization that develops and maintains key web technologies, including the living standard for HTML.
B. XHTML
XHTML is a reformulation of HTML as an XML-based markup language designed to create structured, standards-compliant web pages.
C. HTML
HTML (HyperText Markup Language) is the standard markup language used to structure and present content on the World Wide Web.
D. HTML5
HTML5 is the fifth major version of the HyperText Markup Language standard, introducing modern web features such as semantic elements, native audio and video, and enhanced APIs for building rich, interactive web applications.
E. Schematron
Schematron is a rule-based XML schema language that uses XPath expressions to define and validate complex structural and business constraints in XML documents.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: W3C markup validation tools
Target entity description: W3C markup validation tools are online and software-based services provided by the World Wide Web Consortium that check web documents for compliance with HTML, XHTML, and other web standards.

A. WHATWG
WHATWG is a community-driven standards organization that develops and maintains key web technologies, including the living standard for HTML.
B. XHTML
XHTML is a reformulation of HTML as an XML-based markup language designed to create structured, standards-compliant web pages.
C. HTML
HTML (HyperText Markup Language) is the standard markup language used to structure and present content on the World Wide Web.
D. HTML5
HTML5 is the fifth major version of the HyperText Markup Language standard, introducing modern web features such as semantic elements, native audio and video, and enhanced APIs for building rich, interactive web applications.
E. Schematron
Schematron is a rule-based XML schema language that uses XPath expressions to define and validate complex structural and business constraints in XML documents.
F. None of above. chosen

Statements (51)

Predicate	Object
instanceOf	software tool ⓘ web validation service suite ⓘ
accessURL	https://jigsaw.w3.org/css-validator/ ⓘ https://validator.w3.org/ ⓘ
checks	CSS property and value validity ⓘ attribute value correctness ⓘ character encoding declarations ⓘ conformance to document type definition ⓘ document type declaration ⓘ syntax errors in markup ⓘ use of deprecated elements ⓘ
deploymentModel	downloadable software ⓘ online service ⓘ
implementsStandard	W3C CSS specifications ⓘ W3C HTML specifications ⓘ linked to: W3C Recommendation W3C MathML specifications ⓘ linked to: MathML W3C SVG specifications ⓘ linked to: SVG W3C XHTML specifications ⓘ linked to: XHTML W3C XML specifications ⓘ linked to: W3C Technical Reports
license	open source license ⓘ
maintainer	W3C Team ⓘ
output	error messages ⓘ validation report ⓘ warnings ⓘ
provider	World Wide Web Consortium ⓘ
purpose	check web documents for compliance with web standards ⓘ
relatedTool	W3C CSS Validation Service ⓘ linked to: W3C Unicorn W3C Link Checker ⓘ linked to: W3C markup validation tools W3C Markup Validation Service ⓘ linked to: W3C markup validation tools W3C Unicorn ⓘ
shortName	W3C validators ⓘ linked to: W3C markup validation tools
supportsAutomation	command-line usage ⓘ integration into build processes ⓘ
supportsInputMethod	URI input ⓘ direct markup input ⓘ file upload ⓘ
targetUser	QA engineers ⓘ web designers ⓘ web developers ⓘ
useCase	education about web standards ⓘ quality assurance for websites ⓘ web accessibility support ⓘ
validates	ARIA usage in markup ⓘ CSS ⓘ HTML ⓘ HTML5 ⓘ MathML ⓘ RDFa ⓘ SVG ⓘ XHTML ⓘ XML ⓘ

How these facts were elicited