View source for W3C Markup Validation Service

The '''Markup Validation Service''' is a validator by the [[World Wide Web Consortium]] (W3C) that allows [[Internet]] users to check [[HTML]] and [[XHTML]] documents for well-formed markup.

Markup validation is an important step towards ensuring the technical quality of web pages. However, it is not a complete measure of web standards conformance.

Though W3C validation is important for browser compatibility and site usability, it has not been confirmed what effect it has on search engine optimization.

== See also ==

* [[Markup validation]]
* [[Validation]]

== External links ==

* [https://validator.w3.org/ Markup Validation Service] @ W3C
* [http://jigsaw.w3.org/css-validator/ CSS Validation Service] @ W3C
* [https://en.wikipedia.org/wiki/W3C_Markup_Validation_Service W3C Markup Validation Service] @ Wikipedia

[[Category:Cascading Style Sheets]]
[[Category:Web design and development]]