html markup xhtml css Links validation

The present section is dedicated to on-line or local validators for the validation of html markup, xhtml, xml, css, links or accessibility.

The World Wide Web Consortium (W3C) is in charge with the standardization of our exchanges through the Internet network, in particular the publication of the HTML and XML language specifications, as well as the DOM (document object model), or stylesheets, etc.

The specifications defined by the World Wide Web Consortium (W3C) are mandatory. The browser learn from the DOCTYPE declaration of a Web page the specification that the page declares to conform with. Then the browser tries to display the page following the specifique specification. All the specifications are available at the W3C website (http://www.w3c.org/)

Shall you need more information about the validation process or the structure of an html page, please see our article on validation

  1. html, xhtml and xml on-line validators
  2. Stylesheets validation - CSS on-line validator
  3. rss and atom feed validators
  4. On-line and local validators links validation
  5. The wai Initiative for accessibility

html, xhtml and xml on-line validators

The World Wide Web Consortium (W3C) offers many useful validators, in particular for html and xhtml Web pages (English).
http://validator.w3.org/
The WDG has published various guides for the interpretation of the specifications, in particular for HTML and stylesheets (English).
http://htmlhelp.com/tools/validator/
As an example, for this page, click the W3C images to see the W3C html validator at work.
Valid HTML 4.01

To learn more about TIDY

Tidy is a validator. It integrates with various html editors.
http://www.w3.org/People/Raggett/tidy/ (English).

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Stylesheets validation - CSS on-line validator

Stylesheets (CSS) validation is also offered by the W3C. If you use it, you can validate at the W3C (multilingual):
http://jigsaw.w3.org/css-validator/validator-uri.html
As an example, for this page, click the W3C images to see the W3C CSS validator at work.
Valid CSS

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atom and rss feed validator

To validate your RSS feed, iyou may use either the Feed validator for ATOM and RSS at (English):
http://feedvalidator.org/
Or the validator offered by the W3, the World Wide Web consortium, at:
http://validator.w3.org/feed/
Should you learn how to build a rss feed, see the article "HowTo create an RSS 2.0 feed" by Pete Freitag.
http://www.petefreitag.com/item/465.cfm

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On-line and local validators links validation

To validate the hyperlinks, it is possible to install a robot locally or to use an on-line service.

The W3C service is very handy but sometimes busy. It is perfect for a one time checking (English):
http://validator.w3.org/checklink
LinkAlarm is a links validation service, adapted to a regular follow up for one or many Web sites, at a very affordable price. A free trial is offered.
http://linkalarm.com
Xenu is a free and smart local link validator.
http://home.snafu.de/tilman/xenulink.html

Remember this: a robot cannot verify that a link (a valid one) ends on the right page. The link logic must be verified manually when setting up a page.

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The WAI Initiative

The W3 website dedicated to the Web Accessibility Initiative provides guidelines and testing tools. You will find there many links to validations tools and services targeting various aspects of accessibility. So you can also control if your pages are accessible to people with disability.
http://www.w3.org/WAI/

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