Validation

Validation programs can help you wade through some rather murky waters. For example, is it better to have a web page that perfectly follows the official HTML language standard or one that perfectly supports the browsers used by your page's visitors? Unfortunately, it is almost impossible to do both.

When you consider that the visitors will be using one of about a dozen popular browser versions, things get really ugly.
These programs will help you see what problems you have, either with the standards or with a particular browser.

Then there are programs that verify that all of the links on your page still lead somewhere. If you link to other sites, those URL's may have changed or the site may have gone away entirely. You can even run into trouble with links to other pages on your own site due to mistyping or renaming.
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Cascading Style Sheet Validators

w3c
CSS
Validator
Jigsaw Powered
Enter the URL of the document (either HTML with CSS, or CSS only):


Warnings:

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HTML Validators

w3c HTML Validation Service
Enter the URL of the web page to be validated:

Show source input Show an outline of this document
Show parse tree Exclude attributes from the parse tree

Dr. Watson

Page Valet is a free tool that validates one page at a time.

Easy Submit

You provide the URL for a page, and this free service will analyze the meta tags in the context of the page content and make recommendations regarding tag length and content.

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Accessibility Validators

WAVE is a free web accessibility evaluation tool provided by WebAIM. It is used to aid humans in the web accessibility evaluation process. Rather than providing a complex technical report, WAVE shows the original web page with embedded icons and indicators that reveal the accessibility information within your page.

HiSoftware Cynthia Says logo

The HiSoftware Cynthia Says portal is a web content accessibility validation solution. It is designed to identify errors in your content related to Section 508 standards and/or the WCAG guidelines. This free tool is an online test which only validates one page at a time.

Accessibility Valet logo

Accessibility Valet is a core Site Valet tool, designed to help ensure accessibility by analysing markup for conformance to web accessibility guidelines: specifically the WCAG and Section 508. It is sold as desktop software, but this free tool is an online demonstration that validates one page at a time.