This tool checks single HTML pages for conformance with accessibility standards to ensure the content can be accessed by everyone.
See the Handbook link to the upper right for more about the Web Accessibility Checker.
That also means that it will be accessible to more people, across more web browsers and operation systems.
Having an accessible website is also regarded as good web design practice.
Conforming to standards and regulations is one of the many ways you can make your website universally understood.
Make sure your codes and styles validate across the board.
That means they have to meet the "strict" standards set by the W3C Organization and pass a variety of validations for CSS and XHTML. Some only check CSS, others XHTML, and others for accessibility.
If you are sincere in presenting standardized pages to the public, test them with several validators.
Given a value, a constraint will tell you if that value adheres to the rules of the constraint.They will all produce the exact same result, so use whichever one suits your development style the most.In addition to AMP validity, you may also want to confirm that your AMP document is discoverable to third-party platforms.The AMP Validator comes bundled with the AMP JS library, so it is available on every AMP page out of the box.To validate: The AMP Validator can be used as a web interface at validator.