Which HTML validator is considered the most authoritative?

Which HTML validator is considered the most authoritative?

• A. W3C Markup Validation Service
• B. W3C CSS Validation Service
• C. HTML5 Validator by Google
• D. HTML Validator by Mozilla

Answer: (A)

Authority in HTML validation comes from the source of the standard. The W3C Markup Validation Service is the official validator maintained by the World Wide Web Consortium, the organization that defines HTML specifications. It validates markup against the current HTML standard (including HTML5) and serves as the reference tool for conformance, making it the most authoritative choice. Other validators, like the HTML5 Validator by Google or the Mozilla one, are useful but are independent projects and not the official standard reference. The CSS Validation Service, while helpful, checks CSS, not HTML, so it doesn’t validate HTML markup. For validating HTML against the official spec, the W3C Markup Validation Service is the best and most authoritative option.

Authority in HTML validation comes from the source of the standard. The W3C Markup Validation Service is the official validator maintained by the World Wide Web Consortium, the organization that defines HTML specifications. It validates markup against the current HTML standard (including HTML5) and serves as the reference tool for conformance, making it the most authoritative choice. Other validators, like the HTML5 Validator by Google or the Mozilla one, are useful but are independent projects and not the official standard reference. The CSS Validation Service, while helpful, checks CSS, not HTML, so it doesn’t validate HTML markup. For validating HTML against the official spec, the W3C Markup Validation Service is the best and most authoritative option.