HTML Validation Service | WebReference

HTML Validation Service

W3C HTML Validation Service

Based on Gerald Oskobioni's kinder, gentler HTML validation service the W3C's HTML validator is the defacto standard against which all others are measured. This is a gateway to their easy-to-use HTML validation service (at https://validator.w3.org) based on an SGML parser. It checks HTML documents for compliance with W3C HTML Recommendations and other HTML standards.

Enter the location of a document you would like validated:

Location:
Include Weblint results run Weblint in "pedantic" mode
Show source input Show an outline of this document
Show parse tree don't show attributes in the parse tree

NOTE: To use the W3C HTML 4.0 Recommendation, start your document with one of the following doctype declarations: 

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"
            "https://www.w3.org/TR/REC-html40/strict.dtd">
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
            "https://www.w3.org/TR/REC-html40/loose.dtd">
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN"
            "https://www.w3.org/TR/REC-html40/frameset.dtd">
Comments are welcome