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HTML 4.01 / XHTML 1.0 - Enhanced validation using Relaxed expressive schemas. HTML 4.01 / XHTML 1.0 + Arbitrary vocabulary - Foregin vocabularies are allowed. HTML 4.01 / XHTML 1.0 + WCAG 1.0 - Include Web Content Accessibility Guidelines 1.0 checks. HTML 4.01 / XHTML 1.0 + SVG 1.1 - SVG is allowed and validated in HTML inline and block elements. HTML 4.01 / XHTML 1.0 + MathML 2.0 - MathML is allowed and validated in HTML inline and block elements. HTML 4.01 / XHTML 1.0 + SVG 1.1 + MathML 2.0 - SVG and MathML is allowed and validated in HTML inline and block elements.