The following tables compare HTML compatibility and support for a number of layout engines. Please see the individual products' articles for further information. This article is not all-inclusive or necessarily up-to-date. Unless otherwise specified in footnotes, comparisons are based on the stable versions without any add-ons, extensions or external programs.

Only HTML 4 and XHTML 1.0 served as text/html (so called "HTML compatible" XHTML) are considered. XHTML 1.0 Strict is necessarily XHTML 1.1 with fewer elements and attributes deprecated. XHTML 2.0 is not considered as it is a redefinition of XHTML, which is not backward compatible. For more XHTML-related comparisons, please refer to comparison of layout engines (XHTML).

Version number, if possible, is provided for feature that is fully supported (based on HTML 4.01). Proprietary extensions are not included.

W3C deprecated tags and attributes and proprietary tags are comparised in comparison of layout engines (Non-standard HTML).

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