Comparison of layout engines (XHTML)

The following tables compare XHTML compatibility and support for a number of layout engines.

Only XHTML 1.1 is considered. XHTML 1.1 is necessarily XHTML 1.0 Strict with more elements and attributes deprecated. XHTML 2.0 was a working draft with no layout engine support, but work on it was abandoned^[1] in 2009 in favor of work on HTML5 and XHTML5. XHTML 1.0 and HTML 4 (both served with text/html) are covered in comparison of layout engines (HTML). The comparison of XML capabilities are covered in comparison of layout engines (XML).

Explanation of tables

See list of layout engines for the full list.

Values

These indicate the level of support for the given item in each engine. By default, the most recent version of the engine is implied. However, a specific version number can be listed; when this indicates full support, it's the initial version of the engine fully supporting the item.

Legend
Value	Meaning
Yes	Fully supported
No	Has never been supported
Partial	Only some values are supported
Incorrect	Not implemented correctly in all cases
Experimental	May be incomplete or buggy
Nightly build	Currently in development; full support is expected
Depends	Only supported for the specified conditions
Dropped	No longer supported

Media types

The responses when a well-formatted XHTML document is served with different media types. Note that only application/xhtml+xml is the recommended media type.

Internet media type	Trident	Tasman	Gecko	WebKit	KHTML	Presto	Prince XML
`application/atom+xml`	?	?	?	?	?	8.00 beta 2^{[o 1]}^{[o 2]}	?
`application/mathml+xml`	No	No	2.0^{[g 1]}	No	No	9.50 beta 2^{[o 3]}	?
`application/rss+xml`	?	?	?	?	?	7.50 beta 1^{[o 4]}^{[o 5]}	?
`application/xhtml+xml`	XHTML 5.0	Prompt for download	XHTML	XHTML 125	HTML	XHTML 1.0	?
`application/xml`	XHTML 5.0	Crash	XHTML	XHTML 125	XML	XHTML 1.0	?
`application/xslt+xml`	?	?	?	?	?	9.00 beta 1^{[o 6]}	?
`image/svg+xml`	?	?	1.0^{[g 2]}	?	?	9.50^{[o 7]}^{[o 8]}	?
`text/xml`	XHTML 5.0	Crash	XHTML	XHTML 125	XML	XHTML 1.0	?
`text/html`	HTML	HTML	HTML	HTML	HTML	HTML	?

KHTML media type notes

application/xhtml+xml — KHTML supports this media type, but processes the document as HTML.
application/xml, text/xml — HTML entities and custom entities defined by custom DTD are not recognized.

Combined profiles

Extending XHTML by combining with other applications of XML (not referring using img/object element).

	Trident	Tasman	Gecko	WebKit	KHTML	Presto	Prince XML
MathML	No	No	1.0	No^{[w 1]}	No	2.1	6.0
SVG	5.0		1.8	522	3.2	1.0	5.1
XForms	No		No^{[g 3]}	No^{[w 2]}	No	No	?
VoiceXML	No		No	No	No	1.0	No

References

Gecko references

"the mozilla.org projects list". MathML in Mozilla. Retrieved May 1, 2005.
"the mozilla.org projects list". Mozilla SVG project. Retrieved May 1, 2005.
"the mozilla.org projects list". Mozilla XForms project. Retrieved May 1, 2005.

Opera references

^ Feature History, Opera, archived from the original on 2012-09-06, retrieved 2011-12-30
^ "Opera Features". RSS/Atom. Archived from the original on May 9, 2005.
^ Feature History, Opera, archived from the original on 2012-09-06, retrieved 2011-12-30
^ Feature History, Opera, archived from the original on 2012-09-06, retrieved 2011-12-30
^ "Opera Features". RSS. Archived from the original on August 2, 2004.
^ Feature History, Opera, archived from the original on 2012-09-06, retrieved 2011-12-30
^ Feature History, Opera, archived from the original on 2012-09-06, retrieved 2011-12-30
^ "Opera Features". SVG. Archived from the original on April 14, 2005. Retrieved May 1, 2005.

WebKit references

^ Bug 3251 - Implement MathML (master bug), WebKit
^ Bug 10048 - ER: Add support for XForms, WebKit

Other references

^ "W3C XHTML FAQ".

"W3C". XHTML media type test. Retrieved May 1, 2005.
"Developer's corner". Authoring XHTML+Voice. Retrieved May 1, 2005.

[4] Bug 124709 - MIME type application/mathml+xml should be supported, Mozilla

[9] Bug 160882 - MIME type image/svg+xml should be supported, Mozilla

[13] Bug 97806 - (xforms) Implement W3C XForms in browser and composer, Mozilla

[2] Feature History, Opera, archived from the original on 2012-09-06, retrieved 2011-12-30

[3] "Opera Features". RSS/Atom. Archived from the original on May 9, 2005.

[5] Feature History, Opera, archived from the original on 2012-09-06, retrieved 2011-12-30

[6] Feature History, Opera, archived from the original on 2012-09-06, retrieved 2011-12-30

[7] "Opera Features". RSS. Archived from the original on August 2, 2004.

[8] Feature History, Opera, archived from the original on 2012-09-06, retrieved 2011-12-30

[10] Feature History, Opera, archived from the original on 2012-09-06, retrieved 2011-12-30

[11] "Opera Features". SVG. Archived from the original on April 14, 2005. Retrieved May 1, 2005.

[12] Bug 3251 - Implement MathML (master bug), WebKit

[14] Bug 10048 - ER: Add support for XForms, WebKit

[1] "W3C XHTML FAQ".

[1]

[o 1]

[o 2]

[g 1]

[o 3]

[o 4]

[o 5]

[o 6]

[g 2]

[o 7]

[o 8]

[w 1]

[g 3]

[w 2]