Comparison of layout engines (Cascading Style Sheets)

The following tables compare CSS 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.

Explanation of the tables [edit]

Engine nomenclature [edit]

Rather than the names of web browsers, the names of the underlying engines are used. The browsers that use the various engines are listed below.

Layout engine	Release version	Preview version	Used by
Amaya	11.3.1	11.3-pre	Amaya
Blink			Chromium/Chrome (28+), Opera (14+) and Yandex
Gecko	20.0	21.0	All Mozilla software, including Firefox; SeaMonkey and Galeon; Camino; K-Meleon; Flock (up to 2.x); Debian IceWeasel; GNU IceCat (formerly GNU IceWeasel); Icedove, Iceape and Iceowl; Fennec. Also used by the Maple platform in 2010 and 2011 Samsung "SmartTV" devices which are based on the build used in Firefox 3.0.
KHTML		N/A	Konqueror^†
Presto	2.12.388		Opera; Opera Mobile, Nintendo DS & DSi Browser; Internet Channel
Tasman	(IE 5.2.3 for Mac)	none (aborted in 2003)	Internet Explorer 5+ for Mac OS X
Trident	6.0 (IE 10)	6.0 (IE 10)	Internet Explorer and other Internet Explorer shells like Maxthon (Microsoft Windows operating systems only), Windows Phone 8
WebKit	534.20	r146740	Tizen (both OS and browser), Safari (both desktop and mobile), Google Chrome, Maxthon 3, Shiira, iCab 4, OmniWeb 5.5+, Web, Adobe AIR, Midori, Adobe Dreamweaver CS4 and CS5, Android browser, Palm webOS browser, Symbian S60 browser, OWB, Steam, Rekonq, Arora, Flock (version 3+), RockMelt, Dolphin Browser, Sleipnir, Konqueror^†, rekonq. Used by the LG Smart TV platform to enable web content on TVs.

^† In Konqueror, the user can switch layout engine.

Values [edit]

Values indicate the level of support in the most recent version of the layout engine, or (if a version number is given) in the specified version. Version numbers without any other value indicate the version at which the layout engine first fully supported the feature.

Value	Meaning
Yes	Indicates that the layout engine fully supports this property/element when valid values are used.
No	Indicates that the property/element is completely ignored.
Partial	Indicates that the property/element is understood, but that not all values are supported. Supported values are implemented correctly.
Incorrect	Indicates that the property/element is understood, but that it is not implemented correctly in all cases.
Experimental	Indicates that the property/element is understood, but supported under an alternate name. May be incomplete or buggy.
Dropped	Indicates that the property/element is no longer supported.
Nightly build	Indicates that the property/element is supported to some extent in an experimental/nightly build. Future support is expected.
Depends	Indicates that the property/element is supported only on certain platforms, or if certain settings are configured.

Grammar and rules [edit]

			Trident	Gecko	WebKit	KHTML	Presto	Prince XML
CSS2	`!important`	Weight increasing	7.0	1.0	85	Yes	1.0	Yes
	`/Comment/`	Comments	3.0	1.0	85	Yes	1.0	Yes
	`@import`	Import stylesheet	8.0	1.0	Yes	Yes	1.0	2.1
	`@charset`	Character set	5.5	1.0	Yes	4.2.3	1.0	Yes
	`@media`	Media-specific rules	5.5	1.0	Yes	Yes	1.0	5.1
	`@page`	For paged media	8.0	19.0^{[g 1]}	Nightly Build^{[w 1]}	No	1.0	6.0
CSS3	`@namespace`	Namespace declaration	9.0^{[t 1]}	1.0	Yes	Yes	1.0	5.0
	`@document`	Restriction by URLs	No	6.0	No	No	No	No
	`@keyframes`	Animation key	10.0^{[t 2]}	16.0	Experimental	No	2.12	No
	`@font-face`	Define font	9.0^{[t 1]}	1.9.1	525	4.3	2.2	6.0
	`@supports`	Conditional Rules	No	17.0	Nightly build	No	2.12	No
	`@phonetic-alphabet`	Phonetic pronunciation	No	No	No	No	No	No
	`@region`	Region flow segment	No	No	Nightly build	No	No	No
	`@counter-style`	Custom Counter Styles	No	No	No	No	No	No
	`@top-left-corner`	Margin boxes ^{[spec 1]}	No	No	No ^{[w 2]}	No	No	No
	`@top-left`
	`@top-center`
	`@top-right`
	`@top-right-corner`
	`@bottom-left-corner`
	`@bottom-left`
	`@bottom-center`
	`@bottom-right`
	`@bottom-right-corner`
	`@left-top`
	`@left-middle`
	`@left-bottom`
	`@right-top`
	`@right-middle`
	`@right-bottom`
			Trident	Gecko	WebKit	KHTML	Presto	Prince XML

Trident grammar and rule notes [edit]

!important — Prior to 7.0, !important doesn't override rules defined later in the same declaration block.
@import — Prior to 8.0, media type support is broken. For @import <URL> <MEDIA>, IE requests as the URL "<URL> <MEDIA>" and will include the url() token and/or quotes in the URL, too, if present. Cannot import more than 35 stylesheets.

Presto grammar and rule notes [edit]

@import — Whilst Gecko, WebKit and iCab download all media stylesheets immediately, Opera only downloads handheld, print, projection and screen media, as well as speech if "voice" feature is enabled and TV, on TV devices. Text browser emulation mode is only a user stylesheet, so it does not switch to tty media type. This is consistent with older text browsers, which do not respect any CSS.

Selectors [edit]

			Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Element selectors^{[spec 2]}
CSS2	`*`	Universal	7.0	1.0	85	Yes	1.0	Yes
	`E`	Element	4.0	1.0	85	Yes		Yes
	`E.class`	Class	7.0	1.0	85	Yes		Yes
	`E#id`	ID	4.0	1.0	85	Yes		Yes
CSS3	`ns\|E`	Namespaced	9.0	1.0	Yes	Yes		Yes
Relationship selectors
CSS2	`E F`	Descendant	4.0	1.0	85	Yes	1.0	Yes
	`E > F`	Child	7.0	1.0	85	Yes		Yes
	`E + F`	Direct adjacent	7.0	1.0	85	Yes		Yes
CSS3	`E ~ F`	Indirect adjacent	7.0	1.7	412	3.3.2	2.0	Yes
CSS4	`E /for/ F`	Reference combinators	No	No	No	No	No	No
CSS4	`E! > F`	Subject	No	No^{[g 2]}	No	No	No	No
Attribute selectors
CSS2	`E[attr]`	Has	7.0	1.0	85	Yes	1.0	Yes
	`E[attr="value"]`	Equals	7.0	1.0	Yes	Yes		Yes
	`E[attr~="value"]`	Contains (space-separated)	7.0	1.0	Yes	Yes		Yes
	`E[attr\|="value"]`	Contains (hyphen-separated)	7.0	1.0	Yes	Yes		Yes
CSS3	`E[attr^="value"]`	Begins with	7.0	1.0	Yes	3.4	1.0	Yes
	`E[attr$="value"]`	Ends with	7.0	1.0	Yes	3.4	2.0	Yes
	`E[attr*="value"]`	Contains substring	7.0	1.0	Yes	3.4		Yes
	`E[ns\|attr]`	Namespaced	7.0	1.0	Yes	3.4		No
Pseudo-classes
CSS2	`E:link`	Unvisited hyperlink	3.0	1.0	85	Yes	1.0	6.0
	`E:visited`	Visited hyperlink	3.0	1.0	85	Yes		Yes
	`E:active`	Active	8.0	1.0	85	Yes		Yes
	`E:hover`	Mouseover	7.0	1.0	419.3	Yes		Yes
	`E:focus`	Focused	8.0	1.0	Yes	Yes		Yes
	`E:first-child`	First child	7.0	1.0	85	Yes		Yes
	`E:lang()`	Language	8.0	1.2	525	3.4		Yes
	`@page:first`	First page	8.0	No^{[g 3]}	Yes^{[w 3]}	No		Yes
	`@page:left`	Left page
	`@page:right`	Right page
CSS3	`E:root`	Root	9.0	1.0	85	3.4	2.1	Yes
	`E:not()`	Negation		1.0	85
	`E:empty`	Empty		1.8	412
	`E:first-of-type`	First child of type		1.9.1	525
	`E:last-child`	Last child		1.0
	`E:last-of-type`	Last child of type		1.9.1
	`E:only-child`	Only child		1.8
	`E:only-of-type`	Only child of type		1.9.1
	`E:nth-child`	N^th child		1.9.1
	`E:nth-last-child`	N^th last child		1.9.1
	`E:nth-of-type`	N^th child of type		1.9.1
	`E:nth-last-of-type`	N^th last child of type		1.9.1
	`E:target`	Target		1.3			2.5	No
	`E:enabled`	Enabled state		1.8			2.0
	`E:disabled`	Disabled state		1.8
	`E:checked`	Checked state		1.0
	`E:indeterminate`	Indeterminate state		1.9.2	522	No	No
	`E:default`	Default	No	1.9	Yes^{[w 4]}	4.3	2.0
	`E:valid`	Valid	10.0^{[t 3]}	1.8	Yes^{[w 5]}	No
	`E:invalid`	Invalid	10.0^{[t 4]}		Yes^{[w 5]}
	`E:in-range`	In range	No		Yes^{[w 6]}
	`E:out-of-range`	Out of range	No		Yes^{[w 6]}
	`E:required`	Required	10.0^{[t 5]}	2.0^{[g 4]}	Yes^{[w 7]}
	`E:optional`	Optional	10.0^{[t 6]}	2.0^{[g 4]}	Yes^{[w 7]}
	`E:read-only`	Read-only	No	Experimental^{[g 5]}	No	Incorrect	Incorrect
	`E:read-write`	Read and write	No	Experimental^{[g 5]}	No	Incorrect	Incorrect
CSS4	`E:not(s1, s2)`	Negations	No	No	No	No	No	No
	`E:matches(s1, s2)`	Matches-any		No ^{[g 6]}
	`E[foo="bar" i]`	Case-sensitivity		No
	`E:dir(ltr)`	Directionality		17^{[g 7]}
	`E:lang(zh, *-hant)`	Languages		No
	`E:any-link`	Hyperlink
	`E:local-link`	Local link
	`E:local-link(0)`	Local link
	`E:scope`	Contextual reference		20^{[g 8]}
	`E:current`	Time-dimensional : current		No
	`E:current(s)`	Time-dimensional : current
	`E:past`	Time-dimensional : past
	`E:future`	Time-dimensional : future
	`E:indeterminate`	Indeterminate-value
	`E:nth-match(n of selector)`	N^th child of
	`E:nth-last-match(n of selector)`	N^th last child of
	`E:column(selector)`	Column
	`E:nth-column(n)`	N^th column
	`E:nth-last-column(n)`	N^th last column
Pseudo-elements
CSS2	`E:first-letter`	First letter	9.0	1.0	85	Yes	1.0	5.0
	`E:first-line`	First line	9.0	1.0	Partial			No^{[r 1]}
	`E:before`	Before	8.0	1.9.1	Partial			Yes
	`E:after`	After	8.0	1.9.1	Partial			Yes
CSS3	`E::before`	Double colon notation	9.0	1.9.1	Partial	3.4	1.0	Yes
	`E::after`	Double colon notation		1.9.1	Partial
	`E::first-letter`	Double colon notation		1.5	85
	`E::first-line`	Double colon notation		1.5	Partial			No^{[r 1]}
	`E::marker` ^[1]	list marker	No	No	No	No	No	No
?	`E::selection`	Selection	9.0	Experimental^{[g 9]}	412	3.4	2.1	No
			Trident	Gecko	WebKit	KHTML	Presto	Prince XML

General selector notes [edit]

:read-only and :read-write — Both Presto and KHTML handle the case of the contenteditable attribute incorrectly.
::selection has been removed from the CSS3 specification, but is still supported by many browsers.

Trident selector notes [edit]

:active — Prior to 8.0, :active is only supported on anchor elements.
:hover — Prior to 7.0, :hover is only supported on anchor elements.
.one.two — Prior to 7.0, only .two class selector was taken into consideration.
* — Prior to 7.0 this was treated as a single or no element.
[attr] — Matches every td and th in a table when the attribute is colspan (regardless of whether any actually have a colspan attribute).^{[t 7]} This may not actually be a bug, as ambiguity exists in the specification.^{[t 8]}
:first-letter, :first-line — Prior to IE9 in 6.0, combining :first-letter rules with others may be problematic.^{[t 9]} In 8.0, rules with !important are ignored inside :first-line and :first-letter declarations.^{[t 10]}

Gecko selector notes [edit]

(:):before, (:):after — CSS2.0 behavior : some properties are unimplemented prior to 1.9.1.^{[g 10]}

WebKit selector notes [edit]

:lang() — Only detected when explicitly present on element being tested, attribute not inherited.
(:):first-line — text-transform doesn't apply with this pseudo-element.^{[w 8]}
(:):before/after — some styles can't be applied to :before and :after pseudo-elements, such as animations and transitions.^{[w 9]}

Presto selector notes [edit]

:target — Prior to 2.5, styles aren't applied when navigating using back and forward buttons.

Properties [edit]

		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Box Model^{[spec 3]}
CSS2	`margin`	9.0	1.0	85	Yes	1.0	Yes
	`padding`	4.0	1.0	85	Yes		Yes
	`width`	4.0	1.0	85	Yes		Yes
	`height`	4.0	1.0	85	Yes		Yes
	`float`	5.0	1.0	85	Yes		Yes
	`clear`	5.0	1.0	85	Yes		Yes
	`display`	8.0	1.9	85	Yes		Yes
	`min-width`	7.0	1.0	Partial	Yes		5.0
	`max-width`	7.0	1.0	Partial	Yes		5.0
	`min-height`	7.0	1.7	Partial	3.3.2		5.0
	`max-height`	7.0	1.7	Partial	3.3.2		5.0
	`visibility`	9.0	1.8	Partial	Partial	2.5	Partial
Overflow ^{[spec 4]}
CSS2	`overflow`	9.0	1.0	85	3.2	1.0	5.0
CSS3	`overflow-x`	9.0	1.8	525	3.5.6	2.1	5.0
	`overflow-y`	9.0	1.8	525	3.5.6	2.1	5.0
	`max-lines`	No	No	No	No	No	No
Borders^{[spec 5]}
CSS2	`border`	4.0	1.0	85	Yes	1.0	3.0
	`border-color`	7.0
	`border-style`	8.0
	`border-width`	4.0
	`border-top`	5.5
	`border-right`
	`border-bottom`
	`border-left`
CSS3	`border-radius`	9.0^{[t 1]}	2.0^{[g 11]}	533^{[w 10]}	Experimental	2.5	6.0
	`border-image`	No	15.0^{[g 12]}	Experimental	No	2.5	No
	`border-image-source`		15.0^{[g 13]}	No		No
	`border-image-slice`
	`border-image-width`
	`border-image-outset`
	`border-image-repeat`
	`box-shadow`	9.0^{[t 11]}	2.0^{[g 14]} ^{[g 15]}	Yes^{[w 11]}	No	2.5	No
	`box-decoration-break`	No	No^{[g 16]}	No^{[w 12]}	No	2.7^{[p 1]}	No
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Line Layout^{[spec 6]}
CSS2	`line-height`	4.0	1.0	85	Yes	1.0	5.0
CSS2	`vertical-align`	8.0	1.0	85	Yes	1.0	6.0
Positioning
CSS2	`position`	7.0	1.0	85	Yes	1.0	5.0
	`top`	8.0	1.0	85	Yes		6.0
	`right`	8.0	1.0	85	Yes		6.0
	`bottom`	8.0	1.0	85	Yes		6.0
	`left`	8.0	1.0	85	Yes		6.0
	`z-index`	8.0	1.9	85	Yes		6.0
Box Alignment Module^{[spec 7]}
CSS3
	`align-content`	No	No	Experimental	No	No	No
	`align-items`		16.0
	`align-self`
	`justify-content`
	`justify-items`		No	No
	`justify-self`		No	No
Generated and Replaced Content^{[spec 8]}
CSS2	`quotes`	8.0	Yes	Nightly build^{[w 13]}	3.4	1.0	No
	`content`	9.0^{[t 12]}	1.9	Partial	Yes	2.7	Partial
	`counter-increment`	8.0	1.8	525	3.4	1.0	5.0
	`counter-reset`	8.0	1.8	525	3.4	1.0	5.0
Lists^{[spec 9]}
CSS2	`list-style`	4.0	1.0	85	Yes	1.0	6.0
	`list-style-image`	4.0	1.0	85	Yes		6.0
	`list-style-position`	4.0	1.0	85	Yes		6.0
	`list-style-type`	8.0	1.0	85	3.4		Partial
Colors^{[spec 10]}
CSS2	`color`	3.0	1.0	85	Yes	1.0	5.0
CSS3	`opacity`	9.0^{[t 1]}	1.7	125	4.0	2.0	6.0
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Backgrounds^{[spec 5]}
CSS2	`background`	4.0	1.0	85	Yes	1.0	6.0
	`background-attachment`	7.0					5.0
	`background-color`	4.0					3.1
	`background-image`	8.0					6.0
	`background-position`	8.0					3.1
	`background-repeat`	4.0					3.1
CSS3	`background (multiple)`	9.0^{[t 1]}	1.9.2	312	3.5	2.5	No
	`background-clip`		2.0^{[g 17]}	Yes^{[w 14]}	Experimental
	`background-origin`			Yes^{[w 14]}
	`background-size`			Yes^{[w 15]}
Fonts^{[spec 11]}
CSS2	`font`	4.0	1.0	85	Yes	Incorrect	Yes
	`font-family`	4.0	1.0	85	Yes	1.0	Yes
	`font-size`	3.0	1.0	85	Yes		3.1
	`font-style`	4.0	1.0	85	Yes		Yes
	`font-variant`	4.0	1.0	125	Yes		Yes
	`font-weight`	8.0	Partial	Partial	Yes	Incorrect	Yes
CSS3	`font-size-adjust`	10.0^{[t 13]}	1.9	No^{[w 16]}	No	No	No
	`font-stretch`	9.0^{[t 1]}	9.0^{[g 18]}	No^{[w 17]}	No	No	6.0
	`font-feature-settings`	10.0^{[t 14]}	Experimental	No^{[w 18]}	No	No	No
	`font-kerning`	No	No	No	No	No	No
	`font-language-override`	No	No	No	No	No	No
	`font-synthesis`	No	No	No	No	No	No
	`font-variant-alternates`	No	No	No	No	No	No
	`font-variant-caps`
	`font-variant-east-asian`
	`font-variant-ligatures`
	`font-variant-numeric`
	`font-variant-position`
	`unicode-range`	9.0^{[t 15]}	No^{[g 19]}	No	No	No	No
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Text^{[spec 12]}
CSS2	`text-align`	4.0	1.0	85	Yes	1.0	Yes
	`text-decoration`	Yes	1.0	85	Yes		3.1
	`text-indent`	3.0	1.0	85	Yes		Yes
	`text-transform`	4.0	1.0	85	Yes		6.0
	`letter-spacing`	4.0	1.0	85	Yes		5.0
	`word-spacing`	8.0	1.0	85	Yes		5.0
	`white-space`	8.0	1.9.1	522	Yes	2.1	6.0
CSS3	`text-overflow`	Partial	7.0^{[g 20]}	Partial	3.5.6	Experimental (Nightly)^{[p 2]}	No
	`word-break`	Partial	15.0^{[g 21]}	No	No	No	No
	`line-break`	No	No	No	No	No	No
	`hyphens`	10.0^{[t 16]}	6.0^{[g 22]}	Nightly build	No	No	No
	`word-wrap`	5.0	1.9.1	85	4.3	2.5	No
	`overflow-wrap`	No	No^{[g 23]}	No	No	No	No
	`text-align-last`	Partial	12.0^{[g 24]}	No^{[w 19]}	No	No	Partial
	`text-justify`	5.5	No^{[g 25]}	No	No	No	6.0
	`text-emphasis`	No	No	No	No	No	No
	`hanging-punctuation`	No	No	No^{[w 20]}	No	No	No
CSS4	`hyphenate-character`	No	No	No	No	No	No
	`hyphenate-limit-zone`	10.0^{[t 17]}
	`hyphenate-limit-chars`	10.0^{[t 18]}
	`hyphenate-limit-lines`	10.0^{[t 19]}
	`hyphenate-limit-last`	No
Text Decoration^{[spec 13]}
CSS3	`text-shadow`	10.0^{[t 20]}	1.9.1	Yes	3.4	2.1	No
	`text-decoration-style`	No	6.0^{[g 26]}^{[g 27]}	No^{[w 21]}	No	No	No
	`text-decoration-color`	No			No	No	No
	`text-decoration-line`	No			No	No	No
	`text-decoration-skip`	No	No		No	No	No
	`text-underline-position`	No	No	No	No	No	No
	`text-emphasis-style`	No	No	No	No	No	No
	`text-emphasis-color`
	`text-emphasis`
	`text-emphasis-position`
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Writing Modes^{[spec 14]}
CSS2	`direction`	5.0	1.0	85	Yes	1.0	7.0
CSS2	`unicode-bidi`	5.0	1.0	525	Yes	1.0	7.0
CSS3	`writing-mode`	6.0^{[t 21]}	No^{[g 28]}	Nightly Build^{[w 22]}	No	No	No
CSS3	`text-combine`	No	No	Nightly build^{[w 23]}	No	No	No
Tables
CSS2	`border-collapse`	8.0	1.0	125	Yes	1.0	5.1
	`border-spacing`	8.0	1.0	125	Yes		6.0
	`caption-side`	8.0	1.4	85	Yes		5.0
	`empty-cells`	8.0	1.0	125	Yes		5.0
	`table-layout`	5.0	1.0	85	Yes		6.0
User interface^{[spec 15]}
CSS2	`cursor`	5.5	1.8	125	Yes	Partial	Yes
	`outline`	8.0	1.8	125	Yes	1.0	No
	`outline-color`	8.0	1.8	125	Yes		No
	`outline-style`	8.0	1.8	125	Yes		No
	`outline-width`	8.0	1.8	125	Yes		No
CSS3	`outline-offset`	No	1.8	125	3.5	2.1	No
	`box-sizing`	8.0	Experimental^{[g 29]}	Yes^{[w 24]}	3.3.2	1.0	7.0
	`resize`	No	2.0^{[g 30]}	525	No	No	No
	`appearance`	No	Experimental	Experimental	No	No	No
	`icon`	No	No	No	No	No	No
	`nav-index`	No	No	No	No	2.1	No
	`nav-up`	No	No	No	No		No
	`nav-right`	No	No	No	No		No
	`nav-down`	No	No	No	No		No
	`nav-left`	No	No	No	No		No
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Paged media^{[spec 16]}
CSS2	`page-break-before`	4.0	Partial	Partial	3.5	1.0	6.0
	`page-break-after`	4.0	Partial	Partial			6.0
	`page-break-inside`	8.0	19.0^{[g 31]}	312			6.0
	`orphans`		No^{[g 32]}				6.0
	`widows`		No^{[g 32]}				6.0
CSS3	`page`	No	No	No	No	No	Yes
	`size`	No	No	No^{[w 25]}	No	1.0	6.0
	`image-orientation`	No	No	No	No	No	No
	`object-fit`	No	No^{[g 33]}	No	No	2.7^{[p 3]}	No
	`object-position`	No	No	No	No	2.7^{[p 3]}	No
Speech^{[spec 17]}
CSS3	`cue`	No	No^{[g 34]}	No	No	1.0	No
	`cue-after`
	`cue-before`
	`pause`
	`pause-after`
	`pause-before`
	`speak`			Nightly build^{[w 26]}
	`voice-family`			No
	`voice-balance`					Experimental
	`voice-duration`
	`voice-pitch`
	`voice-pitch-range`
	`voice-rate`
	`voice-stress`
	`voice-volume`
	`interpret-as`
	`phonemes`
	`rest`					No
	`rest-after`
	`rest-before`
	`mark`
	`mark-after`
	`mark-before`
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Media Queries^{[spec 18]}
CSS3	`width`	9.0^{[t 22]}	1.9.1	525	4.1	2.0	No
	`height`
	`device-width`
	`device-height`
	`device-aspect-ratio`
	`color`					2.5
	`color-index`
	`monochrome`
	`resolution`			No
	`orientation`				4.2.1	No
	`aspect-ratio`				4.2.1	2.1
	`grid`	No	No		4.1	2.5
	`scan`	No	No		4.1	2.5
Ruby characters^{[spec 19]}
CSS3	`ruby-position`	5.0	No^{[g 35]}	No	No	No	No
	`ruby-align`
	`ruby-overhang`
	`ruby-span`	No
Multi-column Layout^{[spec 20]}
CSS3	`column-count`	10.0^{[t 23]}	Experimental^{[g 36]}	Experimental	No	2.8^{[p 4]}	Yes
	`column-width`
	`column-gap`
	`column-rule`
	`columns`		9.0^{[g 37]}
	`break-before`		No^{[g 38]}	Experimental^{[w 27]}			6.0
	`break-after`			Experimental^{[w 27]}
	`break-inside`			No^{[w 28]}
	`column-fill`		14.0^{[g 39]}	No
	`column-span`		No^{[g 40]}	Experimental^{[w 29]}			No
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Grid layout^{[spec 21]}
CSS3	`grid-after`	No	No^{[g 41]}	No^{[w 30]}	No	No	No
	`grid-area`
	`grid-auto-columns`
	`grid-auto-flow`
	`grid-auto-rows`
	`grid-before`
	`grid-column`
	`grid-definition-columns`
	`grid-definition-rows`
	`grid-end`
	`grid-row`
	`grid-start`
	`grid-template`
Animation^{[spec 22]}
CSS3
	`animation`	10.0^{[t 24]}	16.0^{[g 42]}	Experimental	No	2.12	No
	`animation-delay`
	`animation-direction`
	`animation-duration`
	`animation-iteration-count`
	`animation-name`
	`animation-play-state`
	`animation-timing-function`
	`animation-fill-mode`
Transforms^{[spec 23]}
CSS3
	`transform`	10.0^{[t 25]}	16.0	Experimental	No	2.12	No
	`transform-origin`					2.12
	`transform-style`					No
	`perspective`
	`perspective-origin`
	`backface-visibility`
Transitions^{[spec 24]}
CSS3
	`transition-property`	10.0^{[t 26]}	16.0^{[g 43]}	Experimental	No	Experimental	No
	`transition-duration`
	`transition-timing-function`
	`transition-delay`
	`transition`
Flexible Box Layout^{[spec 25]}
CSS3
	`flex`	10.0^{[t 27]}	Experimental^{[g 44]}	Experimental	No	2.12	No
	`flex-basis`	No				No
	`flex-direction`	10.0^{[t 28]}				2.12
	`flex-flow`	10.0^{[t 28]}				No
	`flex-grow`	No				2.12
	`flex-shrink`	No				No
	`flex-wrap`	10.0^{[t 29]}				No
	`order`	No				2.12
Marquee^{[spec 26]}
CSS3
	`marquee-direction`	No	No	Experimental^{[w 31]}	No	No	No
	`marquee-play-count`
	`marquee-speed`
	`marquee-style`
	`overflow-style`			No
Regions^{[spec 27]}
CSS3
	`flow-into`	10.0^{[t 30]}	No^{[g 45]}	Nightly build	No	No	No
	`flow-from`	10.0^{[t 30]}
	`region-overflow`	No
	`break-before`	10.0^{[t 31]}
	`break-after`
	`break-inside`
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Exclusions and Shapes^{[spec 28]}
CSS3
	`wrap`	No	No^{[g 46]}	Nightly build	No	No	No
	`wrap-flow`	10.0^{[t 32]}
	`wrap-margin`	10.0^{[t 32]}
	`wrap-padding`	No
	`wrap-through`	10.0^{[t 33]}
	`shape-outside`	No
	`shape-inside`
	`shape-image-threshold`
Masking^{[spec 29]}
CSS2	`clip`	8.0	1.0	85	Yes	1.0	5.0
CSS3
	`clip-path`	No	1.9.1	No	No	No	No
	`clip-rule`	No	No	No	No	No	No
	`mask`	No	Partial	Partial	Partial	Partial	Partial
	`mask-box-image`	No	No	Experimental	No	No	No
	`mask-box-image-outset`			No
	`mask-box-image-repeat`
	`mask-box-image-slice`
	`mask-box-image-source`
	`mask-box-image-width`
	`mask-clip`	No	No	Experimental	No	No	No
	`mask-image`
	`mask-origin`
	`mask-position`
	`mask-repeat`
	`mask-size`
	`mask-type`		20.0	No
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML

Trident property notes [edit]

margin — inherit inherits the computation and recomputes it instead of inheriting the computed value.^{[t 34]}
display — Prior to 7.0, only none, block, inline, table-header-group, and table-footer-group are fully supported. Prior to 8.0, table are not supported, while inline-block is only supported on elements that are naturally inline.
overflow — Prior to 7.0, overflow: visible; is incorrectly supported. In 8.0, scroll makes the element's height equal to its max-height even if the content isn't that tall.^{[t 35]} This has been fixed in IE9.
visibility — Prior to 8.0, visibility: collapse; is not supported. In 8.0, inline elements with visibility: visible; inside block elements with visibility: hidden; are not visible.^{[t 36]}
content — In 8.0, computed attr() values are not updated when the attribute changes.^{[t 37]}
border-color — Prior to 7.0, transparent is not supported.
border-style — Prior to 8.0, hidden is not supported.
border-style — Prior to 7.0, dotted is rendered as dashed.
box-shadow — Trident 9.0 renders box-shadow blur value at about half the declared value. Prior to 9.0, trident supports similar functionality since 5.5 using the proprietary Shadow^{[t 38]} and DropShadow^{[t 39]} filters.
position — Prior to 7.0, fixed positioning was not supported. 7.0 and later support it in standards-compliant mode only.
z-index — Prior to 8.0, z-index is only partially supported.^{[t 40]} In 8.0, floating point values are accepted in addition to integers.^{[t 41]}
list-style-type — Prior to 8.0, armenian, decimal-leading-zero, georgian, lower-greek, lower-latin, upper-latin are not supported.
opacity — Prior to 9.0, Trident supported a proprietary alternative.^{[t 42]}
background-image — Prior to 8.0, background images are badly positioned in some cases.^{[t 43]}^{[t 44]}
background-attachment — Prior to 7.0, fixed was allowed on the body element only.
background-position — Prior to 8.0, fixed positioning is not supported.
font-weight — Prior to 8.0, incorrect rendering when value is 600.^{[t 45]}
text-align — In 8.0, text-align isn't inherited by :before and :after pseudo-elements.^{[t 46]}
white-space — Prior to 6.0, pre is not supported. Prior to 8.0, white-space is only partially supported; pre-line and pre-wrap are not supported.^{[t 47]}
cursor — Does not fail on non-prefixed vendor extensions.

Gecko property notes [edit]

display — Values except inline-block and inline-table supported prior to 1.9.
z-index — Negatives values are badly supported prior to 1.9.
content — none value is unsupported prior to 1.9. This property also fails on any normal (non-pseudo-) elements, which it must support according to the CSS3 "Generated and Replaced Content Module" spec.
background-position — Versions prior to 1.7 implement the CSS2 syntax, not the proposed CSS2.1 expanded syntax.
font-size-adjust — Prior to 1.9, supported on Windows only.
font-weight — Only Regular and Bold weights get used, even if Light or Heavy/Black faces are installed, unless using DirectWrite in Gecko 2.0 on Windows 7 or Windows Vista.
white-space — pre-line is not supported prior to 1.9.1. Prior to 1.9, pre-wrap was only supported experimentally as -moz-pre-wrap.
visibility — collapse is unsupported prior to 1.8.
border-radius — Prior to 1.9.1, border curves are circular, not elliptical as specified by the current CSS3 draft. Short-cut definitions for border-radius read "tl tr br bl" instead of the W3C's "tr br bl tl". When the border style is dotted or dashed, curves are rendered as solid instead.^{[g 47]}
page-break-before; page-break-after — Only the always and auto values are supported.

WebKit property notes [edit]

max-width; max-height; min-width; min-height — Are not supported on tables.^{[w 32]}
font — The system font keywords that allow designers to tailor presentation to the user's operating system environment are unsupported.
font-weight — Only Regular and Bold weights get used, even if Light or Heavy/Black faces are installed.
page-break-before; page-break-after — Only the always and auto values are supported.
white-space — Prior to 522, pre-line and pre-wrap are unsupported.
visibility — collapse is unsupported prior to 522. Its implementation has the same effect as hidden and is therefore not compliant.^{[w 33]}
content — The none, open-quote, close-quote, no-open-quote, no-close-quote and normal values are unsupported. This property also fails on any normal (non-pseudo-) elements, which it must support according to the CSS3 "Generated and Replaced Content Module" spec.
font-size — The font-size property does not always accept the value 0, in "font-size: 0px" the text is still visible.

KHTML property notes [edit]

overflow — Values scroll and auto are unsupported.
page-break-before; page-break-after — Before 3.5 only the always and auto values were supported.
visibility — All properties are supported, but the implementation of collapse has the same effect as hidden and is therefore not compliant.

Presto property notes [edit]

counter-increment, counter-reset — Implemented the algorithm in REC CSS2.
background-position — Presto versions prior to Opera 8.0 implement the CSS2 syntax, not the proposed CSS2.1 expanded syntax.
font-weight — Incorrect rendering when value is 600. Renders the text in a compatibility mode for websites made for Trident.
visibility — Prior to 2.5, the value collapse was unsupported in table columns. On rows, it had the same effect as hidden and was therefore not compliant.
cursor — cursor is ignored with dynamic pseudo-classes and custom cursors are unsupported.
content — Prior to 2.7, the none value was unsupported.^{[p 5]}
font — inherit should not be allowed together with a font-size value. This should not be parsed, but it's currently done in Opera.

Prince XML property notes [edit]

visibility — The value collapse is unsupported.^{[r 1]}
list-style — The values armenian and georgian are unsupported.^{[r 1]}
content — The values open-quote and close-quote are unsupported.^{[r 1]}

Descriptors [edit]

		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
@counter-style
CSS3	`additive-symbols`	No	No	No	No	No	No
	`fallback`
	`negative`
	`prefix`
	`range`
	`speak-as`
	`suffix`
	`symbols`
	`system`
	`width`
@font-face
CSS3	`font-family`	Yes	Yes	Yes	Yes	Yes	Yes
	`font-feature-settings`			Yes	Yes	Yes
	`font-stretch`			No	No	No
	`font-style`			Yes	Yes	Yes
	`font-variant`			Yes		Yes
	`font-weight`		Partial	Partial		Incorrect
	`src`		Yes	Yes		Yes
	`unicode-range`		No	No	No	No	No

Values and units [edit]

			Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Numbers^{[spec 30]}
CSS2	`<number>`	A floating-point number	3.0	1.0	85	Yes	1.0	6.0
	`<length>`	<number> followed by units
	`<percentage>`	<number> followed by %
	`<integer>`	An integer
CSS3	`<angle>`	<number> angle-unit	9.0^{[t 1]}	Yes	Partial	Partial	Partial	No
	`<time>`	<number> time-unit	9.0^{[t 1]}	2.0^{[g 43]}	Yes	Yes	2.5
	`<frequency>`	<number> frequency-unit	No	No	Yes	Yes	No
	`<fraction>`	Remaining space	No	No	No	No	No
Strings
CSS2	`<string>`	String	3.0	1.0	85	Yes	1.0	Yes
CSS2	`\code`	Unicode escapes	6.0	1.0	85	Yes	1.0	Yes
Functions
CSS2	`rect()`	A rectangle	8.0	1.0	85	Yes	1.0	Yes
	`url()`	Uniform Resource Identifier	3.0	1.0	85	Yes	1.0	Yes
	`counter()`		8.0
	`attr()`	Attribute identifier	8.0
CSS3	`calc()`		9.0^{[t 1]}	16.0^{[g 48]}	Yes^{[w 34]}	No	No	No
CSS3	`toggle()`	Toggling between values	No	No	No	No	No	No
Colors
CSS2	HTML4 color keywords	16 predefined web colors	3.0	1.0	85	Yes	1.0	Yes
	`#rrggbb or #rgb`	Hexadecimal notation	3.0
	`rgb(r, g, b)`	RGB notation	4.0
	`system colors`^{[spec 31]}	28 predefined system colors	3.0
CSS3	SVG color keywords		8.0	Yes	Yes	Yes	Yes	?
	`currentColor`	The value of the `color` property.	9.0^{[t 1]}	1.8	528	Yes	2.1	?
	`rgba(r, g, b, a)`	RGBA notation		1.9	525	4.0	2.2	6.0
	`hsl(h, s, l)`	HSL notation		1.5		3.5.5	2.1	No
	`hsla(h, s, l, a)`	HSLA notation		1.9		3.5.5	2.2	No
	`transparent`	Full transparency	9.0	1.9		4.0	Partial	Partial
Image values^{[spec 32]} ^{[spec 33]}
CSS2	`<url>`	Image types	3.0	1.0	85	Yes	1.0	Yes
CSS3	`<sprite>`		No	No	No	No	No	No
	`<image-list>`		No	No	No		No
	`<linear-gradient>`		10.0^{[t 48]}	16.0	Experimental^{[w 35]}		Experimental
	`<radial-gradient>`
	`linear-gradient()`	Color gradients
	`radial-gradient()`
	`repeating-linear-gradient()`
	`repeating-radial-gradient()`
CSS4	`conic-gradient()`		No	No	No	No	No	No
	`repeating-conic-gradient()`		No	No	No	No	No	No
	`element()`	Reproduce element	No	Experimental	No	No	No	No
	`cross-fade()`	Transitioning between images	No	No ^{[g 49]}	No	No	No	No
	`image-set()`	Resolution negotiation	No	No	No	No	No	No
Counter Styles ^{[spec 34]}
CSS3	`symbols()`	Anonymous Counter Styles	No	No	No	No	No	No
Keywords
CSS2	`auto`	Automatically calculated	6.0	1.0	85	Yes	1.0	Yes
CSS2	`inherit`	Inherited from the parent	8.0	1.0	85	Yes	1.0	Yes
CSS3	`initial`		No	19.0	125	No	No	No
Units
CSS2	`px`	Pixel	3.0	1.0	85	Yes	1.0	Yes
	`pt`	Point
	`pc`	Pica
	`cm`	Centimetre
	`mm`	Millimetre
	`in`	inch
	`em`	em
	`ex`	ex
	`%`	Percentage
CSS3	`deg`	Degree	9.0^{[t 1]}	1.9.1	Yes	Yes	2.5	No
	`grad`	Grad
	`rad`	Radian
	`turn`	turn		13.0 ^{[g 50]}	No	No	No
	`ms`	Millisecond		2.0^{[g 51]}	Yes	Yes	2.5
	`s`	Second		2.0^{[g 51]}			2.5
	`Hz`	Hertz	No	No			No
	`kHz`	Kilohertz		No			No
	`dpi`	Dots per inch		1.9.1	No	4.1	2.5
	`dpcm`	Dots per centimetre		1.9.1	No	4.1	2.5
	`dppx`	Dots per pixel-unit		16.0	No	?	No
	`gd`	Cells in the layout-grid		No	No	No	No
	`fr`	Remaining space in a series of length values		No	No	No	No
	`rem`	the font size of the root element	9.0^{[t 1]}	1.9.2	Nightly build^{[w 36]}	No	2.10.229^{[p 6]}
	`vw`	the viewport's width		19.0^{[g 1]}	Nightly build^{[w 37]}	No	No
	`vh`	the viewport's height			Nightly build^{[w 37]}
	`vmin`	equal to the smaller of ‘vw’ or ‘vh’.	No		Nightly build^{[w 38]}
	`vmax`	equal to the larger of ‘vw’ or ‘vh’.	No		Nightly build^{[w 38]}
	`ch`	the width of the "0" (ZERO, U+0030) glyph found in the font for the font size used to render.	No	1.9.1	No	No	No
Variables
CSS ML1 ^{[spec 35]}
	`var-*`	define variable	No	No^{[g 52]}	Experimental	No	No	No
	`var()`	use variable	No	No^{[g 52]}	Experimental	No	No	No
			Trident	Gecko	WebKit	KHTML	Presto	Prince XML

General value and unit notes [edit]

transparent —

CSS1 introduced the ‘transparent’ value for the background-color property. CSS2 allowed border-color to also accept the ‘transparent’ value. The Open eBook(tm) Publication Structure 1.0.1 [OEB101] extended the ‘color’ property to also accept the ‘transparent’ keyword. CSS3 extends the color value to include the ‘transparent’ keyword to allow its use with all properties that accept a <color> value. This simplifies the definition of those properties in CSS3.
<angle> — The turn unit is unsupported.

Trident value and unit notes [edit]

rect() — Prior to 8.0, rect() was not supported with the correct syntax using commas.
auto — In quirks mode (IE5 emulation mode), auto does not work for margins, except table elements.
transparent — In 7.0 and 8.0, using transparent in the color property will render the text as black.
transparent — Prior to 7.0, transparent is not supported on borders (shows as solid black) and is ignored on PNG images.

Gecko value and unit notes [edit]

<ch> — Prior to version 1.9.1, used the width of the "M" glyph instead of the width of the "0" glyph.^{[g 53]}

Presto value and unit notes [edit]

<number> — Prior to 2.1, there existed a quantization error for values greater than 20.47 (not limited to em, try any non-pixel units).^{[p 7]}
transparent — Keyword is ignored when used with the outline-color property. Prior to version 2.2, it was also ignored when used with the color and text-shadow properties.

General notes [edit]

Trident general notes [edit]

-ms- — All experimental properties are prefixed with "-ms-", e.g. -ms-interpolation-mode instead of interpolation-mode.

Gecko general notes [edit]

-moz- — All experimental selectors, properties and values are prefixed with "-moz-", e.g. ::-moz-selection instead of ::selection.

WebKit general notes [edit]

-webkit- — All experimental selectors, properties and values are prefixed with "-webkit-", e.g. -webkit-box-shadow instead of box-shadow.

KHTML general notes [edit]

-khtml- — All experimental selectors, properties and values are prefixed with "-khtml-", e.g. -khtml-opacity instead of opacity.

Presto general notes [edit]

-xv- — All new selectors, properties and values introduced by CSS3 Speech Module are prefixed with "-xv-" (but not found in CSS2 aural style sheets), e.g. -xv-voice-rate instead of voice-rate.
-o- — All experimental properties are prefixed with "-o-", e.g. -o-transition-property instead of transition-property.

DOM equivalents to vendor-specific styles [edit]

The DOM properties corresponding to vendor-specific experimental CSS properties are prefixed with the vendor-prefix, without any hyphens, and with first letters capitalised, e.g. element.style.MozBorderRadius corresponding to the -moz-border-radius property, or element.style.OTransform corresponding to the -o-transform property. The exception is Internet Explorer which uses a lower-case prefix, e.g. element.style.msTransform.

References [edit]

"W3C". CSS 1 test suite. Retrieved May 1, 2005.
"W3C". CSS 2.1 test suite. Retrieved May 1, 2005.
"mozilla.org Bugzilla". Bug 281960 - [devmo] Mozilla CSS support chart. Retrieved July 13, 2005.
"Mozilla Developer Center". Mozilla CSS support chart. Retrieved May 21, 2006.
"Opera Documentation". Web Specifications Supported in Opera - CSS. Retrieved May 1, 2005.
"Internet & Web - Safari". CSS Support in Safari. Retrieved July 13, 2005.
"Konqueror Homepage". CSS 2.1 & 3 Support in KHTML 3.4. Retrieved July 13, 2005.
"Apple Developer Connection". Safari CSS Reference. Retrieved July 14, 2005.
"Prince XML". Release Changelog.
"Prince XML". Unsupported CSS2.1 features.
"Microsoft MSDN". CSS Compatibility and Internet Explorer. Retrieved Sep 29 2009.

External links [edit]

WebDevout — mostly covers Windows browsers. Extensive bug testing.
Can I use — comparison tables for HTML5 and CSS3
QuirksMode — comprehensive and current as of April 2012.

[5] CSS Paged Media Module Level 3 - Margin Boxes, W3C

[7] Selectors Level 3, W3C

[34] CSS basic box model, W3C

[35] CSS Overflow Module Level 3, W3C

[spec-back-borders-36] CSS Backgrounds and Borders Module Level 3, W3C

[48] CSS3 module: line, W3C

[49] CSS Box Alignment Module Level 3, W3C

[50] CSS3 Generated and Replaced Content Module, W3C

[53] CSS3 module: Lists, W3C

[54] CSS Color Module Level 3, W3C

[58] CSS Fonts Module Level 3, W3C

[67] CSS Text Level 3, W3C

[81] CSS Text Decoration Module Level 3, W3C

[86] CSS Writing Modes Module Level 3, W3C

[91] CSS3 Basic User Interface Module, W3C

[95] CSS3 Module: Paged Media, W3C

[101] CSS3 Speech Module, W3C

[104] Media Queries, W3C

[106] CSS3 Ruby Module, W3C

[108] CSS Multi-column Layout Module, W3C

[119] Grid Layout, W3C

[122] CSS Animations Module Level 3, W3C

[125] CSS Transforms Module Level 3, W3C

[127] CSS Transitions Module Level 3, W3C

[130] Flexible Box Layout, W3C

[135] CSS Marquee Module Level 3, W3C

[137] CSS Regions Module, W3C

[141] CSS exclusions and shapes, W3C

[145] CSS Masking, W3C

[164] CSS3 Values and Units, W3C

[167] System Colors, W3C

[168] CSS Image Values Module Level 3, W3C

[169] CSS Image Values Module Level 4, W3C

[173] CSS Counter Styles Level 3, W3C

[180] CSS Custom Properties for Cascading Variables Module Level 1, W3C

[ie9-preview-3] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Internet Explorer Platform Preview Guide for Developers, Microsoft

[4] @keyframes rule (Internet Explorer), Microsoft

[12] ":valid pseudo-class (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[14] ":invalid pseudo-class (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[16] ":required pseudo-class (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[19] ":optional pseudo-class (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[27] Hopkins, James, Attribute selector (which matches the attribute, 'colspan' for TD and TH elements) matches every TD and TH element

[28] Hammond, David, Comment on "IE 8 CSS 2.1 support results"

[29] :first-letter Ignore Bug, hasLayout.net

[30] Hopkins, James, Declaration which includes !important keyword is ignored when used within a :first-letter or :first-line rule

[41] Box-shadow, one of CSS3′s best new features - Browser's support (including IE9), WEBFLUX

[52] content property doesn't return the value of an attribute when attribute is dynamically

[59] "font-size-adjust property (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[63] "font-feature-settings property (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[65] "@font-face rule (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[71] "-ms-hyphens property (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[78] "-ms-hyphenate-limit-zone property (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[79] "-ms-hyphenate-limit-chars property (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[80] "-ms-hyphenate-limit-lines property (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[82] "text-shadow property (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[87] CSS 3 Text: A Tale of writing-mode Woe

[105] "@media rule (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[109] "Multi-column Layout (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[123] "Animations (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[126] "Transforms (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[128] "Transitions (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[131] "Flexible Box ("Flexbox") Layout (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[133] "Flexible Box ("Flexbox") Layout (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[134] "Flexible Box ("Flexbox") Layout (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[138] "Regions (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[140] "Multi-column Layout (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[143] "Exclusions (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[144] "Exclusions (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[146] Talbot, Inherited margin with inherit keyword: the computed value's parent should be inherited

[147] Groot, Sven, Overflow: scroll causes element to always have its max-height

[148] Hopkins, James, visibility:visible applied to inline element doesn’t override inherited visibility:hidden value applied to it’s block-level parent

[149] Content: attr(x) isn't updated when the attribute's value change

[150] Shadow Filter, Microsoft

[151] DropShadow Filter, Microsoft

[152] Positioning

[153] Hopkins, James, Illegal parsing of a z-index decimal value, instead of an integer

[154] Alpha Filter, Microsoft

[155] IE7-/Escaping Background Image Bug - Demo 1

[156] IE7-/Escaping Background Image Bug - Demo 2

[157] Koch, Peter-Paul, IE Windows and Opera - font-weight: 600 vs. bold, QuirksMode

[158] Hopkins, James, 'text-align' value isn't inherited by ':before' and ':after' pseudo elements

[159] Font and Text, Microsoft

[170] "Gradients (Internet Explorer)". Microsoft. Retrieved 17 November 2012.

[moz-page-1] "What’s New", Firefox 19 Release Notes (Mozilla)

[8] Bug 418039 - CSS parent (has-child) and ancestor (has-descendant) selectors (:subject), Mozilla

[9] Bug 813187 - Support CSS 2.1 @page Page Selectors, Mozilla

[17] Bug 506554 - Implement the CSS3 pseudo-classes :required and :optional, Mozilla

[20] Bug 312971 - Support :read-only and :read-write pseudoclasses, Mozilla

[21] Bug 561154 - fix specificity of :-moz-any(), Mozilla

[22] Bug 562169 - Implement the :dir(rtl/ltr) selector to select on HTML directionality, Mozilla

[23] Bug 648722 - Add support for :scope as :-moz-scope, Mozilla

[26] Bug 509958 - Remove the -moz prefix from ::selection, Mozilla

[31] Bug 237119 - property 'display' is ignored for generated content, Mozilla

[37] Bug 451134 - change -moz-border-radius* properties to css3-background names, Mozilla

[39] Bug 378217 - implement css3 'border-image' property, Mozilla

[40] Bug 497995 - Implement border-image revisions in latest css3-background, Mozilla

[42] Bug 590039 - fix blur radius computation and rename -moz-box-shadow to box-shadow, Mozilla

[43] Bug 470547 - Spread (4th length) for text-shadow not supported, Mozilla

[45] Bug 613659 - implement box-decoration-break: Left/right part of a box-shadow should only be drawn on the first/last continuation of an inline box, Mozilla

[55] Bug 549809 - Rename background-origin and background-clip properties and values to match css3-background, Mozilla

[61] Bug 3512 - (font-stretch) Implement font-stretch property, Mozilla

[66] Bug 475891 - (unicode-range) implement unicode-range support in user font set, Mozilla

[68] Bug 312156 - implement text-overflow: ellipsis from CSS3 text, Mozilla

[70] Bug 249159 - implement 'word-break' properties of CSS3, Mozilla

[72] hyphens - MDN Docs, Mozilla (Only English)

[73] Bug 587438 - word-wrap, Mozilla

[74] Bug 536557 - Implement CSS3 text-align-last, Mozilla

[76] Bug 276079 - Implement text-justify property(but 'auto', 'inter-word', 'inter-ideograph' and 'distribute' only), Mozilla

[83] Bug 59109 - implement CSS3 text module's text-decoration-style and text-decoration-color, Mozilla

[84] Firefox 6 for developers, Mozilla

[88] Bug 145503 - (writing-mode) CSS3 writing-mode (vertical text), Mozilla

[92] Implement 'box-sizing' (dropping the -moz- prefix), Mozilla

[94] Bug 553576 - Implement css resize property behaviour, Mozilla

[96] Bug 132035 - Implement missing page-break-* CSS2.1 features, Mozilla

[97] Bug 137367 - Implement orphans and widows, Mozilla

[99] Bug 624647 - [CSS] Implement object-fit, Mozilla

[102] Bug 47159 - Support css3-speech (previously Aural Style Sheet) properties in getComputedStyle, Mozilla

[107] Bug 256274 - Implement CSS ruby module, Mozilla

[moz-multicol-110] Bug 684062 - Compare spec and implement CSS multi-column support, Mozilla

[112] Bug 446569 - Implement CSS3 columns shorthand, Mozilla

[113] Bug 549114 - Support Column Breaks, Mozilla

[116] Bug 695222 - Implement column-fill, Mozilla

[117] Bug 616436 - column-span not implemented (css3 multicolumn), Mozilla

[120] Bug 616605 - CSS Grid Layout, Mozilla

[124] Bug 435442 - Implement Webkit's CSS Animation proposal, Mozilla

[moz-trans-129] Bug 435441 - get CSS transitions complete enough to ship, Mozilla

[moz-flexbox-132] Bug 783409 - Turn on CSS flexbox in builds by default (by enabling pref, build flag, etc), Mozilla

[139] Bug 674802 - implement CSS3 Regions, Mozilla

[142] Bug 674804 - implement CSS3 Exclusions, Mozilla

[160] Bug 382721 - Dotted/dashed -moz-border-radiused corners are rendered as solid, Mozilla

[165] Bug 363249 - implement css3-values calc(), Mozilla

[172] Bug 546052 - Support CSS transitions with background-image images (cross-fading), Mozilla

[174] Bug 716628 - Support "turn" unit from CSS3 Values and Units, Mozilla

[175] Bug 435441 - Implement Webkit's CSS Transitions proposal, Mozilla

[181] Bug 773296 - CSS Variables, Mozilla

[182] Bug 282126 - What to do about the 'ch' length unit? (Mozilla vendor specific), Mozilla

[2] Bug 35329 - Enhance CSS parser for Paged Media (Iteration 1), WebKit

[6] Bug 85062 - Support CSS 3 Paged Media Margin Boxes, WebKit

[10] Bug 38731 - Make CSS Parser properly handle only-for-pages pseudo-classes, WebKit

[11] Bug 27458 - Support :default HTML5 CSS selector, Webkit

[13] Bug 27357 - Support :valid/:invalid CSS selectors, Webkit

[15] Bug 29071 - Support for :in-range and :out-of-range CSS selectors, Webkit

[18] Bug 25551 - Support for HTML5 Forms "required" attribute, Webkit

[32] Bug 3409 - CSS1: Safari ignores "text-transform" attribute in "first-line" CSS rules, Webkit

[33] Bug 23209 - [RFE] CSS Generated Content does not transition, Webkit

[38] Bug 27578 - Drop the prefix from the border-radius properties, Webkit

[44] Bug 51448 - Support unprefixed box-shadow property, WebKit

[46] Bug 27576 - [CSS3 Backgrounds and Borders] Implement box-decoration-break, WebKit

[51] Bug 3234 - CSS2: Implement better quote support (for the q tag), Webkit

[56] Bug 27562 - Drop the prefixes from background-clip and background-origin, WebKit

[57] [CSS3 Backgrounds and Borders] Drop the prefix from background-size, WebKit

[60] Bug 15257 - Support CSS 3 font-size-adjust, Webkit

[62] Bug 12530 - CSS3: Support the font-stretch property, Webkit

[64] Bug 63796 - Master: Support CSS3 font feature properties, Webkit

[75] Bug 76173 - CSS3: text-align-last on webkit, Webkit

[77] Bug 18109 - Implement hanging punctuation, Webkit

[85] Bug 58491 - [css3-text] Support text-decoration-* properties from CSS3 Text, Webkit

[89] Bug 46123 - Implement writing-mode support for all of layout (master bug), WebKit

[90] Bug 48538 - Support the text-combine CSS property, WebKit

[93] Bug 36713 - Support box-sizing without the vendor prefix, WebKit

[98] Bug 10894 - CSS "size" property is not supported, Webkit

[103] Bug 46827 - AX: implement CSS3 Speech "speak", WebKit

[114] Bug 15552 - Support CSS3 column-break-before and column-break-after, WebKit

[115] Bug 39498 - [CSS3 Multi-column] Floating elements are rendered below the columns, WebKit

[118] Bug 15550 - WebKit does not support CSS3 column-span:, Webkit

[121] Bug 60731 - Implement CSS3 Grid Layout (master bug), Webkit

[136] Scrolling text with -webkit-marquee, Ajnaware, 2008-08-14

[161] Bug 25016 - max-width and max-height are not overriding the width and height properties when 'display' set to 'table', Webkit

[162] Bug 8735 - CSS 2.1 visibility: collapse rendered as visibility: hidden, Webkit

[166] Bug 16662 - CSS3: Implement calc(), Webkit

[171] Fraser, Simon (2011-01-14). "CSS3 Gradients". Surfin’ Safari. WebKit. Retrieved 2011-01-16.

[176] Bug 78295 - Support for CSS rem unit in Media Queries, Webkit

[178] Bug 27160 - Implement vw/vh/vm (viewport sizes) from CSS 3 Values and Units, Webkit

[179] Bug 91440 - Implement 'vmin' and 'vmax' from CSS3 values and units, Webkit

[47] Storey, David (2010-11-23). "First browser to 11 (unless Chrome gets there first)". Opera. Retrieved 2010-11-23.

[69] Haavard (2010-08-09), New 10.70 snapshot with more Presto updates, Opera

[100] Haavard (2010-08-03), Presto update for Opera 10.70, Opera

[111] "CSS Multi-column Layout Module support in Opera Presto 2.8". Opera. 2011-03-06. Retrieved 2011-03-06.

[163] Koch, Peter-Paul, :before/:after and content, Quirksmode

[177] Lawson, Bruce (2011-12-06). "Hello Opera 11.60!". Opera. Retrieved 2012-05-05.

[183] Quantization error for em values in Opera 7–9.2, archived from the original on 2008-03-21

[prince-24] Prince: Unsupported features in CSS 2.1, YesLogic

[25] ttp://www.w3.org/TR/css3-lists/

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