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

Engine nomenclature

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	Used by
Trident	Internet Explorer and other Internet Explorer shells (Microsoft Windows operating systems only)
Tasman	Mac OS X versions of Internet Explorer and MSN
Gecko	All Mozilla software, including Firefox; SeaMonkey; Galeon; Camino; K-Meleon; Flock; also Epiphany-gecko
WebKit	Apple Safari; Google Chrome; Shiira; iCab 4; OmniWeb 5.5+; Epiphany; Adobe AIR; Midori; Adobe Dreamweaver CS4
KHTML	Konqueror
Presto	Opera; Opera Mobile, Nintendo DS Browser; Internet Channel; future Adobe Systems products
iCab	iCab 1-3
Prince XML	Prince

Values

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.

CSS version support

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See the article Cascading Style Sheets for more information on the different versions of CSS. This table doesn't reference CSS2.0, as CSS2.1 was intended to replace it by correcting or removing a few errors and features rejected by the CSS community. Most of the removed CSS2 features will be made obsolete by CSS3.

	Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML
CSS1	7.0	0	1.0	85	Yes	1.0	Yes	1.0
CSS2.1	Mostly	Partial	Mostly	Mostly	Mostly	Mostly	Mostly	Mostly
CSS3	Slight	Slight	Partial	Partial	Slight	Partial	Slight	Slight

Grammar and rules

			Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML
CSS2	!important	Weight increasing	Incorrect	0	1.0	85	Yes	1.0	Yes	Yes
	/*Comment*/	Comments	3.0	0	1.0	85	Yes	1.0	Yes	Yes
	@import	Import stylesheet	Incorrect	0	1.0	Yes	Yes	1.0	Yes	2.1
	@charset	Character set	5.5	?	1.0	0	4.2.3	1.0	Yes	Yes
	@media	Media-specific rules	Incorrect	0.9	1.0	Yes	Yes	1.0	3.0	5.1
	@page	For paged media	Incorrect	No	No	No	No	1.0	No	6.0
CSS3	@namespace	Namespace declaration	No	No	1.0	Yes	Yes	1.0	No	5.0
	@font-face	Define font	Incorrect	No	1.9.1	525	4.3	2.2	No	6.0

Trident grammar and rule notes

1. !important — In 8.0, rules with !important are ignored inside :first-line and :first-letter declarations. See Bug 478138 on Connect.
2. !important — Prior to 7.0, !important doesn't override rules defined later in the same declaration block.
3. @import — Limited to 35 imported stylesheets, after that, rules stops applying.
4. @import — Prior to 8.0, media type support is broken. For @import <URL> <MEDIA>, IE requests as the URL "<URL> <MEDIA>" and will include url() and/or quotes in the URL, too, if present.
5. @font-face — Only supports Embedded OpenType (.eot) font format, does not understand the format() identifier.

Tasman grammar and rule notes

1. @font-face — Versions 5.16 and 5.17 will download fonts specified but not use them. 5.23 no longer downloads the font.

Presto grammar and rule notes

1. @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

			Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML
Element selectors
CSS2	*	Universal	7.0	0	1.0	85	Yes	1.0	3.0	Yes
	E	Element	4.0	0	1.0	85	Yes		Yes	Yes
	E.class	Class	7.0	Incorrect	1.0	85	Yes		Yes	Yes
	E#id	ID	4.0	0	1.0	85	Yes		Yes	Yes
CSS3	ns|E	Namespaced	No	No	1.0	Yes	Yes		No	Yes
Relationship selectors
CSS2	E F	Descendant	4.0	0	1.0	85	Yes	1.0	Yes	Yes
	E > F	Child	7.0	0	1.0	85	Yes		3.0	Yes
	E + F	Direct adjacent	7.0	0	1.0	85	Yes		3.0	Yes
CSS3	E ~ F	Indirect adjacent	7.0	0.9	1.7	412	3.3.2	2.0	3.0	Yes
Attribute selectors
CSS2	E[attr]	Has	7.0	0.9	1.0	85	Yes	1.0	3.0	Yes
	E[attr="value"]	Equals	7.0	0.9	1.0	Yes	Yes		3.0	Yes
	E[attr~="value"]	Contains (space-separated)	7.0	0.9	1.0	Yes	Yes		3.0	Yes
	E[attr|="value"]	Contains (hyphen-separated)	7.0	0.9	1.0	Yes	Yes		3.0	Yes
CSS3	E[attr^="value"]	Begins with	7.0	No	1.0	Yes	3.4	1.0	3.0	Yes
	E[attr$="value"]	Ends with	7.0	No	1.0	Yes	3.4	2.0	3.0	Yes
	E[attr*="value"]	Contains substring	7.0	No	1.0	Yes	3.4		3.0	Yes
	E[ns|attr]	Namespaced	7.0	No	1.0	Yes	3.4		No	No
Pseudo-classes
CSS2	E:link	Unvisited hyperlink	3.0	0	1.0	85	Yes	1.0	Yes	6.0
	E:visited	Visited hyperlink	3.0	0	1.0	85	Yes		Yes	Yes
	E:active	Active	Incorrect	0	1.0	85	Yes		Yes	Yes
	E:hover	Mouseover	7.0	0.9	1.0	419.3	Yes		3.0	Yes
	E:focus	Focused	8.0	0	1.0	Yes	Yes		Yes	Yes
	E:first-child	First child	7.0	0	1.0	85	Yes		3.0	Yes
	E:lang()	Language	8.0	0	1.2	525	3.4		3.0	Yes
	@page:first	First page	8.0	No	No	No	No		No	Yes
	@page:left	Left page
	@page:right	Right page
CSS3	E:root	Root	9.0	0.1	1.0	85	3.4	2.1	No	Yes
	E:not()	Negation		0.9
	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	Nth child			1.9.1
	E:nth-last-child	Nth last child			1.9.1
	E:nth-of-type	Nth child of type			1.9.1
	E:nth-last-of-type	Nth last child of type			1.9.1
	E:target	Target			1.3			Partial		No
	E:enabled	Enabled state			1.8			2.0
	E:disabled	Disabled state			1.8
	E:checked	Checked state		No	1.0
	E:indeterminate	Indeterminate state	No	0.9	1.9.2	522	No	No
	E:default	Default		No	1.9	528+	4.3	2.0
	E:valid	Valid			1.8	528+	No
	E:invalid	Invalid
	E:in-range	In range				No
	E:out-of-range	Out of range
	E:required	Required			No	528+
	E:optional	Optional
	E:read-only	Read-only			Experimental	No	Incorrect	Incorrect
	E:read-write	Read and write
Pseudo-elements
CSS2	E:first-letter	First letter	5.5	0	1.0	85	Yes	1.0	3.0	5.0
	E:first-line	First line	5.5			Partial				No
	E:before	Before	8.0	No	1.9.1	85				Yes
	E:after	After
CSS3	E::before	Double colon notation	9.0	No	1.9.1	85	3.4	1.0	Yes	Yes
	E::after	Double colon notation
	E::first-letter	Double colon notation		0.9	1.5
	E::first-line	Double colon notation				Partial				No
	E::selection	Selection	No		Experimental	412		2.1	No
			Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML

General selector notes

1. :read-only and :read-write — Both Presto and KHTML handles the case of the contenteditable attribute incorrectly.

Trident selector notes

1. :active — In 8.0, the behaviour will not work if a child element is active and the actual element isn't.
2. :active — Prior to 8.0, :active is only supported on anchor elements.
3. :hover — Prior to 7.0, :hover is only supported on anchor elements.
4. .one.two — Prior to 7.0, only .two class selector was taken into consideration.
5. * — Prior to 7.0 this was treated as a single or no element.
6. [attr] — Matches every td and th in a table when the attribute is colspan (regardless of whether any actually have a colspan attribute). This may not actually be a bug, as ambiguity exists in the specification.
7. :first-letter — In 6.0, combining :first-letter rules with others may be problematic.

Tasman selector notes

1. :hover — For anchor element only prior to 0.9.
2. .one.two — only .two class selector is taken into consideration.

Gecko selector notes

1. (:):before, (:):after — CSS2.0 behavior : some properties are unimplemented prior to 1.9.1. See Bug 237119 on Bugzilla.

WebKit selector notes

1. :lang() — Only detected when explicitly present on element being tested, attribute not inherited.
2. (:):first-line — text-transform doesn't apply with this pseudo-element. See Bug 3409 on Bugzilla.

Presto selector notes

1. :target — Style doesn't get applied when navigating using back and forward buttons.

Properties

		Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML
Box Model
CSS2	margin	Incorrect	0	1.0	85	Yes	1.0	3.0	Yes
	padding	4.0	0	1.0	85	Yes		3.0	Yes
	width	4.0	0	1.0	85	Yes		3.0	Yes
	height	4.0	0	1.0	85	Yes		3.0	Yes
	float	5.0	0	1.0	85	Yes		3.0	Yes
	clear	5.0	0	1.0	85	Yes		Yes	Yes
	display	8.0	Partial	Partial	Incorrect	Yes		Partial	Yes
	min-width	7.0	0.9	1.0	416	Yes		3.0	5.0
	max-width	Incorrect	0.9	1.0	416	Yes		3.0	5.0
	min-height	7.0	0.9	1.7	416	3.3.2		3.0	5.0
	max-height	Incorrect	0.9	1.7	416	3.3.2		3.0	5.0
	clip	8.0	0.9	1.0	85	Yes		3.0	5.0
	overflow	Incorrect	0	1.0	85	3.2		3.0	5.0
	visibility	Incorrect	0.9	1.8	Partial	Partial	Partial	Partial	5.0
CSS3	overflow-x	Incorrect	No	1.8	525	3.5.6	2.1	No	5.0
	overflow-y	Incorrect	No	1.8	525	3.5.6		No	5.0
Borders
CSS2	border	4.0	0	1.0	85	Yes	1.0	3.0	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	No	Experimental	Experimental (528+)	Experimental	2.5	No	6.0
	border-break	No		No	No	No	No		No
	border-image	No		Experimental	Experimental	No	2.5		No
	box-shadow	No		Experimental	Experimental	No	2.5		No
	box-decoration-break	No		No	No	No	No		No
column reminder		Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML
Line Layout
CSS2	line-height	4.0	0	1.0	85	Yes	1.0	Yes	5.0
	vertical-align	8.0	0	1.0	85	Yes		3.0	6.0
Positioning
CSS2	position	7.0	0	1.0	85	Yes	1.0	3.0	5.0
	top	8.0	Partial	1.0	85	Yes		3.0	6.0
	right	8.0	Partial	1.0	85	Yes		3.0	6.0
	bottom	8.0	Partial	1.0	85	Yes		3.0	6.0
	left	8.0	Partial	1.0	85	Yes		3.0	6.0
	z-index	8.0	Partial	1.9	85	Yes		3.0	6.0
Generated and Replaced Content
CSS2	quotes	8.0	0.9	1.8	No	3.4	1.0	3.0	5.0
	content	Incorrect	No	1.9	Partial	Yes	Partial	3.0	5.0
	counter-increment	8.0	No	1.8	525	3.4	1.0	3.0	5.0
	counter-reset	8.0	No	1.8	525	3.4		3.0	5.0
Lists
CSS2	list-style	4.0	0	1.0	85	Yes	1.0	3.0	6.0
	list-style-image	4.0	0	1.0	85	Yes		3.0	6.0
	list-style-position	4.0	0	1.0	85	Yes		3.0	6.0
	list-style-type	8.0	0	1.0	85	3.4		3.0	6.0
Colors
CSS2	color	3.0	0	1.0	85	Yes	1.0	Yes	5.0
CSS3	opacity	No	No	1.7	125	4.0	2.0	No	6.0
column reminder		Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML
Backgrounds
CSS2	background	Incorrect	0	1.0	85	Yes	1.0	Yes	6.0
	background-attachment	7.0	0	1.0	85	Yes		Yes	5.0
	background-color	4.0	0	1.0	85	Yes		3.0	3.1
	background-image	8.0	0	1.0	85	Yes		Yes	6.0
	background-position	8.0	0	1.0	85	Yes		Yes	3.1
	background-repeat	4.0	0	1.0	85	Yes		Yes	3.1
CSS3	background (multiple)	No	No	1.9.2	312	3.5	2.5	No	No
	background-clip	No	No	Experimental	Experimental	Experimental		No	No
	background-origin	No	No	Experimental	Experimental	Experimental		No	No
	background-break	No	No	No	No	No	No	No	No
	background-size	No	No	Experimental	Experimental	Experimental	Experimental	No	No
Fonts
CSS2	font	Incorrect	0	1.0	Partial	Yes	Incorrect	Yes	Yes
	font-family	Incorrect	0	1.0	85	Yes	1.0	Yes	Yes
	font-size	3.0	0	1.0	Partial	Yes		Yes	3.1
	font-style	4.0	0	1.0	85	Yes		Yes	Yes
	font-variant	4.0	0	1.0	125	Yes		3.0	Yes
	font-weight	8.0	0	Partial	Partial	Yes	Incorrect	Incorrect	Yes
CSS3	font-size-adjust	No	No	1.9	No	No	No	No	No
	font-stretch	No	No	No	No	No	No	Incorrect	6.0
	font-effect	No	No	No	No	No	No	No	No
	font-smooth	No	No	No	No	No	No	No	No
	font-emphasize	No	No	No	No	No	No	No	No
column reminder		Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML
Text
CSS2	text-align	4.0	0	1.0	85	Yes	1.0	Partial	Yes
	text-decoration	Incorrect	0	1.0	85	Yes		3.0	3.1
	text-indent	3.0	0	1.0	85	Yes		Yes	Yes
	text-transform	4.0	0	1.0	Partial	Yes		Yes	6.0
	letter-spacing	4.0	0	1.0	85	Yes		Yes	5.
	word-spacing	8.0	Partial	1.0	85	Yes		Yes	5.0
	white-space	8.0	Partial	1.9.1	85	Yes	2.1	Yes	6.0
	direction	5.0	0	1.0	85	Yes	1.0	No	7.0
	unicode-bidi	5.0	0	1.0	525	Yes		No	7.0
CSS3	text-shadow	No	No	1.9.1	Yes	3.4	2.1	3.0.3	No
	text-overflow	Partial	No	No	Partial	3.5.6	Experimental	No	No
	word-break	Partial	No	No	No	No	No	No	No
	text-wrap	No	No	No	No	No	No	No	No
	word-wrap	5.0	No	1.9.1	85	4.3	No	No	No
	text-align-last	Partial	No	No	No	No	No	No	Partial
	text-justify	5.5	No	No	No	No	No	No	6.0
	punctuation-trim	No	No	No	No	No	No	No	No
	text-emphasis	No	No	No	No	No	No	No	No
	text-outline	No	No	No	No	No	No	No	No
	hanging-punctuation	No	No	No	No	No	No	No	No
Tables
CSS2	border-collapse	8.0	0.9	1.0	125	Yes	1.0	3.0	5.1
	border-spacing	8.0	0.9	1.0	125	Yes		3.0	6.0
	caption-side	8.0	0.9	1.4	85	Yes		CSS2.1	5.0
	empty-cells	8.0	0.9	1.0	125	Yes		Incorrect	5.0
	table-layout	5.0	0	1.0	85	Yes		3.0	6.0
User interface
CSS2	cursor	Incorrect	0	1.8	125	Yes	Partial	3.0	Yes
	outline	8.0	0	1.8	125	Yes	1.0	3.0	No
	outline-color	8.0	0	1.8	125	Yes		3.0	No
	outline-style	8.0	0	1.8	125	Yes		3.0	No
	outline-width	8.0	0	1.8	125	Yes		3.0	No
CSS3	outline-offset	No	No	1.8	125	3.5	2.1	No	No
	outline-radius	No	No	Experimental	No	No	No	No	No
	box-sizing	8.0	0	Experimental	Experimental	3.3.2	1.0	No	7.0
	resize	No	No	No	525	No	No	No	No
	appearance	No	No	Experimental	Experimental	No	No	No	No
	icon	No	No	No	No	No	No	No	No
	nav-index	No	No	No	No	No	2.1	No	No
	nav-up	No	No	No	No	No		No	No
	nav-right	No	No	No	No	No		No	No
	nav-down	No	No	No	No	No		No	No
	nav-left	No	No	No	No	No		No	No
column reminder		Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML
Paged media
CSS2	orphans	8.0	No	No	312	3.5	1.0	No	6.0
	page-break-after	4.0	No	Partial	Partial	3.5		No	6.0
	page-break-before	4.0	0	Partial	Partial	3.5		No	6.0
	page-break-inside	8.0	No	No	312	3.5		No	6.0
	widows	8.0	No	No	312	3.5		No	6.0
CSS3	page	No	No	No	No	No	No	No	Yes
	size	No	No	No	No	No	1.0	No	6.0
	image-orientation	No	No	No	No	No	No	No	No
	fit	No	No	No	No	No	No	No	No
	fit-position	No	No	No	No	No	No	No	No
Speech
CSS3	voice-volume	No	No	No	No	No	Experimental	No	No
	voice-balance
	speak
	pause
	pause-after
	pause-before
	rest						No
	rest-before
	rest-after
	cue						Experimental
	cue-after
	cue-before
	mark						No
	mark-before
	mark-after
	voice-family						Experimental
	voice-rate
	voice-pitch
	voice-pitch-range
	voice-stress
	voice-duration
	phonemes
column reminder		Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML
Media Queries
CSS3	width	No	No	1.9.1	525	4.1	2.0	No	?
	height				525	4.1			?
	device-width				525	4.1			?
	device-height				525	4.1			?
	orientation				No	4.2.1	?		?
	aspect-ratio				No	4.2.1	?		?
	device-aspect-ratio				525	4.1	2.0		?
	color				525	4.1			?
	color-index				525	4.1			?
	monochrome				525	4.1			?
	resolution				No	4.1			?
	scan			No	No	4.1	No		?
	grid			No	No	4.1	2.0		?
Ruby characters
CSS3	ruby-position	5.0	0	No	No	No	No	No	No
	ruby-align
	ruby-overhang
	ruby-span	No	No
Multi-column Layout
CSS3	column-count	No	No	Experimental	Experimental	No	No	No	Yes
	column-width
	column-gap
	column-rule
	columns			No
	column-break-before			No					6.0
	column-break-after
	column-break-inside
	column-fill				No
	column-span				No				No
Animation
CSS3
	animation	No	No	No	Experimental	No	No	No	No
	animation-delay
	animation-direction
	animation-duration
	animation-iteration-count
	animation-name
	animation-play-state
	animation-timing-function
2D Transforms
CSS3
	transform	No	No	Experimental	Experimental	No	2.5 (Experimental)	No	No
	transform-origin
3D Transforms
CSS3
	transform	No	No	No	Experimental	No	No	No	No
	transform-origin
	transform-style
	perspective
	perspective-origin
	backface-visibility
Transitions
CSS3
	transition-property	No	No	1.9.3 (Experimental)	Experimental	No	2.5 (Experimental)	No	No
	transition-duration
	transition-timing-function
	transition-delay
	transition
Flexible Box Layout
CSS3
	box-align	No	No	Experimental	Experimental	No	No	No	No
	box-direction
	box-flex
	box-flex-group
	box-lines
	box-ordinal-group
	box-orient
	box-pack
Marquee
CSS3
	marquee-direction	No	No	No	No	No	No	No	No
	marquee-play-count
	marquee-speed
	marquee-style
	overflow-style

Trident property notes

1. margin — inherit inherits the computation and recomputes it instead of inheriting the computed value. See Bug 344787 on Connect.
2. display — Prior to 8.0, run-in and table are not supported, while inline-block is only supported on elements that are naturally inline.
3. display — Prior to 7.0, only none, block, inline, table-header-group, and table-footer-group are fully supported.
4. overflow — In 8.0, scroll makes the element's height equal to its max-height even if the content isn't that tall. See Bug 408759 on Connect.
5. overflow — Prior to 7.0, overflow:visible is incorrectly supported.
6. visibility — In 8.0, inline elements with visible inside block elements with hidden are not visible. See Bug 442805 on Connect.
7. visibility — Prior to 8.0, collapse is not supported.
8. content — In 8.0, computed attr() values are not updated when the attribute changes. See Bug 434925 on Connect.
9. border-color — Prior to 7.0, transparent is not supported.
10. border-style — Prior to 8.0, hidden is not supported.
11. border-style — Prior to 7.0, dotted is rendered as dashed.
12. box-shadow — Not supported. Trident supports similar functionality since 5.5 using the proprietary Shadow and DropShadow filters.
13. position — Prior to 7.0, fixed positioning was not supported. 7.0 and later support it in standards-compliant mode only.
14. z-index — In 8.0, floating point values are accepted in addition to integers. See Bug 386914 on Connect.
15. z-index — Prior to 8.0, z-index is only partially supported.
16. list-style-type — Prior to 8.0, armenian, decimal-leading-zero, georgian, lower-greek, lower-latin, upper-latin are not supported.
17. opacity — isn't implemented. Trident supports a proprietary alternative (not understood by other layout engines) since 5.5.
18. background-image — Prior to 8.0, background images are badly positioned in some cases.
19. background-attachment — Prior to 7.0, fixed was allowed on the body element only.
20. background-position — Prior to 8.0, fixed positioning is not supported.
21. font-weight — Prior to 8.0, incorrect rendering when value is 600.
22. text-align — In 8.0, text-align isn't inherited by :before and :after pseudo-elements. See Bug 454985 on Connect.
23. text-decoration — underline is not drawn across inline replaced elements (e.g. images). See Bug 467666 on Connect.
24. text-decoration — blink is supported but does not blink the text, as allowed by CSS 2.1.
25. white-space — Prior to 8.0, white-space is only partially supported; pre-line and pre-wrap are not supported.
26. white-space — Prior to 6.0, pre is not supported.
27. cursor — Does not fail on non-prefixed vendor extensions.

Gecko property notes

1. display — run-in is unsupported. inline-table and inline-block are supported in Gecko 1.9a2+.
2. z-index — Negatives values are badly supported prior to 1.9.
3. quotes — Does not support nested quotes prior to 1.8.
4. content — none value is unsupported prior to 1.9.
5. background-position — Versions prior to 1.7 implement the CSS2 syntax, not the proposed CSS2.1 expanded syntax.
6. font-size-adjust — Prior to 1.9, supported on Windows only.
7. font-weight — Only Regular and Bold weights get used, even if Light or Heavy/Black faces are installed.
8. 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.
9. visibility — collapse is unsupported prior to 1.8.
10. 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.
11. page-break-before; page-break-after — Only the always and auto values are supported.

WebKit property notes

1. font — The system font keywords that allow designers to tailor presentation to the user's operating system environment are unsupported.
2. font-weight — Only Regular and Bold weights get used, even if Light or Heavy/Black faces are installed.
3. page-break-before; page-break-after — Only the always and auto values are supported.
4. text-decoration — Optional property blink is unsupported.
5. white-space — pre-line and pre-wrap are unsupported.
6. visibility — collapse is unsupported prior to 522. Its implementation has the same effect as hidden and is therefore not compliant.
7. content — The none, open-quote, close-quote, no-open-quote, no-close-quote and normal values is unsupported.
8. 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

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

Presto property notes

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

iCab property notes

1. display — run-in is not supported.
2. text-align — justify is not supported.
3. font-stretch — Simulated using letter-spacing property.
4. font-weight — Incorrect (bold) rendering when value is 500.
5. visibility — collapse only partial.
6. caption-side — top and bottom only which would comply with the proposed CSS2.1 elimination of the values: left and right.
7. empty-cells — Compresses hidden rows but does not hide them completely.

Values and units

			Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML
Numbers
CSS2	<number>	A floating-point number	3.0	0	1.0	85	Yes	1.0	Yes	6.0
	<length>	<number> followed by units
	<percentage>	<number> followed by %
	<integer>	An integer
CSS3	<angle>	<number> angle-unit	No	No	Partial	Partial	Partial	2.5	No	No
		<number> time-unit			1.9.3	Yes	Yes
	<frequency>	<number> frequency-unit
	<fraction>	Remaining space			No	No	No	No
Strings
CSS2	<string>	String	3.0	0	1.0	85	Yes	1.0	Yes	Yes
	\code	Unicode escapes	6.0	0.9
Shapes
CSS2	rect()	A rectangle	8.0	0	1.0	85	Yes	1.0	Yes	Yes
Functions
CSS2	url()	Uniform Resource Identifier	3.0	0	1.0	85	Yes	1.0	Yes	Yes
	counter()		8.0	No					?
	attr()	Attribute identifier							Yes
CSS3	calc()		No	No	No	No	No	No	No	No
Colors
CSS2	HTML4 color keywords	16 predefined web colors	3.0	0	1.0	85	Yes	1.0	Yes	Yes
	#rrggbb or #rgb	Hexadecimal notation
	rgb(r,g,b)	RGB notation	4.0
	system colors	28 predefined system colors	3.0
CSS3	SVG color keywords		Partial	?	Yes	Yes	Yes	Yes	?	?
	currentColor	The value of the ‘color’ property.	No	No	1.8	528	Yes	2.1	?	?
	rgba(r,g,b,a)	RGBA notation			1.9	525	4.0	2.2	No	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
	transparent	Full transparency	Partial	0	1.9		4.0	Partial	Partial	Partial
Keywords
CSS2	auto	Automatically calculated	6.0	0	1.0	85	Yes	1.0	Yes	Yes
	inherit	Inherited from the parent	Incorrect	?
CSS3	initial		No	No	Experimental	125	No	No	No	No
Units
CSS2	px	Pixel	3.0	0	1.0	85	Yes	1.0	Yes	Yes
	pt	Point
	pc	Pica
	cm	Centimetre
	mm	Millimetre
	in	inch
	em	em
	ex	ex
	%	Percentage
CSS3	deg	Degree	No	No	1.9.1	Yes	Yes	2.5	No	No
	grad	Grad
	rad	Radian
	turn	turn			No	No	No	No
	ms	Millisecond			1.9.3	Yes	Yes	2.5
	s	Second
	Hz	Hertz
	kHz	Kilohertz
	dpi	Dots per inch			No	No	4.1	No
	dpcm	Dots per centimetre			No	No	4.1	No
	dppx	Dots per pixel-unit			No	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			1.9.2	No	No	No
	vw	the viewport's width			No	No	No	No
	vh	the viewport's height
	vm	the viewport's height or width, whichever is smaller of the two
	ch	the width of the "0" (ZERO, U+0030) glyph found in the font for the font size used to render.			1.9.1	No	No	No
			Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML

General value and unit notes

1. 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.

2. <angle> — The turn unit is unsupported.

Trident value and unit notes

1. rect() — Prior to 8.0, rect() was not supported with the correct syntax using commas.
2. auto — In quirks mode (IE5 emulation mode), auto does not work for margins, except table elements.
3. transparent — Using transparent in the color property will render the text as black.
4. 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

1. <ch> — Prior to version 1.9.1, uses the width of the "M" glyph instead of the width of the "0" glyph.

Presto value and unit notes

1. <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).
2. 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.

Image Values

			Trident	Tasman	Gecko	WebKit	KHTML	Presto	iCab	Prince XML
CSS2	<url>	Image types	3.0	0	1.0	85	Yes	1.0	Yes	Yes
CSS3	<sprite>		No	No	?	?	No	No	No	No
	<image-list>				?	?
	<linear-gradient>				Experimental	Experimental
	<radial-gradient>
	linear-gradient()	Color gradients
	radial-gradient()
	repeating-linear-gradient()					No
	repeating-radial-gradient()

General notes

Gecko general notes

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

Trident general notes

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

WebKit general notes

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

KHTML general notes

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

Presto general notes

1. -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.
2. -o- — All experimental properties are prefixed with "-o-", e.g. -o-transition-property instead of transition-property.

DOM equivalents to vendor-specific styles

1. The DOM properties corresponding to vendor-specific experimental CSS properties are prefixed with the vendor-prefix, without any hyphens, and with first letter capitalised, e.g. element.style.MozBorderRadius corresponding to the -moz-border-radius property, or element.style.OTransform corresponding to the -o-transform property.

References

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External links

• WebDevout — mostly covers Windows browsers. Extensive bug testing.
• QuirksMode — comprehensive but lacks latest versions.