Cascading Style Sheets
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1 Explanation of the tables
- 1.1 Engine nomenclature
- 1.2 Values
2 CSS version support
3 Grammar and rules
- 3.1 Trident grammar and rule notes
- 3.2 Presto grammar and rule notes
4 Selectors
5 Properties
6 Values and units
7 General notes
8 References
9 External links

Layout engine	Release version	Preview version	Used by
Amaya	11.3.1	11.3-pre	Amaya
Gecko	5.0	7.0a1	All Mozilla software, including Firefox; SeaMonkey and Galeon; Camino; K-Meleon; Flock (up to 2.x); Epiphany-gecko; GNU IceCat (formerly IceWeasel); Icedove, Iceape and Iceowl; Fennec (for Android and Nokia N900 only)
KHTML		N/A	Konqueror
Presto	2.9.168	2.9.168	Opera; Opera Mobile, Nintendo DS & DSi Browser‎; Internet Channel
Prince	7.1	N/A	Prince XML
Tasman	(IE 5.2.3 for Mac)	none (aborted in 2003W)	Internet Explorer 5+ for Mac OS X
Trident	5.0 (IE 9)	6.0 (IE 10)	Internet Explorer and other Internet Explorer shells like Maxthon (Microsoft Windows operating systems only)
WebKit	534.20	r83424	Google Chrome, Maxthon 3, Safari (both desktop and mobile), Shiira, iCab 4, OmniWeb 5.5+, Epiphany, Adobe AIR, Midori, Adobe Dreamweaver CS4 and CS5, Android browser, Palm webOS browser, Symbian S60 browser, OWB, Steam, Rekonq, Arora, Flock (version 3+), RockMelt

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.

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

			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	0	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	No^{[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
	`@font-face`	Define font	9.0^{[t 1]}^{[t 1]}	1.9.1	525	4.3	2.2	6.0
	`@phonetic-alphabet`	Phonetic pronunciation	No	No	No	No	No	No
			Trident	Gecko	WebKit	KHTML	Presto	Prince XML

			Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Element selectors^{[spec 1]}
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
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 1]}	Yes^{[w 2]}	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 3]}	4.3	2.0
	`E:valid`	Valid		1.8	Yes^{[w 4]}	No
	`E:invalid`	Invalid			Yes^{[w 4]}
	`E:in-range`	In range			Yes^{[w 5]}
	`E:out-of-range`	Out of range			Yes^{[w 5]}
	`E:required`	Required		2.0^{[g 2]}	Yes^{[w 6]}
	`E:optional`	Optional		2.0^{[g 2]}	Yes^{[w 6]}
	`E:read-only`	Read-only		Experimental	No	Incorrect	Incorrect
	`E:read-write`	Read and write		Experimental	No	Incorrect	Incorrect
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::selection`	Selection		Experimental	412		2.1	No
			Trident	Gecko	WebKit	KHTML	Presto	Prince XML

		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Box Model^{[spec 2]}
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	Partial	85	Yes		Yes
	`min-width`	7.0	1.0	416	Yes		5.0
	`max-width`	7.0	1.0	416	Yes		5.0
	`min-height`	7.0	1.7	416	3.3.2		5.0
	`max-height`	7.0	1.7	416	3.3.2		5.0
	`clip`	8.0	1.0	85	Yes		5.0
	`overflow`	9.0	1.0	85	3.2		5.0
	`visibility`	9.0	1.8	Partial	Partial	2.5	Partial
CSS3	`overflow-x`	9.0	1.8	525	3.5.6	2.1	5.0
CSS3	`overflow-y`	9.0	1.8	525	3.5.6	2.1	5.0
Borders^{[spec 3]}
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 4]}	533^{[w 9]}	Experimental	2.5	6.0
	`border-image`	No	Experimental	Experimental	No	2.5	No
	`border-image-source`		No	No		No
	`border-image-slice`
	`border-image-width`
	`border-image-outside`
	`border-image-repeat`
	`box-shadow`	9.0	2.0^{[g 5]}	Yes^{[w 10]}	No	2.5	No
	`box-decoration-break`	No	No	No	No	2.7^{[p 1]}	No
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Line Layout^{[spec 4]}
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
Generated and Replaced Content^{[spec 5]}
CSS2	`quotes`	8.0	1.8	Nightly build^{[w 11]}	3.4	1.0	No
	`content`	9.0^{[t 6]}	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 6]}
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 7]}
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 3]}
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 6]}	Yes^{[w 12]}	Experimental
	`background-origin`			Yes^{[w 12]}
	`background-size`			Yes^{[w 13]}
Fonts^{[spec 8]}
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`	No	1.9	No^{[w 14]}	No	No	No
	`font-stretch`	9.0^{[t 1]}	No^{[g 7]}	No^{[w 15]}	No	No	6.0
	`font-feature-settings`	No	Experimental	No^{[w 16]}	No	No	No
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Text^{[spec 9]}
CSS2	`text-align`	4.0	1.0	85	Yes	1.0	Yes
	`text-decoration`	Yes	Incorrect	Incorrect	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-shadow`	No	1.9.1	Yes	3.4	2.1	No
	`text-overflow`	Partial	Nightly build^{[g 8]}	Partial	3.5.6	Experimental (Nightly)^{[p 2]}	No
	`word-break`	Partial	No^{[g 9]}	No	No	No	No
	`hyphens`	No	Nightly build^{[g 10]}	Nightly build	No	No	No
	`hyphenate-characters`	No	No	No	No	No	No
	`hyphenate-limit-zone`
	`hyphenate-limit-word`
	`hyphenate-limit-lines`
	`hyphenate-limit-last`
	`hyphenate-resource`
	`text-wrap`	No	No	No	No	No	No
	`word-wrap`	5.0	1.9.1	85	4.3	2.5	No
	`text-align-last`	Partial	No	No	No	No	Partial
	`text-align-first`	No	No	No	No	No	No
	`text-justify`	5.5	No^{[g 11]}	No	No	No	6.0
	`punctuation-trim`	No	No	No	No	No	No
	`text-emphasis`	No	No	No	No	No	No
	`text-outline`	No	No^{[g 12]}	Experimental^{[w 17]}^{[w 18]}	No	No	No
	`hanging-punctuation`	No	No	No^{[w 19]}	No	No	No
	`text-decoration-style`	No	Nightly build^{[g 13]}^{[g 14]}	No	No	No	No
	`text-decoration-color`	No		No	No	No	No
	`text-decoration-line`	No		No	No	No	No
	`text-decoration-skip`	No	No	No	No	No	No
	`text-underline-position`	No	No	No	No	No	No
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Writing Modes^{[spec 10]}
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 7]}	No^{[g 15]}	Nightly Build^{[w 20]}	No	No	No
CSS3	`text-combine`	No	No	No^{[w 21]}	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 11]}
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 16]}	Yes^{[w 22]}	3.3.2	1.0	7.0
	`resize`	No	2.0^{[g 17]}	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 12]}
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	No^{[g 18]}	312			6.0
	`orphans`		No^{[g 19]}				6.0
	`widows`		No^{[g 19]}				6.0
CSS3	`page`	No	No	No	No	No	Yes
	`size`	No	No	No^{[w 23]}	No	1.0	6.0
	`image-orientation`	No	No	No	No	No	No
	`object-fit`	No	No	No	No	2.7^{[p 3]}	No
	`object-position`	No	No	No	No	2.7^{[p 3]}	No
Speech^{[spec 13]}
CSS3	`cue`	No	No^{[g 20]}	No	No	1.0	No
	`cue-after`
	`cue-before`
	`pause`
	`pause-after`
	`pause-before`
	`speak`			Nightly build^{[w 24]}
	`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 14]}
CSS3	`width`	9.0^{[t 1]}	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		4.1	2.5
	`scan`		No		4.1	2.5
Ruby characters^{[spec 15]}
CSS3	`ruby-position`	5.0	No^{[g 21]}	No	No	No	No
	`ruby-align`
	`ruby-overhang`
	`ruby-span`	No
Multi-column Layout^{[spec 16]}
CSS3	`column-count`	Platform Preview	Experimental	Experimental	No	2.8^{[p 4]}	Yes
	`column-width`
	`column-gap`
	`column-rule`
	`columns`		No^{[g 22]}
	`break-before`	No	No	Experimental^{[w 25]}			6.0
	`break-after`			Experimental^{[w 25]}
	`break-inside`			No^{[w 26]}
	`column-fill`	Platform Preview		No
	`column-span`	Platform Preview		Experimental^{[w 27]}			No
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Grid layout^{[spec 17]}
CSS3	`Grid`	Platform Preview^{[g 23]}	No^{[g 24]}	No^{[w 28]}	No	No	No
	`grid-rows`
	`grid-columns`
	`grid-row`
	`grid-column`
	`grid-cell-stacking`
	`grid-template`
	`grid-column-span`
	`grid-row-span`
	`grid-column-sizing`
	`grid-row-sizing`
	`grid-flow`
	`grid-column-align`
	`grid-row-align`
	`grid-layer`
Animation^{[spec 18]}
CSS3
	`animation`	No	Experimental^{[g 25]}	Experimental	No	No	No
	`animation-delay`
	`animation-direction`
	`animation-duration`
	`animation-iteration-count`
	`animation-name`
	`animation-play-state`
	`animation-timing-function`
2D Transforms^{[spec 19]}
CSS3
	`transform`	Experimental^{[t 1]}	Experimental	Experimental	No	Experimental	No
	`transform-origin`	Experimental^{[t 1]}	Experimental	Experimental	No	Experimental	No
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML
3D Transforms^{[spec 20]}
CSS3
	`transform`	No	No^{[g 26]}	Experimental	No	No	No
	`transform-origin`
	`transform-style`
	`perspective`
	`perspective-origin`
	`backface-visibility`
Transitions^{[spec 21]}
CSS3
	`transition-property`	No	Experimental^{[g 27]}	Experimental	No	Experimental	No
	`transition-duration`
	`transition-timing-function`
	`transition-delay`
	`transition`
Flexible Box Layout^{[spec 22]}
CSS3
	`box-align`	Platform Preview	Experimental	Experimental	No	No	No
	`box-direction`
	`box-flex`
	`box-flex-group`
	`box-lines`		No^{[g 28]}
	`box-ordinal-group`		Experimental
	`box-orient`
	`box-pack`
Marquee^{[spec 23]}
CSS3
	`marquee-direction`	No	No	Experimental^{[w 29]}	No	No	No
	`marquee-play-count`
	`marquee-speed`
	`marquee-style`
	`overflow-style`			No
		Trident	Gecko	WebKit	KHTML	Presto	Prince XML

			Trident	Gecko	WebKit	KHTML	Presto	Prince XML
Numbers^{[spec 24]}
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]}	Partial	Partial	Partial	Partial	No
	`<time>`	<number> time-unit	9.0^{[t 1]}	2.0^{[g 27]}	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
Shapes
CSS2	`rect()`	A rectangle	8.0	1.0	85	Yes	1.0	Yes
Functions
CSS2	`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]}	2.0 (Experimental)^{[g 34]}	No^{[w 31]}	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 25]}	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 26]}
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>`		Platform Preview	Experimental	Nightly (Experimental)^{[w 32]}		Experimental
	`<radial-gradient>`
	`linear-gradient()`	Color gradients
	`radial-gradient()`
	`repeating-linear-gradient()`
	`repeating-radial-gradient()`
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	Experimental	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		No	No	No	No
	`ms`	Millisecond		2.0^{[g 35]}	Yes	Yes	2.5
	`s`	Second		2.0^{[g 35]}			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		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	9.0^{[t 1]}	1.9.2	No	No	No
	`vw`	the viewport's width		No^{[g 36]}	No^{[w 33]}	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	Gecko	WebKit	KHTML	Presto	Prince XML

v · d · eWeb browser engines

Actively developed web browser engines	Amaya · Gecko · KHTML · Presto · Prince · Trident · WebKit

Inactive web browser engines	Boxely · Gazelle · GtkHTML · HTMLayout · iCab · Mariner · Tasman · Tkhtml

Comparison of web browser engines	HTML (Non-standard HTML) · HTML5 (Media · Canvas) · XML (XHTML (1.1) · MathML · SVG) · CSS · ECMAScript · DOM · Graphics · Typography

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