Comparison of layout engines (Cascading Style Sheets)
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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.
Contents
1 Explanation of the tables
2 CSS version support 3 Grammar and rules
3.1 Trident grammar and rule notes 3.2 Tasman grammar and rule notes 3.3 Presto grammar and rule notes
4 Selectors
4.1 Trident selector notes 4.2 Tasman selector notes 4.3 Gecko selector notes 4.4 WebKit selector notes
5 Properties
5.1 Trident property notes 5.2 Gecko property notes 5.3 WebKit property notes 5.4 KHTML property notes 5.5 Presto property notes 5.6 iCab property notes
6 Values and units
6.1 General value and unit notes 6.2 Trident value and unit notes 6.3 Gecko value and unit notes 6.4 WebKit value and unit notes 6.5 KHTML value and unit notes 6.6 Presto value and unit notes
7 General notes
8 References 9 External links[edit] Explanation of the tables
[edit] 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 (also known as MSHTML) Internet Explorer 4 to Internet Explorer 8
WebKit Safari; Shiira; iCab 4; Epiphany; Adobe Air; Google Chrome; Midori; OmniWeb; Adobe Dreamweaver CS4;
Presto Opera; Nintendo DS Browser; Internet Channel; future Adobe Systems products
[edit] 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 when valid values are used.
No Indicates that this property is completely ignored.
Partial Indicates that the property is understood, but that not all values are supported. Supported values are implemented correctly.
Incorrect Indicates that the property is understood, but that it is not implemented correctly in all cases.
Experimental Indicates that the property is provided in experimental form under an alternative name, generally with only partial functionality.
[edit] CSS version support
Please improve the article, or discuss the issue on the talk page.
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.
CSS1 6.0 0 1.0 85 Yes 7.0 Yes 1.0
CSS2.1 Mostly Partial Mostly Mostly Mostly Mostly Mostly Mostly
CSS3 Slight Slight Slight Slight Slight Partial Slight Partial
[edit] Grammar and rules
/*Comment*/ Comments 3.0 0 1.0 85 Yes 7.0 Yes Yes
@charset Character set 5.5 ? 1.0 0 No 7.0 Yes Yes
@media Media-specific rules 5.5 0.9 1.0 Yes Yes 7.0 3.0 5.1
CSS3 @namespace Namespace declaration No No 1.0 Yes Yes 8.0 No 5.0
[edit] Trident grammar and rule notes
!important — !important doesn't override rules defined later in the same declaration block prior to IE7. @import — Media type support is broken in all versions including IE7. For @import exampleurl examplemedia; IE requests the url exampleurl%20examplemedia and will include url() and/or quotes in the url, too, if present in the @import rule. @font-face — Only supports Embedded OpenType (.eot) font format, does not understand the format() identifier.
[edit] Tasman grammar and rule notes
@font-face — Versions 5.16 and 5.17 will download fonts specified but not use them. 5.23 no longer downloads the font.
[edit] Presto grammar and rule notes
@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.
[edit] Selectors
Element selectors
E Element 4.0 0 1.0 85 Yes 7.0 Yes Yes
E#id ID 4.0 0 1.0 85 Yes 7.0 Yes Yes
CSS3 ns|E Namespaced No No 1.0 No Yes 8.0 No ?
Relationship selectors
CSS2 E F Descendant 4.0 0 1.0 85 Yes 7.0 Yes Yes
E > F Child 7.0 0 1.0 85 Yes 7.0 3.0 Yes
E + F Direct adjacent 7.0 0 1.0 85 Yes 7.0 3.0 Yes
CSS3 E ~ F Indirect adjacent 7.0 0.9 1.7 412 3.3.2 9.0 3.0 Yes
Attribute selectors
CSS2 E[attr] Has 7.0 0.9 1.0 85 Yes 7.0 3.0 Yes
E[attr="value"] Equals 7.0 0.9 1.0 Yes Yes 7.0 3.0 Yes
E[attr~="value"] Contains (space-separated) 7.0 0.9 1.0 Yes Yes 7.0 3.0 Yes
E[attr|="value"] Contains (hyphen-separated) 7.0 0.9 1.0 Yes Yes 7.0 3.0 Yes
CSS3 E[attr^="value"] Begins with 7.0 No 1.0 Yes 3.4 8.02 3.0 Yes
E[attr$="value"] Ends with 7.0 No 1.0 Yes 3.4 9.0 3.0 Yes
E[attr*="value"] Contains substring 7.0 No 1.0 Yes 3.4 9.0 3.0 Yes
E[ns|attr] Namespaced No No 1.0 No 3.4 9.0 No ?
Pseudo-classes
CSS2 E:link Unvisited hyperlink 3.0 0 1.0 85 Yes 7.0 Yes 6.0
E:visited Visited hyperlink 3.0 0 1.0 85 Yes 7.0 Yes Yes
E:focus Focused 8.0 0 1.0 Yes Yes 7.0 Yes Yes
E:first-child First child 7.0 0 1.0 85 Yes 7.0 3.0 Yes
CSS3 E:root Root No 0.1 1.0 85 3.4 9.5 No Yes
E:last-child Last child No 0.9 1.0 525 3.4 9.5 No Yes
E:only-child Only child No 0.9 1.8 525 3.4 9.5 No Yes
E:empty Empty No 0.9 1.8 412 3.4 9.5 No Yes
E:not() Negation No 0.9 1.0 85 3.4 9.5 No Yes
E:enabled Enabled state No 0.9 1.8 525 3.4 9.0 No ?
E:disabled Disabled state No 0.9 1.8 525 3.4 9.0 No ?
E:checked Checked state No No 1.0 525 3.4 9.0 No ?
E:indeterminate Indeterminate state No 0.9 No No No No No ?
E:default Default No No 1.9 No No 9.0 No ?
E:valid Valid No No 1.8 No No 9.0 No ?
E:invalid Invalid No No 1.8 No No 9.0 No ?
E:in-range In range No No 1.8 No No 9.0 No ?
E:out-of-range Out of range No No 1.8 No No 9.0 No ?
E:required Required No No No No No 9.0 No ?
E:optional Optional No No No No No 9.0 No ?
Pseudo-elements
E:before Before 8.0 No 1.0 85 Yes 7.0 3.0 Yes
E:after After 8.0 No 1.0 85 Yes 7.0 3.0 Yes
E::value Double colon notation No No No No No No No No
E::choices Double colon notation No No No No No No No No
E::repeat-item Double colon notation No No No No No No No No
E::repeat-index Double colon notation No No No No No No No No
[edit] Trident selector notes
:active —
:active is for anchor element only. :hover — :hover is applied for all elements only in standards-compliant mode, not quirks mode [2]. Prior to 7.0, :hover is for anchor element only. .one.two — only .two class selector was taken into consideration before 7.0. * — Prior to 7.0 this was treated as a single or no element. :first-letter — float and vertical-align properties not allowed. :first-line — can't be attached to a inline-block element and background property doesn't work when pseudo-element is attached to a layout element.[edit] Tasman selector notes
:hover — For anchor element only prior to 0.9. .one.two — only
.two class selector is taken into consideration.[edit] Gecko selector notes
:*-of-type — See Bug 128585 on Bugzilla
:nth-* — See Bug 75375 on Bugzilla
[edit] WebKit selector notes
:lang() — Only detected when explicitly present on element being tested, attribute not inherited. :target — Style doesn't get applied when navigating using back and forward buttons. ::pseudo-element — Mistakenly also triggers on
::pseudo-class prior to version 416.0.[edit] Properties
Box model
CSS2 margin 4.0 0 1.0 85 Yes 7.0 3.0 Yes
padding 4.0 0 1.0 85 Yes 7.0 3.0 Yes
width 4.0 0 1.0 85 Yes 7.0 3.0 Yes
height 4.0 0 1.0 85 Yes 7.0 3.0 Yes
float 5.0 0 1.0 85 Yes 7.0 3.0 Yes
clear 5.0 0 1.0 85 Yes 7.0 Yes Yes
min-width 7.0 0.9 1.0 416 Yes 7.0 3.0 5.0
max-width 7.0 0.9 1.0 416 Yes 7.0 3.0 5.0
min-height 7.0 0.9 1.7 416 3.3.2 7.0 3.0 5.0
max-height 7.0 0.9 1.7 416 3.3.2 7.0 3.0 5.0
Borders
CSS2 border 4.0 0 1.0 85 Yes 7.0 3.0 3.0
border-width 4.0 0 1.0 85 Yes 7.0 3.0 3.0
border-top 5.5 0 1.0 85 Yes 7.0 3.0 3.0
border-top-width 5.5 0 1.0 85 Yes 7.0 3.0 3.0
border-right 5.5 0 1.0 85 Yes 7.0 3.0 3.0
border-right-width 5.5 0 1.0 85 Yes 7.0 3.0 3.0
border-bottom 5.5 0 1.0 85 Yes 7.0 3.0 3.0
border-bottom-width 5.5 0 1.0 85 Yes 7.0 3.0 3.0
border-left 5.5 0 1.0 85 Yes 7.0 3.0 3.0
border-left-width 5.5 0 1.0 85 Yes 7.0 3.0 3.0
border-top-color 4.0 0 1.0 85 Yes 7.0 3.0 3.0
border-top-style 5.5 0 1.0 85 Yes 7.0 3.0 3.0
border-right-color 4.0 0 1.0 85 Yes 7.0 3.0 3.0
border-right-style 5.5 0 1.0 85 Yes 7.0 3.0 3.0
border-bottom-color 4.0 0 1.0 85 Yes 7.0 3.0 3.0
border-bottom-style 5.5 0 1.0 85 Yes 7.0 3.0 3.0
border-left-color 4.0 0 1.0 85 Yes 7.0 3.0 3.0
border-left-style 5.5 0 1.0 85 Yes 7.0 3.0 3.0
border-break No No No No No No No ?
Line Layout
CSS2 line-height 4.0 0 1.0 85 Yes 7.0 Yes 5.0
vertical-align 5.5 0 1.0 85 Yes 7.0 3.0 6.0
Positioning
top Partial Partial 1.0 85 Yes 7.0 3.0 6.0
right Partial Partial 1.0 85 Yes 7.0 3.0 6.0
bottom Partial Partial 1.0 85 Yes 7.0 3.0 6.0
left Partial Partial 1.0 85 Yes 7.0 3.0 6.0
z-index Partial Partial 1.0 85 Yes 7.0 3.0 6.0
Generated and Replaced Content
Lists
CSS2 list-style 4.0 0 1.0 85 Yes 7.0 3.0 6.0
list-style-image 4.0 0 1.0 85 Yes 7.0 3.0 6.0
list-style-position 4.0 0 1.0 85 Yes 7.0 3.0 6.0
Colors
CSS2 color 3.0 0 1.0 85 Yes 7.0 Yes 5.0
Backgrounds
CSS2 background 4.0 0 1.0 85 Yes 7.0 Yes 6.0
background-color 4.0 0 1.0 85 Yes 7.0 3.0 3.1
background-image 4.0 0 1.0 85 Yes 7.0 Yes 6.0
background-repeat 4.0 0 1.0 85 Yes 7.0 Yes 3.1
CSS3 background (multiple) No No No 312 3.5 No No No
background-break No No No No No No No No
Fonts
CSS2 font 4.0 0 1.0 85 Yes 7.0 Yes Yes
font-family 4.0 0 1.0 85 Yes 7.0 Yes Yes
font-size 3.0 0 1.0 85 Yes 7.0 Yes 3.1
font-style 4.0 0 1.0 85 Yes 7.0 Yes Yes
font-variant 4.0 0 1.0 125 Yes 7.0 3.0 Yes
font-stretch No No No No No No Incorrect No
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
Text
text-indent 3.0 0 1.0 85 Yes 7.0 Yes Yes
text-transform 4.0 0 1.0 85 Yes 7.0 Yes 6.0
letter-spacing 4.0 0 1.0 85 Yes 7.0 Yes 5.
direction 5.0 0 1.0 85 Yes 7.2 No No
unicode-bidi 5.0 0 1.0 525 Yes 7.2 No No
text-overflow Partial No No Partial No Experimental No No
word-break Partial No No No No No No No
text-wrap No No No No No 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 Partial 0.9 1.0 125 Yes 7.0 3.0 5.1
border-spacing No 0.9 1.0 125 Yes 7.0 3.0 6.0
table-layout 5.0 0 1.0 85 Yes 7.0 3.0 6.0
User interface
outline 8.0 0 1.8 125 Yes 7.0 3.0 No
outline-color 8.0 0 1.8 125 Yes 7.0 3.0 No
outline-style 8.0 0 1.8 125 Yes 7.0 3.0 No
outline-width 8.0 0 1.8 125 Yes 7.0 3.0 No
CSS3 outline-offset No No 1.8 125 No 9.5 No No
resize No No No 525 No No No No
icon No No No No No No No No
nav-index No No No No No 9.5 No No
nav-up No No No No No 9.5 No No
nav-right No No No No No 9.5 No No
nav-down No No No No No 9.5 No No
nav-left No No No No No 9.5 No No
Paged media
CSS2 orphans No No No 312 3.5