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Comparison of layout engines (CSS)

Web Design & Development Guide

Comparison of layout engines (CSS)

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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.

Engine Nomenclature

  • Trident is the layout engine used in Internet Explorer for Windows.
    Tasman is used in Internet Explorer for Macintosh.
    Gecko in all Mozilla software.
    WebCore provides the HTML layout engine for Mac OS X.
    KHTML for KDE.
    Presto for Opera.
    iCab is a browser for the Mac.

Meaning of Values

"Yes" indicates that the current version of the browser 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. "Buggy" indicates that the property is understood, but that it is not implemented correctly in all cases. "Dangerous" indicates that the property is understood, but that deleterious behaviour results. Version numbers, where known, are provided to indicate when support for this feature was added. If support was added in a publicly available unofficial release (such as an alpha or beta version), a red background is used. Proprietary properties are not included.

General overview

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 WebCore KHTML Presto iCab
CSS1 6.0 0 1.0 85 Yes 7.0 Yes
CSS2.1 Partial Partial Mostly Mostly Mostly 9.0 Mostly
CSS3 No No Slight Slight Slight Slight Slight

Grammar and rules

  Trident Tasman Gecko WebCore KHTML Presto iCab
CSS2 important Weight increasing 7.0 0 1.0 85 Yes 7.0 Yes
/*Comment*/ Comments 3.0 0 1.0 85 Yes 7.0 Yes
@import Import stylesheet 4.0 0 1.0 Yes Yes 7.0 Yes
@charset Character set 5.5  ? 1.0 0 No 7.0 Yes
@media Media-specific rules 5.5 0.9 1.0 Yes Yes 7.0 3.0
@page For paged media 5.5 No No No No 7.0 No
CSS3 @namespace Namespace declaration No No 1.0 Yes Yes 8.0 No
@font-face Define font 5.5 No No No No No No

Trident grammar and rule notes

  1. @font-face — Only supports Embedded OpenType (.eot) font format, does not understand the format() identifier.
  2. !important — !important doesn't override rules defined later in the same declaration block prior to IE7.

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, WebCore 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 WebCore KHTML Presto iCab
Element selectors
CSS2 * Universal 7.0 0 1.0 85 Yes 7.0 3.0
E Element 4.0 0 1.0 85 Yes 7.0 Yes
E.class Class 7.0 Buggy 1.0 85 Yes 7.0 Yes
E#id ID 4.0 0 1.0 85 Yes 7.0 Yes
CSS3 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
E > F Child 7.0 0 1.0 85 Yes 7.0 3.0
E + F Direct adjacent 7.0 0 1.0 85 Yes 7.0 3.0
CSS3 E ~ F Indirect adjacent 7.0 0.9 1.7 412 3.3.2 9.0 3.0
Attribute selectors
CSS2 E[attr] Has 7.0 0.9 1.0 85 Yes 7.0 3.0
E[attr="value"] Equals 7.0 0.9 1.0 Yes Yes 7.0 3.0
E[attr~="value"] Contains (space-separated) 7.0 0.9 1.0 Yes Yes 7.0 3.0
E[attr|="value"] Contains (hyphen-separated) 7.0 0.9 1.0 Yes Yes 7.0 3.0
CSS3 E[attr^="value"] Begins with 7.0 No 1.0 Yes 3.4 8.02 3.0
E[attr$="value"] Ends with 7.0 No 1.0 Yes 3.4 9.0 3.0
E[attr*="value"] Contains substring 7.0 No 1.0 Yes 3.4 9.0 3.0
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
E:visited Visited hyperlink 3.0 0 1.0 85 Yes 7.0 Yes
E:active Active Partial 0 1.0 85 Yes 7.0 Yes
E:hover Mouseover 7.0 0.9 1.0 419.3 Yes 7.0 3.0
E:focus Focused No 0 1.0 Yes Yes 7.0 Yes
E:first-child First child 7.0 0 1.0 85 Yes 7.0 3.0
E:lang() Language No 0 1.2 522 3.4 7.5 3.0
CSS3 E:root Root No 0.1 1.0 85 3.4 9.5 No
E:first-of-type First child of type No 0.9 No 522 3.4 9.5 No
E:last-child Last child No 0.9 1.0 Dangerous 3.4 9.5 No
E:last-of-type Last child of type No 0.9 No Dangerous 3.4 9.5 No
E:only-child Only child No 0.9 1.8 Dangerous 3.4 9.5 No
E:only-of-type Only child of type No 0.9 No Dangerous 3.4 9.5 No
E:nth-child Nth child No 0.9 No No 3.4 9.5 No
E:nth-last-child Nth last child No 0.9 No No 3.4 9.5 No
E:nth-of-type Nth child of type No 0.9 No No 3.4 9.5 No
E:nth-last-of-type Nth last child of type No 0.9 No No 3.4 9.5 No
E:target Target No 0.9 1.3 Partial 3.4 9.5 No
E:empty Empty No 0.9 1.8 412 3.4 9.5 No
E:not() Negation No 0.9 1.0 85 3.4 9.5 No
E:enabled Enabled state No 0.9 1.8 522 3.4 9.0 No
E:disabled Disabled state No 0.9 1.8 522 3.4 9.0 No
E:checked Checked state No No 1.0 522 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
E:read-only Read-only No No Experimental No No 9.0 No
E:read-write Read and write No No Experimental No No 9.0 No
Pseudo-elements
CSS2 E:first-letter First letter 5.5 0 1.0 85 Yes 7.0 3.0
E:first-line First line 5.5 0 1.0 85 Yes 7.0 3.0
E:before Before No No 1.0 85 Yes 7.0 3.0
E:after After No No 1.0 85 Yes 7.0 3.0
CSS3 E::before Double colon notation No No 1.5 85 3.4 7.0 Yes
E::after Double colon notation No No 1.5 85 3.4 7.0 Yes
E::first-letter Double colon notation No 0.9 1.5 85 3.4 7.0 Yes
E::first-line Double colon notation No 0.9 1.5 85 3.4 7.0 Yes
E::selection Selection No 0.9 Experimental 412 3.4 No No
E::value Double colon notation No No No No No No No
E::choices Double colon notation No No No No No No No
E::repeat-item Double colon notation No No No No No No No
E::repeat-index Double colon notation No No No No No No No
  Trident Tasman Gecko WebCore KHTML Presto iCab

Trident selector notes

  1. :active — :active is for anchor element only.
  2. :hover — :hover is applied for all elements only in standards-compliant mode, not quirks mode [1]. Prior to 7.0, :hover is for anchor element only.
  3. .one.two — only .two class selector was taken into consideration before 7.0.
  4. * — Prior to 7.0 this was treated as a single or no element.

Tasman selector notes

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

WebCore selector notes

  1. :lang() — Only detected when explicitly present on element being tested, attribute not inherited.
  2. :target — Style doesn't get applied when navigating using back and forward buttons.
  3. :last-child & :last-of-type — will match all siblings, or all siblings of the same type, respectively.
  4. :only-child & :only-of-type — identical behaviour to :first-child & :first-of-type.
  5. ::pseudo-element — Mistakenly also triggers on ::pseudo-class prior to version 416.0.

Properties

  Trident Tasman Gecko WebCore KHTML Presto iCab
Box model
CSS2 margin 4.0 0 1.0 85 Yes 7.0 3.0
padding 4.0 0 1.0 85 Yes 7.0 3.0
width 4.0 0 1.0 85 Yes 7.0 3.0
height 4.0 0 1.0 85 Yes 7.0 3.0
float 5.0 0 1.0 85 Yes 7.0 3.0
clear 5.0 0 1.0 85 Yes 7.0 Yes
display Partial Partial Partial 85 Yes 7.0 Partial
min-width 7.0 0.9 1.0 416 Yes 7.0 3.0
max-width 7.0 0.9 1.0 416 Yes 7.0 3.0
min-height 7.0 0.9 1.7 416 3.3.2 7.0 3.0
max-height 7.0 0.9 1.7 416 3.3.2 7.0 3.0
clip 5.5 0.9 1.0 85 Yes 7.0 3.0
overflow 7.0 0 1.0 85 3.2 7.0 3.0
visibility 4.0 0.9 1.8 522 Partial Partial Partial
CSS3 overflow-x 7.0 No 1.8 522 3.5.6 No No
overflow-y 7.0 No 1.8 522 3.5.6 No No
Borders
CSS2 border 4.0 0 1.0 85 Yes 7.0 3.0
border-color 4.0 0 1.0 85 Yes 7.0 3.0
border-style 7.0 0 1.0 85 Yes 7.0 3.0
border-width 4.0 0 1.0 85 Yes 7.0 3.0
border-top 5.5 0 1.0 85 Yes 7.0 3.0
border-top-width 5.5 0 1.0 85 Yes 7.0 3.0
border-right 5.5 0 1.0 85 Yes 7.0 3.0
border-right-width 5.5 0 1.0 85 Yes 7.0 3.0
border-bottom 5.5 0 1.0 85 Yes 7.0 3.0
border-bottom-width 5.5 0 1.0 85 Yes 7.0 3.0
border-left 5.5 0 1.0 85 Yes 7.0 3.0
border-left-width 5.5 0 1.0 85 Yes 7.0 3.0
border-top-color 4.0 0 1.0 85 Yes 7.0 3.0
border-top-style 5.5 0 1.0 85 Yes 7.0 3.0
border-right-color 4.0 0 1.0 85 Yes 7.0 3.0
border-right-style 5.5 0 1.0 85 Yes 7.0 3.0
border-bottom-color 4.0 0 1.0 85 Yes 7.0 3.0
border-bottom-style 5.5 0 1.0 85 Yes 7.0 3.0
border-left-color 4.0 0 1.0 85 Yes 7.0 3.0
border-left-style 5.5 0 1.0 85 Yes 7.0 3.0
CSS3 border-radius No No Experimental Experimental Experimental No No
border-break No No No No No No No
border-image No No No Experimental No No No
box-shadow No No No Experimental No No No
Line Layout
CSS2 line-height 4.0 0 1.0 85 Yes 7.0 Yes
vertical-align 5.5 0 1.0 85 Yes 7.0 3.0
Positioning
CSS2 position 7.0 0 1.0 85 Yes 7.0 3.0
top Partial Partial 1.0 85 Yes 7.0 3.0
right Partial Partial 1.0 85 Yes 7.0 3.0
bottom Partial Partial 1.0 85 Yes 7.0 3.0
left Partial Partial 1.0 85 Yes 7.0 3.0
z-index Partial Partial 1.0 85 Yes 7.0 3.0
Generated and Replaced Content
CSS2 quotes No 0.9 1.8 No 3.4 7.0 3.0
content No No Partial 85 Yes 7.0 3.0
counter-increment No No 1.8 522 3.4 7.0 3.0
counter-reset No No 1.8 522 3.4 7.0 3.0
Lists
CSS2 list-style 4.0 0 1.0 85 Yes 7.0 3.0
list-style-image 4.0 0 1.0 85 Yes 7.0 3.0
list-style-position 4.0 0 1.0 85 Yes 7.0 3.0
list-style-type Partial 0 1.0 85 3.4 8.0 3.0
Colors
CSS2 color 3.0 0 1.0 85 Yes 7.0 Yes
CSS3 color-profile No No No No No No No
opacity nonstandard No 1.7 125 Experimental 9.0 No
rendering-indent No No No No No No No
Backgrounds
CSS2 background 4.0 0 1.0 85 Yes 7.0 Yes
background-attachment 7.0 0 1.0 85 Yes 7.0 Yes
background-color 4.0 0 1.0 85 Yes 7.0 3.0
background-image 4.0 0 1.0 85 Yes 7.0 Yes
background-position Partial 0 1.0 85 Yes 7.0 Yes
background-repeat 4.0 0 1.0 85 Yes 7.0 Yes
CSS3 background (multiple) No No No 312 3.5 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
background-size No No No Experimental Experimental No No
Fonts
CSS2 font 4.0 0 1.0 85 Yes 7.0 Yes
font-family 4.0 0 1.0 85 Yes 7.0 Yes
font-size 3.0 0 1.0 85 Yes 7.0 Yes
font-style 4.0 0 1.0 85 Yes 7.0 Yes
font-variant 4.0 0 1.0 125 Yes 7.0 3.0
font-weight Buggy 0 Partial Partial Yes Buggy Buggy
CSS3 font-size-adjust No No Partial No No No No
font-stretch No No No No No No Buggy
font-effect No No No No No No No
font-smooth No No No No No No No
font-emphasize No No No No No No No
Text
CSS2 text-align 4.0 0 1.0 85 Yes 7.0 Partial
text-decoration 4.0 0 1.0 85 Yes 7.0 3.0
text-indent 3.0 0 1.0 85 Yes 7.0 Yes
text-transform 4.0 0 1.0 85 Yes 7.0 Yes
letter-spacing 4.0 0 1.0 85 Yes 7.0 Yes
word-spacing Partial Partial 1.0 85 Yes 7.0 Yes
white-space Partial Partial Partial 85 Yes Partial Yes
direction 5.0 0 1.0 85 Yes 7.2 No
unicode-bidi 5.0 0 1.0 522 Yes 7.2 No
CSS3 text-shadow No No No Partial 3.4 9.5 3.0.3
word-break Partial No No No No No No
text-wrap No No No No No No No
word-wrap 5.0 No No 85 No No No
text-align-last Partial No No No No No No
text-justify 5.5 No No No No No No
punctuation-trim No No No No No No No
text-enphasis No No No No No No No
text-outline No No No No No No No
hanging-punctuation No No No No No No No
Tables
CSS2 border-collapse Partial 0.9 1.0 125 Yes 7.0 3.0
border-spacing No 0.9 1.0 125 Yes 7.0 3.0
caption-side No 0.9 1.4 85 Yes 7.0 CSS2.1
empty-cells Partial 0.9 1.0 125 Yes 7.0 Buggy
table-layout 5.0 0 1.0 85 Yes 7.0 3.0
User interface
CSS2 cursor 5.5 0 1.8 125 Yes 7.0 3.0
outline No 0 1.8 125 Yes 7.0 3.0
outline-color No 0 1.8 125 Yes 7.0 3.0
outline-style No 0 1.8 125 Yes 7.0 3.0
outline-width No 0 1.8 125 Yes 7.0 3.0
CSS3 outline-offset No No 1.8 125 No No No
outline-radius No No Experimental No No No No
box-sizing No 0 Experimental 522 3.3.2 7.0 No
resize No No No 522 No No No
appearance No No Experimental Experimental No No No
icon No No No No No No No
nav-index No No No No No 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
Paged media
CSS2 marks No No No No No 7.0 No
orphans No No No 312 3.5 7.0 No
page-break-after 4.0 No Partial Partial 3.5 7.0 No
page-break-before 4.0 0 Partial Partial 3.5 7.0 No
page-break-inside No No No 312 3.5 7.0 No
widows No No No 312 3.5 7.0 No
CSS3 page No No No No No No No
size No No No No No 7.0 No
image-orientation No No No No No No No
fit No No No No No No No
fit-position No No No No No No No
Speech
CSS3 voice-volume No No No No No 7.6 No
voice-balance 7.6
speak 7.6
pause 7.6
pause-after 7.6
pause-before 7.6
rest No
rest-before No
rest-after No
cue 7.6
cue-after 7.6
cue-before 7.6
mark No
mark-before No
mark-after No
voice-family 7.6
voice-rate 7.6
voice-pitch 7.6
voice-pitch-range 7.6
voice-stress 7.6
voice-duration 7.6
phonemes 7.6
Media Queries
CSS3 width No No No 522 No 9.0 No
height 522 9.0
device-width 522 9.0
device-height 522 9.0
device-aspect-ratio 522 9.0
color 522 9.0
color-index 522 9.0
monochrome 522 9.0
resolution No 9.0
scan No No
grid No 9.0
Ruby characters
CSS3 ruby-position 5.0 0 No No No No No
ruby-align 5.0 0
ruby-overhang 5.0 0
ruby-span No No
Multi-column Layout
CSS3 column-break-before No No Experimental Experimental No No No
column-break-after Experimental Experimental
column-break-inside Experimental Experimental
column-count Experimental Experimental
column-gap Experimental Experimental
column-rule No No
columns Experimental Experimental

Trident property notes

  1. overflow — overflow:visible is incorrectly supported prior to IE7.
  2. border-style — dotted is rendered as dashed prior to IE7.
  3. display — Only none, block, inline, table-header-group, and table-footer-group are supported prior to 7.0. In 5.5+, inline-block is supported on elements that are naturally inline.
  4. position — Prior to IE 7, fixed positioning was not supported, IE 7 supports it in standards-compliant mode only.
  5. background-attachment — Prior to IE 7, fixed was allowed on the body element only.
  6. background-position — Fixed positioning is not supported.
  7. font-weight — Incorrect rendering when value is 600 [2].
  8. text-decoration — Optional property blink is not supported.
  9. white-space — nowrap is supported in IE 5.5 and later. pre is supported in IE 6 and later in standards-compliant mode. pre-line and pre-wrap are not supported.
  10. list-style-type — decimal-leading-zero, lower-greek, lower-latin, upper-latin, upper-roman are not supported.

Gecko property notes

  1. display — run-in [3] is not supported. inline-table [4] and inline-block [5] are supported in Gecko 1.9a2+.
  2. quotes — Does not support nested quotes prior to 1.8 [6].
  3. content — Only works with :before and :after. Only support image <uri>. <counter> does not work prior to 1.8 [7].
  4. background-position — Gecko versions prior to 1.7 implement the CSS2 syntax, not the proposed CSS2.1 expanded syntax.
  5. font-size-adjust — Supported in Windows only[8]. This problem will be fixed in the future Gecko 1.9.
  6. font-weight — Only Regular and Bold weights get used, even if Light or Heavy/Black faces are installed.
  7. white-space — pre-line is not supported. pre-wrap is only supported experimentally as -moz-pre-wrap;.
  8. visibility — collapse is not supported prior to 1.8.
  9. border-radius — border curves are circular, but the W3C specs [9] define them as elliptical. Dashed curves are not available. Short-cut definitions for border-radius read "tl tr br bl" instead of the W3C's "tr br bl tl". Interesting bugs: [10] [11] [12]
  10. page-break-before; page-break-after — Only the always and auto values are supported.

WebCore property notes

  1. box-shadow — The system font keywords are not supported that allow designers to tailor presentation to the user’s operating system environment.
  2. font — The system font keywords are not supported that allow designers to tailor presentation to the user’s operating system environment.
  3. font-weight — Only Regular and Bold weights get used, even if Light or Heavy/Black faces are installed.
  4. page-break-before; page-break-after — Only the always and auto values are supported.
  5. text-decoration — Optional property blink is not supported.
  6. white-space — pre-line and pre-wrap from the proposed CSS2.1 draft are not supported.
  7. text-shadow — Multiple shadows are not supported.
  8. visibility — collapse is not supported prior to 522.

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 supported except for collapse.

Presto property notes

  1. list-style-type — The CSS2 values are not supported prior to 8.0.
  2. counter-increment, counter-reset — Implemented the algorithm in REC CSS2.
  3. background-position — Presto versions prior to 8.0 implement the CSS2 syntax, not the proposed CSS2.1 expanded syntax.
  4. font-weight — Incorrect rendering when value is 600 [13].
  5. white-space — pre-line is not supported.
  6. visibility — All supported except for collapse.

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 WebCore KHTML Presto iCab
Numbers CSS2 <number> A floating-point number 3.0 0 1.0 85 Yes 7.0 Yes
<length> <number> followed by units 3.0 0 1.0 85 Yes 7.0 Yes
<percentage> <number> followed by % 3.0 0 1.0 Imprecise Yes 7.0 Yes
<integer> An integer 3.0 0 1.0 85 Yes 7.0 Yes
CSS3 <angle> <number> angle-unit No No No Yes Yes No No
<time> <number> time-unit Yes Yes
<frequency> <number> frequency-unit Yes Yes
Strings CSS2 <string> String 3.0 0 1.0 85 Yes 7.0 Yes
\code Unicode escapes 6.0 0.9 1.0 85 Yes 7.0 Yes
Shapes CSS2 rect() A rectangle 5.5 0 1.0 85 Yes 7.0 Yes
Functions CSS2 url() Uniform Resource Identifier 3.0 0 1.0 85 Yes 7.0 Yes
CSS2 counter()   No No ? ? ? ? ?
CSS3 attr() Attribute identifier No No 1.0 Yes Yes 7.0 Yes
calc()   No No ? ? ? ? ?
Colors CSS2 color names 16 predefined web colors 3.0 0 1.0 85 Yes 7.0 Yes
#rrggbb or #rgb Hexadecimal notation 3.0 0 1.0 85 Yes 7.0 Yes
rgb(r,g,b) RGB notation 4.0 0 1.0 85 Yes 7.0 Yes
system colors 28 predefined system colors [14] 3.0 0 1.0 85 Yes 7.0 Yes
transparent Full transparency 4.0 0 1.0 85 Yes 7.0 Yes
CSS3 rgba(r,g,b,a) RGBA notation No No 1.9 522 Buggy No No
hsl(h,s,l) HSL notation No No Yes 522 3.5.5 No No
hsla(h,s,l,a) HSLA notation No No 1.9 522 3.5.5 No No
Keywords CSS2 auto Automatically calculated 6.0 0 1.0 85 Yes 7.0 Yes
inherit Inherited from the parents No  ? 1.0 85 Yes 7.0 Yes
CSS3 initial   No No Experimental No No No No
Units CSS2 px Pixel 3.0 0 1.0 85 Yes 7.0 Yes
pt Point 3.0 0 1.0 85 Yes 7.0 Yes
pc Pica 3.0 0 1.0 85 Yes 7.0 Yes
cm Centimetre 3.0 0 1.0 85 Yes 7.0 Yes
mm Millimetre 3.0 0 1.0 85 Yes 7.0 Yes
in inch 3.0 0 1.0 85 Yes 7.0 Yes
em em 3.0 0 1.0 85 Yes 7.0 Yes
ex ex 3.0 0 1.0 85 Yes 7.0 Yes
% Percentage 3.0 0 1.0 85 Yes 7.0 Yes
CSS3 deg Degree No No No Yes Yes No No
grad Grad Yes Yes
rad Radian Yes Yes
ms Millisecond Yes Yes
s Second Yes Yes
Hz Hertz Yes Yes
kHz Kilohertz Yes Yes
turn Turn No No
gd gd No No
rem rem No No
vw vw No No
vh vh No No
vm vm No No
ch ch No No

Trident value and unit notes

  1. auto — In IE5 bug emulation mode (quirks mode) does not work for margins, except table elements.

WebCore value and unit notes

  1. <percentage> — Only uses the integer component of <number>.

Presto value and unit notes

  1. attr() — As all URI attribute values are resolved to full URI, the value could be wrong if attr() is used on an attribute that contains relative URI.
  2. <number> — Quantization error for values greater than 20.47 [15] (not limited to em, try any non pixel units).

KHTML value and unit notes

  1. rgba() — Because opacity is not supported, the opacity value of rgba() is ignored.

General notes

Gecko general notes

  1. -moz- — All experimental selectors, properties and values are prefixed with "-moz-", e.g. ::-moz-selection instead of ::selection [16].

WebCore 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.

References

External links

CSS Compatibility Tables

  • WebDevout — mostly covers Windows browsers. Extensive bug testing.
  • QuirksMode — comprehensive but lacks latest versions.
  • Westciv — abridged form of their retail guide.
  • MacEdition — covers many Mac browsers, including rare and discontinued ones.
  • Jesset — simple table without bug details, includes WebTV.
  • Motohiko — covers Firefox only. [Japanese]

Other links


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