Comparison of layout engines (Cascading Style Sheets)

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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

[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 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


[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/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.


[edit] CSS version support

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 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

[edit] Grammar and rules

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

[edit] Trident grammar and rule notes

  1. !important — Prior to 7.0, !important doesn't override rules defined later in the same declaration block.
  2. @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.

[edit] 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.

[edit] Selectors

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
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 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
E:in-range In range Yes[w 5]
E:out-of-range Out of range
E:required Required 2.0[g 2] Yes[w 6]
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 9.0 1.0 85 Yes 1.0 5.0
E:first-line First line Partial No[r 1]
E:before Before 8.0 1.9.1 Partial Yes
E:after After
CSS3 E::before Double colon notation 9.0 1.9.1 Partial 3.4 1.0 Yes
E::after Double colon notation
E::first-letter Double colon notation 1.5 85
E::first-line Double colon notation Partial No[r 1]
E::selection Selection Experimental 412 2.1 No
Trident Gecko WebKit KHTML Presto Prince XML

[edit] General selector notes

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

[edit] Trident selector notes

  1. :active — Prior to 8.0, :active is only supported on anchor elements.
  2. :hover — Prior to 7.0, :hover is only supported on anchor elements.
  3. .one.two — Prior to 7.0, only .two class selector was taken into consideration.
  4. * — Prior to 7.0 this was treated as a single or no element.
  5. [attr] — Matches every td and th in a table when the attribute is colspan (regardless of whether any actually have a colspan attribute).[t 2] This may not actually be a bug, as ambiguity exists in the specification.[t 3]
  6. :first-letter, :first-line — Prior to IE9 in 6.0, combining :first-letter rules with others may be problematic.[t 4] In 8.0, rules with !important are ignored inside :first-line and :first-letter declarations.[t 5]

[edit] Gecko selector notes

  1. (:):before, (:):after — CSS2.0 behavior : some properties are unimplemented prior to 1.9.1.[g 3]

[edit] 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.[w 7]
  3. (:):before/after — some styles can't be applied to :before and :after pseudo-elements, such as animations and transitions.[w 8]

[edit] Presto selector notes

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

[edit] Properties

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
overflow-y
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
vertical-align 8.0 1.0 85 Yes 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 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
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
unicode-bidi 5.0 1.0 525 Yes 7.0
CSS3 writing-mode 6.0[t 7] No[g 15] Nightly Build[w 20] No No No
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 6.0
page-break-inside 8.0 No[g 18] 312 6.0
orphans No[g 19] 6.0
widows 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 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 2.1
grid No 4.1 2.5
scan
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
break-inside No[w 26]
column-fill Platform Preview No
column-span 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
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

[edit] General property notes

  1. text-decoration — underline is drawn across inline replaced elements (e.g. images) in Gecko or Webkit.

[edit] Trident property notes

  1. margin — inherit inherits the computation and recomputes it instead of inheriting the computed value.[t 8]
  2. display — Prior to 7.0, only none, block, inline, table-header-group, and table-footer-group are fully supported. Prior to 8.0, run-in and table are not supported, while inline-block is only supported on elements that are naturally inline.
  3. 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 9] This has been fixed in IE9.
  4. 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 10]
  5. content — In 8.0, computed attr() values are not updated when the attribute changes.[t 11]
  6. border-color — Prior to 7.0, transparent is not supported.
  7. border-style — Prior to 8.0, hidden is not supported.
  8. border-style — Prior to 7.0, dotted is rendered as dashed.
  9. box-shadow — Prior to 9.0, trident supports similar functionality since 5.5 using the proprietary Shadow[t 12] and DropShadow[t 13] filters.
  10. position — Prior to 7.0, fixed positioning was not supported. 7.0 and later support it in standards-compliant mode only.
  11. z-index — Prior to 8.0, z-index is only partially supported.[t 14] In 8.0, floating point values are accepted in addition to integers.[t 15]
  12. list-style-type — Prior to 8.0, armenian, decimal-leading-zero, georgian, lower-greek, lower-latin, upper-latin are not supported.
  13. opacity — Prior to 9.0, Trident supported a proprietary alternative.[t 16]
  14. background-image — Prior to 8.0, background images are badly positioned in some cases.[t 17][t 18]
  15. background-attachment — Prior to 7.0, fixed was allowed on the body element only.
  16. background-position — Prior to 8.0, fixed positioning is not supported.
  17. font-weight — Prior to 8.0, incorrect rendering when value is 600.[t 19]
  18. text-align — In 8.0, text-align isn't inherited by :before and :after pseudo-elements.[t 20]
  19. 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 21]
  20. cursor — Does not fail on non-prefixed vendor extensions.

[edit] Gecko property notes

  1. display — run-in is unsupported.[g 29] Prior to 1.9, inline-table[g 30] and inline-block[g 31] were unsupported.
  2. z-index — Negatives values are badly supported prior to 1.9.
  3. quotes — Does not support nested quotes prior to 1.8.[g 32]
  4. 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.
  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, unless using DirectWrite in Gecko 2.0 on Windows 7 or Windows Vista.
  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.[g 33]
  11. page-break-before; page-break-after — Only the always and auto values are supported.

[edit] 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. white-space — Prior to 522, pre-line and pre-wrap are unsupported.
  5. visibility — collapse is unsupported prior to 522. Its implementation has the same effect as hidden and is therefore not compliant.[w 30]
  6. content — The none, open-quote, close-quote, no-open-quote, no-close-quote and normal values is 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.
  7. font-size — The font-size property does not always accept the value 0, in "font-size: 0px" the text is still visible.

[edit] 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. visibility — All properties are supported, but the implementation of collapse has the same effect as hidden and is therefore not compliant.

[edit] 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 — 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.
  5. cursor — cursor is ignored with dynamic pseudo-classes and custom cursors are unsupported.
  6. content — Prior to 2.7, the none value was unsupported.[p 5]
  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.

[edit] Prince XML property notes

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

[edit] Values and units

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 2.0[g 27] Yes Yes 2.5
<frequency> <number> frequency-unit No No No
<fraction> Remaining space No No
Strings
CSS2 <string> String 3.0 1.0 85 Yes 1.0 Yes
\code Unicode escapes 6.0
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
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
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
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
<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
inherit Inherited from the parent 8.0
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
Hz Hertz No No No
kHz Kilohertz
dpi Dots per inch 1.9.1 No 4.1 2.5
dpcm Dots per centimetre
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

[edit] 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.

[edit] 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 — In 7.0 and 8.0, 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.

[edit] Gecko value and unit notes

  1. <ch> — Prior to version 1.9.1, used the width of the "M" glyph instead of the width of the "0" glyph.[g 37]

[edit] 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).[p 6]
  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.

[edit] General notes

[edit] Trident general notes

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

[edit] Gecko general notes

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

[edit] WebKit general notes

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

[edit] KHTML general notes

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

[edit] 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.

[edit] 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 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.

[edit] References

[edit] Specifications

  1. ^ Selectors Level 3, W3C, http://www.w3.org/TR/css3-selectors/ 
  2. ^ CSS basic box model, W3C, http://www.w3.org/TR/css3-box/ 
  3. ^ a b CSS Backgrounds and Borders Module Level 3, W3C, http://www.w3.org/TR/css3-background/ 
  4. ^ CSS3 module: line, W3C, http://www.w3.org/TR/css3-linebox/ 
  5. ^ CSS3 Generated and Replaced Content Module, W3C, http://www.w3.org/TR/css3-content/ 
  6. ^ CSS3 module: Lists, W3C, http://www.w3.org/TR/css3-lists/ 
  7. ^ CSS Color Module Level 3, W3C, http://www.w3.org/TR/css3-color/ 
  8. ^ CSS Fonts Module Level 3, W3C, http://www.w3.org/TR/css3-fonts/ 
  9. ^ CSS Text Level 3, W3C, http://www.w3.org/TR/css3-text/ 
  10. ^ CSS Writing Modes Module Level 3, W3C, http://www.w3.org/TR/css3-writing-modes/ 
  11. ^ CSS3 Basic User Interface Module, W3C, http://www.w3.org/TR/css3-ui/ 
  12. ^ CSS3 Module: Paged Media, W3C, http://www.w3.org/TR/css3-page/ 
  13. ^ CSS3 Speech Module, W3C, http://www.w3.org/TR/css3-speech/ 
  14. ^ Media Queries, W3C, http://www.w3.org/TR/css3-mediaqueries/ 
  15. ^ CSS3 Ruby Module, W3C, http://www.w3.org/TR/css3-ruby/ 
  16. ^ CSS Multi-column Layout Module, W3C, http://www.w3.org/TR/css3-multicol/ 
  17. ^ Grid Layout, W3C, http://www.w3.org/TR/css3-grid-layout/ 
  18. ^ CSS Animations Module Level 3, W3C, http://www.w3.org/TR/css3-animations/ 
  19. ^ CSS 2D Transforms Module Level 3, W3C, http://www.w3.org/TR/css3-2d-transforms/ 
  20. ^ CSS 3D Transforms Module Level 3, W3C, http://www.w3.org/TR/css3-3d-transforms/ 
  21. ^ CSS Transitions Module Level 3, W3C, http://www.w3.org/TR/css3-transitions/ 
  22. ^ Flexible Box Layout Module, W3C, http://www.w3.org/TR/css3-flexbox/ 
  23. ^ CSS Marquee Module Level 3, W3C, http://www.w3.org/TR/css3-marquee/ 
  24. ^ CSS3 Values and Units, W3C, http://www.w3.org/TR/css3-values/ 
  25. ^ System Colors, W3C, http://www.w3.org/TR/CSS21/ui.html#system-colors 
  26. ^ CSS Image Values Module Level 3, W3C, http://dev.w3.org/csswg/css3-images/ 

[edit] Trident references

  1. ^ a b c d e f g h i j k l m n Internet Explorer Platform Preview Guide for Developers, Microsoft, http://msdn.microsoft.com/en-us/ie/ff468705.aspx 
  2. ^ Hopkins, James, Attribute selector (which matches the attribute, 'colspan' for TD and TH elements) matches every TD and TH element, https://connect.microsoft.com/IE/feedback/ViewFeedback.aspx?FeedbackID=446817 
  3. ^ Hammond, David, Comment on "IE 8 CSS 2.1 support results", http://www.webdevout.net/tidings/2009/03/23/ie-8-css-21-support-results/#comment-4168 
  4. ^ :first-letter Ignore Bug, hasLayout.net, http://haslayout.net/css/-first-letter-Ignore-Bug 
  5. ^ Hopkins, James, Declaration which includes !important keyword is ignored when used within a :first-letter or :first-line rule, https://connect.microsoft.com/IE/feedback/details/478138/declaration-which-includes-important-keyword-is-ignored-when-used-within-a-first-letter-or-first-line-rule 
  6. ^ content property doesn't return the value of an attribute when attribute is dynamically, http://idreamincode.co.uk/wp-content/uploads/2008/IE8Bugs/final-release/contentdynamic.html 
  7. ^ CSS 3 Text: A Tale of writing-mode Woe, http://www.zachleat.com/web/2010/02/12/css3-text-writing-mode/http://www.zachleat.com/web/2010/02/12/css3-text-writing-mode/ 
  8. ^ Talbot, Inherited margin with inherit keyword: the computed value's parent should be inherited, https://connect.microsoft.com/IE/feedback/ViewFeedback.aspx?FeedbackID=344787 
  9. ^ Groot, Sven, Overflow: scroll causes element to always have its max-height, https://connect.microsoft.com/IE/feedback/ViewFeedback.aspx?FeedbackID=408759 
  10. ^ Hopkins, James, visibility:visible applied to inline element doesn’t override inherited visibility:hidden value applied to it’s block-level parent, https://connect.microsoft.com/IE/feedback/ViewFeedback.aspx?FeedbackID=442805 
  11. ^ Content: attr(x) isn't updated when the attribute's value change, https://connect.microsoft.com/IE/feedback/ViewFeedback.aspx?FeedbackID=434925 
  12. ^ Shadow Filter, Microsoft, http://msdn.microsoft.com/en-us/library/ms533086(VS.85).aspx 
  13. ^ DropShadow Filter, Microsoft, http://msdn.microsoft.com/en-us/library/ms532985(VS.85).aspx 
  14. ^ Positioning, http://msdn.microsoft.com/en-us/library/cc351024(VS.85).aspx#positioning 
  15. ^ Hopkins, James, Illegal parsing of a z-index decimal value, instead of an integer, https://connect.microsoft.com/IE/feedback/details/386914/illegal-parsing-of-a-z-index-decimal-value-instead-of-an-integer 
  16. ^ Alpha Filter, Microsoft, http://msdn.microsoft.com/en-us/library/ms532967(VS.85).aspx 
  17. ^ IE7-/Escaping Background Image Bug - Demo 1, http://css-class.com/test/bugs/ie/escaping-background-image-bug1.htm 
  18. ^ IE7-/Escaping Background Image Bug - Demo 2, http://css-class.com/test/bugs/ie/escaping-background-image-bug2.htm 
  19. ^ Koch, Peter-Paul, IE Windows and Opera - font-weight: 600 vs. bold, QuirksMode, http://www.quirksmode.org/css/tests/iewin_fontweight.html 
  20. ^ Hopkins, James, 'text-align' value isn't inherited by ':before' and ':after' pseudo elements, https://connect.microsoft.com/IE/feedback/ViewFeedback.aspx?FeedbackID=454985 
  21. ^ Font and Text, Microsoft, http://msdn.microsoft.com/en-us/library/cc351024#font 

[edit] Gecko references

  1. ^ a b Bug 115199 - @page in CSS2 not implemented, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=115199 
  2. ^ Bug 506554 - Implement the CSS3 pseudo-classes :required and :optional, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=506554 
  3. ^ Bug 237119 - property 'display' is ignored for generated content, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=237119 
  4. ^ Bug 451134 - change -moz-border-radius* properties to css3-background names, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=451134 
  5. ^ Bug 590039 - fix blur radius computation and rename -moz-box-shadow to box-shadow, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=590039 
  6. ^ Bug 549809 - Rename background-origin and background-clip properties and values to match css3-background, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=549809 
  7. ^ Bug 3512 - (font-stretch) Implement font-stretch property, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=3512 
  8. ^ Bug 312156 - implement text-overflow: ellipsis from CSS3 text, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=312156 
  9. ^ Bug 249159 - implement 'word-break' properties of CSS3, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=249159 
  10. ^ hyphens - MDN Docs, Mozilla, https://developer.mozilla.org/en/CSS/hyphens  (Only English)
  11. ^ Bug 276079 - Implement text-justify property(but 'auto', 'inter-word', 'inter-ideograph' and 'distribute' only), Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=276079 
  12. ^ Bug 470547 - CSS3 text-outline not supported, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=470547 
  13. ^ Bug 59109 - implement CSS3 text module's text-decoration-style and text-decoration-color, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=59109 
  14. ^ Firefox 6 for developers, Mozilla, https://developer.mozilla.org/en/Firefox_6_for_developers 
  15. ^ Bug 145503 - (writing-mode) CSS3 writing-mode (vertical text), Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=145503 
  16. ^ Implement 'box-sizing' (dropping the -moz- prefix), Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=243412 
  17. ^ Bug 553576 - Implement css resize property behaviour, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=553576 
  18. ^ Bug 132035 - Implement missing page-break-* CSS2.1 features, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=132035 
  19. ^ Bug 137367 - Implement orphans and widows, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=137367 
  20. ^ Bug 47159 - Support css3-speech (previously Aural Style Sheet) properties in getComputedStyle, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=47159 
  21. ^ Bug 256274 - Implement CSS ruby module, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=256274 
  22. ^ Bug 446569 - Implement CSS3 columns shorthand, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=446569 
  23. ^ Native HTML5: First IE10 Platform Preview Available for Download, Microsoft, http://blogs.msdn.com/b/ie/archive/2011/04/12/native-html5-first-ie10-platform-preview-available-for-download.aspx 
  24. ^ Bug 616605 - CSS Grid Layout, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=616605 
  25. ^ Bug 435442 - Implement Webkit's CSS Animation proposal, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=435442 
  26. ^ Bug 505115 - CSS3 3D-Transforms, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=505115 
  27. ^ a b Bug 435441 - get CSS transitions complete enough to ship, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=537142 
  28. ^ Bug 562073 - implement box-lines property from css3-flexbox, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=562073 
  29. ^ Bug 2056 - display: run-in not implemented, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=2056 
  30. ^ Bug 18217 - display: inline-table not implemented, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=18217 
  31. ^ Bug 9458 - (inline-block) Implement inline-block in layout, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=9458 
  32. ^ New Web Developer Features in Deer Park Alpha 1, Mozilla, http://www.mozilla.org/projects/deerpark/new-web-dev-features.html 
  33. ^ Bug 382721 - Dotted/dashed -moz-border-radiused corners are rendered as solid, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=382721 
  34. ^ Bug 363249 - implement css3-values calc(), Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=363249 
  35. ^ Bug 435441 - Implement Webkit's CSS Transitions proposal, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=435441 
  36. ^ Bug 503720 - Implement vw/vh/vm (viewport sizes) from CSS 3 Values and Units, Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=503720 
  37. ^ Bug 282126 - What to do about the 'ch' length unit? (Mozilla vendor specific), Mozilla, https://bugzilla.mozilla.org/show_bug.cgi?id=282126 

[edit] Webkit references

  1. ^ Bug 35329 - Enhance CSS parser for Paged Media (Iteration 1), WebKit, https://bugs.webkit.org/show_bug.cgi?id=35329 
  2. ^ Bug 38731 - Make CSS Parser properly handle only-for-pages pseudo-classes, WebKit, https://bugs.webkit.org/show_bug.cgi?id=38731 
  3. ^ Bug 27458 - Support :default HTML5 CSS selector, Webkit, https://bugs.webkit.org/show_bug.cgi?id=27458 
  4. ^ Bug 27357 - Support :valid/:invalid CSS selectors, Webkit, https://bugs.webkit.org/show_bug.cgi?id=27357 
  5. ^ Bug 29071 - Support for :in-range and :out-of-range CSS selectors, Webkit, https://bugs.webkit.org/show_bug.cgi?id=29071 
  6. ^ Bug 25551 - Support for HTML5 Forms "required" attribute, Webkit, https://bugs.webkit.org/show_bug.cgi?id=25551 
  7. ^ Bug 3409 - CSS1: Safari ignores "text-transform" attribute in "first-line" CSS rules, Webkit, https://bugs.webkit.org/show_bug.cgi?id=3409 
  8. ^ Bug 23209 - [RFE] CSS Generated Content does not transition, Webkit, https://bugs.webkit.org/show_bug.cgi?id=23209 
  9. ^ Bug 27578 - Drop the prefix from the border-radius properties, Webkit, https://bugs.webkit.org/show_bug.cgi?id=27578 
  10. ^ Bug 51448 - Support unprefixed box-shadow property, WebKit, https://bugs.webkit.org/show_bug.cgi?id=51448 
  11. ^ Bug 3234 - CSS2: Implement better quote support (for the q tag), Webkit, https://bugs.webkit.org/show_bug.cgi?id=3234 
  12. ^ Bug 27562 - Drop the prefixes from background-clip and background-origin, WebKit, https://bugs.webkit.org/show_bug.cgi?id=27562 
  13. ^ [CSS3 Backgrounds and Borders] Drop the prefix from background-size, WebKit, https://bugs.webkit.org/show_bug.cgi?id=27575 
  14. ^ Bug 15257 - Support CSS 3 font-size-adjust, Webkit, https://bugs.webkit.org/show_bug.cgi?id=15257 
  15. ^ Bug 12530 - CSS3: Support the font-stretch property, Webkit, https://bugs.webkit.org/show_bug.cgi?id=12530 
  16. ^ Bug 63796 - Master: Support CSS3 font feature properties, Webkit, https://bugs.webkit.org/show_bug.cgi?id=63796 
  17. ^ Hyatt, Dave (2006-12-21), Introducing Text-Stroke, Surfin’ Safari, http://webkit.org/blog/85/introducing-text-stroke/ 
  18. ^ Bug 9475 - CSS3: Add support for font-effect: outline., WebKit, https://bugs.webkit.org/show_bug.cgi?id=9475 
  19. ^ Bug 18109 - Implement hanging punctuation, Webkit, https://bugs.webkit.org/show_bug.cgi?id=18109 
  20. ^ Bug 46123 - Implement writing-mode support for all of layout (master bug), WebKit, https://bugs.webkit.org/show_bug.cgi?id=46123 
  21. ^ Bug 48538 - Support the text-combine CSS property, WebKit, https://bugs.webkit.org/show_bug.cgi?id=48538 
  22. ^ Bug 36713 - Support box-sizing without the vendor prefix, WebKit, https://bugs.webkit.org/show_bug.cgi?id=36713 
  23. ^ Bug 10894 - CSS "size" property is not supported, Webkit, https://bugs.webkit.org/show_bug.cgi?id=10894 
  24. ^ Bug 46827 - AX: implement CSS3 Speech "speak", WebKit, https://bugs.webkit.org/show_bug.cgi?id=46827 
  25. ^ Bug 15552 - Support CSS3 column-break-before and column-break-after, WebKit, https://bugs.webkit.org/show_bug.cgi?id=15552 
  26. ^ Bug 39498 - [CSS3 Multi-column] Floating elements are rendered below the columns, WebKit, https://bugs.webkit.org/show_bug.cgi?id=39498#c7 
  27. ^ Bug 15550 - WebKit does not support CSS3 column-span:, Webkit, https://bugs.webkit.org/show_bug.cgi?id=15550 
  28. ^ Bug 60731 - Implement CSS3 Grid Layout (master bug), Webkit, https://bugs.webkit.org/show_bug.cgi?id=60731 
  29. ^ Scrolling text with -webkit-marquee, Ajnaware, 2008-08-14, http://ajnaware.wordpress.com/2008/08/14/scrolling-text-with-webkit-marquee/ 
  30. ^ Bug 8735 - CSS 2.1 visibility: collapse rendered as visibility: hidden, Webkit, https://bugs.webkit.org/show_bug.cgi?id=8735 
  31. ^ Bug 16662 - CSS3: Implement calc(), Webkit, https://bugs.webkit.org/show_bug.cgi?id=16662 
  32. ^ Fraser, Simon (2011-01-14). "CSS3 Gradients". Surfin’ Safari. WebKit. http://webkit.org/blog/1424/css3-gradients/. Retrieved 2011-01-16. 
  33. ^ Bug 27160 - Implement vw/vh/vm (viewport sizes) from CSS 3 Values and Units, Webkit, https://bugs.webkit.org/show_bug.cgi?id=27160 

[edit] Presto references

  1. ^ Storey, David (2010-11-23). "First browser to 11 (unless Chrome gets there first)". Opera. http://my.opera.com/ODIN/blog/first-browser-to-11-unless-chrome-gets-there-first. Retrieved 2010-11-23. 
  2. ^ Haavard (2010-08-09), New 10.70 snapshot with more Presto updates, Opera, http://my.opera.com/desktopteam/blog/2010/08/09/new-10-70-snapshot-with-more-presto-updates 
  3. ^ Haavard (2010-08-03), Presto update for Opera 10.70, Opera, http://my.opera.com/desktopteam/blog/2010/08/03/presto-update 
  4. ^ "CSS Multi-column Layout Module support in Opera Presto 2.8". Opera. 2011-03-06. http://www.opera.com/docs/specs/presto28/css/multicolumnlayout/. Retrieved 2011-03-06. 
  5. ^ Koch, Peter-Paul, :before/:after and content, Quirksmode, http://www.quirksmode.org/css/beforeafter_content.html 
  6. ^ Quantization error for em values in Opera 7–9.2, archived from the original on 2008-03-21, http://web.archive.org/web/20080321205550/http://www.brunildo.org/test/emarg.pl 

[edit] Prince XML references

  1. ^ a b c d e Prince: Unsupported features in CSS 2.1, YesLogic, http://www.princexml.com/doc/7.0/css21/ 

[edit] Other references

[edit] External links

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