CSS3 is not yet a W3C standard, but all the major browsers are already supporting many of the new features. Below is a reference off all the new CSS3 properties and their browser support:

Property	IE	Firefox	Chrome	Safari	Opera
alignment-adjust
alignment-baseline
animation		5
animation-name		5
animation-duration		5
animation-timing-function		5
animation-delay		5
animation-iteration-count		5
animation-direction		5
animation-play-state		5
appearance		3
backface-visibility
background-clip	9	4	10	5	10.5
background-origin	9	4	4	5	10.5
background-size	9	4	4	5	10.5
baseline-shift
bookmark-label
bookmark-level
bookmark-target
border-bottom-left-radius	9	4	5	5	10.5
border-bottom-right-radius	9	4	5	5	10.5
border-image				3
border-image-outset
border-image-repeat
border-image-slice
border-image-source
border-image-width
border-radius	9	4	5	5	10.5
border-top-left-radius	9	4	5	5	10.5
border-top-right-radius	9	4	5	5	10.5
box-decoration-break
box-align
box-direction
box-flex
box-flex-group
box-lines
box-ordinal-group
box-orient
box-pack
box-shadow	9	4	10		10.5
box-sizing	8		9
color-profile
column-fill
column-gap
column-rule
column-rule-color
column-rule-style
column-rule-width
column-span
column-width
columns
column-count
crop
dominant-baseline
drop-initial-after-adjust
drop-initial-after-align
drop-initial-before-adjust
drop-initial-before-align
drop-initial-size
drop-initial-value
fit
fit-position
float-offset
@font-face	9	3.6	4	3	10
font-size-adjust		2
font-stretch
grid-columns
grid-rows
hanging-punctuation
hyphenate-after
hyphenate-before
hyphenate-characters
hyphenate-lines
hyphenate-resource
hyphens
icon
image-orientation
image-resolution
@keyframes		4
inline-box-align
line-stacking
line-stacking-ruby
line-stacking-shift
line-stacking-strategy
mark
mark-after
mark-before
marks
marquee-direction
marquee-play-count
marquee-speed
marquee-style
move-to
nav-down					11.5
nav-index					11.5
nav-left					11.5
nav-right					11.5
nav-up					11.5
opacity	9	2	4	4	10
outline-offset					11
overflow-style
overflow-x	9	2
overflow-y	9	2
page
page-policy
perspective				5
perspective-origin
phonemes
punctuation-trim
rendering-intent
resize		4
rest
rest-after
rest-before
rotation
rotation-point
ruby-align
ruby-overhang
ruby-position
ruby-span
size
string-set
target
target-name
target-new
target-position
text-align-last
text-emphasis
text-height
text-justify	5
text-outline
text-overflow	5	7	4	4	10.6
text-shadow		3	4	4	10
text-wrap
transform	9	3.6
transform-origin	9	3.6
transform-style				5
transition		4
transition-property		4
transition-duration		4
transition-timing-function		4
transition-delay		4
word-break	5		8	3
word-wrap	5	3.6
voice-balance
voice-duration
voice-pitch
voice-pitch-range
voice-rate
voice-stress
voice-volume

Icon Explanations

	Supported by Internet Explorer
	Supported by Firefox
	Supported by Google Chrome
	Supported by Safari
	Supported by Opera

	Supported by Internet Explorer with the prefix -ms-
	Supported by Firefox with the prefix -moz-
	Supported by Google Chrome with the prefix -webkit-
	Supported by Safari with the prefix -webkit-
	Supported by Opera with the prefix -o-
	Supported by Opera with the prefix -xv-

For some properties you see the browser icon and a number:

10.5

The number indicates in which browser version the property was first supported.

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