<s>
CSS	B-Application
animations	I-Application
is	O
a	O
proposed	O
module	O
for	O
Cascading	B-Language
Style	I-Language
Sheets	I-Language
that	O
allows	O
the	O
animation	O
of	O
HTML	B-Language
document	O
elements	O
using	O
CSS	B-Language
.	O
</s>
<s>
While	O
the	O
pseudo-class	B-Language
:hover	O
has	O
been	O
used	O
to	O
generate	O
rudimentary	O
animations	O
for	O
years	O
,	O
extensions	O
of	O
CSS	B-Language
into	O
the	O
realm	O
of	O
animation	O
were	O
minimal	O
until	O
the	O
late	O
2000s	O
decade	O
.	O
</s>
<s>
As	O
early	O
as	O
2007	O
,	O
WebKit	B-Language
had	O
announced	O
its	O
intent	O
to	O
include	O
CSS	B-Application
animation	I-Application
,	O
transitions	O
,	O
and	O
transforms	O
as	O
features	O
of	O
WebKit	B-Language
.	O
</s>
<s>
It	O
also	O
announced	O
the	O
implementation	O
of	O
both	O
implicit	O
and	O
explicit	O
animation	O
through	O
CSS	B-Language
in	O
February	O
2009	O
.	O
</s>
<s>
CSS	B-Application
animation	I-Application
has	O
also	O
been	O
put	O
forth	O
as	O
a	O
feature	O
of	O
CSS3	O
,	O
the	O
ongoing	O
draft	O
specification	O
managed	O
by	O
the	O
World	O
Wide	O
Web	O
Consortium	O
(	O
W3C	O
)	O
.	O
</s>
<s>
CSS	B-Application
Animations	I-Application
is	O
a	O
module	O
of	O
Cascading	B-Language
Style	I-Language
Sheets	I-Language
.	O
</s>
<s>
Despite	O
the	O
controversy	O
from	O
those	O
who	O
prefer	O
animation	O
via	O
Javascript	B-Language
,	O
the	O
hover	O
tag	O
is	O
now	O
widely	O
used	O
across	O
the	O
Cascading	B-Language
Style	I-Language
Sheets	I-Language
community	O
.	O
</s>
<s>
In	O
addition	O
to	O
hover	O
,	O
Scalable	B-Application
Vector	I-Application
Graphics	I-Application
supports	O
the	O
@keyframes	O
at-rule	O
,	O
allowing	O
a	O
limited	O
set	O
of	O
transformations	O
to	O
be	O
animated	O
.	O
</s>
<s>
Firefox	O
and	O
Chrome	B-Application
used	O
the	O
@	O
-moz-keyframes	O
and	O
@	O
-webkit-keyframes	O
extensions	O
,	O
respectively	O
,	O
before	O
@keyframes	O
was	O
added	O
to	O
the	O
CSS	B-Language
3	I-Language
specification	O
.	O
</s>
<s>
As	O
of	O
June	O
2011	O
,	O
Firefox	O
5	O
includes	O
CSS	B-Application
animations	I-Application
support	O
.	O
</s>
<s>
CSS	B-Application
animation	I-Application
is	O
also	O
available	O
as	O
a	O
module	O
in	O
the	O
nightly	O
builds	O
of	O
WebKit	B-Language
as	O
well	O
as	O
Google	B-Application
Chrome	I-Application
,	O
Safari	B-Application
4	O
and	O
5	O
and	O
Safari	B-Application
for	O
iOS	B-Application
(	O
iPhone	O
,	O
iPod	O
Touch	O
,	O
iPad	O
)	O
,	O
Android	B-Application
versions	O
2.x	O
and	O
3.x	O
,	O
Internet	B-Application
Explorer	I-Application
10+	O
and	O
Microsoft	B-Application
Edge	I-Application
browser	O
,	O
the	O
BlackBerry	O
OS	O
6	O
web	O
browser	O
,	O
with	O
the	O
-webkit	O
-	O
prefix	O
.	O
</s>
<s>
It	O
is	O
also	O
used	O
in	O
iTunes	B-Operating_System
9	I-Operating_System
to	O
support	O
iTunes	B-Operating_System
LP	O
files	O
.	O
</s>
<s>
Early	O
on	O
in	O
the	O
development	O
of	O
the	O
CSS	B-Application
animation	I-Application
it	O
had	O
drawn	O
concern	O
from	O
those	O
who	O
prefer	O
animation	O
via	O
JavaScript	B-Language
or	O
,	O
to	O
a	O
lesser-used	O
extent	O
,	O
Synchronized	B-Language
Multimedia	I-Language
Integration	I-Language
Language	I-Language
(	O
SMIL	O
)	O
;	O
others	O
have	O
claimed	O
that	O
it	O
is	O
a	O
move	O
by	O
Apple	O
Inc.	O
,	O
the	O
main	O
sponsor	O
of	O
the	O
WebKit	B-Language
project	O
,	O
to	O
sidestep	O
the	O
inclusion	O
of	O
Adobe	B-Operating_System
Flash	I-Operating_System
(	O
and	O
the	O
incumbent	O
Flash	B-Operating_System
animations	I-Operating_System
)	O
on	O
the	O
company	O
's	O
iOS	B-Application
line	O
of	O
mobile	O
devices	O
which	O
use	O
Safari	B-Application
.	O
</s>
<s>
Furthermore	O
,	O
although	O
Cascading	B-Language
Style	I-Language
Sheets	I-Language
is	O
a	O
relatively	O
easy	O
to	O
use	O
programming	O
language	O
,	O
many	O
programmers	O
still	O
struggle	O
with	O
making	O
animations	O
.	O
</s>
<s>
With	O
this	O
problem	O
,	O
several	O
individuals	O
and	O
websites	O
have	O
developed	O
and	O
created	O
open	O
source	O
CSS	B-Language
button	O
animations	O
with	O
code	O
for	O
users	O
to	O
copy	O
.	O
</s>
<s>
However	O
,	O
even	O
with	O
these	O
previous	O
controversies	O
,	O
CSS	B-Application
animations	I-Application
can	O
be	O
predominantly	O
found	O
and	O
widely	O
used	O
across	O
the	O
internet	O
.	O
</s>
