<s>
WebKit	B-Language
is	O
a	O
browser	B-Protocol
engine	I-Protocol
developed	O
by	O
Apple	O
and	O
primarily	O
used	O
in	O
its	O
Safari	B-Application
web	I-Application
browser	I-Application
,	O
as	O
well	O
as	O
all	O
web	B-Language
browsers	O
on	O
iOS	B-Application
and	O
iPadOS	B-Operating_System
.	O
</s>
<s>
WebKit	B-Language
is	O
also	O
used	O
by	O
the	O
PlayStation	B-Device
consoles	I-Device
beginning	O
from	O
the	O
PS3	O
,	O
the	O
Tizen	B-Application
mobile	O
operating	B-General_Concept
systems	I-General_Concept
,	O
the	B-General_Concept
Amazon	I-General_Concept
Kindle	I-General_Concept
e-book	O
reader	O
,	O
Nintendo	O
consoles	O
beginning	O
from	O
the	O
3DS	O
Internet	O
Browser	O
,	O
and	O
the	O
discontinued	O
BlackBerry	B-Operating_System
Browser	I-Operating_System
.	O
</s>
<s>
WebKit	B-Language
's	O
C++	B-Language
application	B-Application
programming	I-Application
interface	I-Application
(	O
API	B-Application
)	O
provides	O
a	O
set	O
of	O
classes	O
to	O
display	O
Web	B-Language
content	O
in	O
windows	B-Application
,	O
and	O
implements	O
browser	O
features	O
such	O
as	O
following	O
links	O
when	O
clicked	O
by	O
the	O
user	O
,	O
managing	O
a	O
back-forward	O
list	O
,	O
and	O
managing	O
a	O
history	O
of	O
pages	O
recently	O
visited	O
.	O
</s>
<s>
WebKit	B-Language
started	O
as	O
a	O
fork	B-Application
of	O
the	O
KHTML	B-Language
and	O
KJS	B-Language
libraries	O
from	O
KDE	B-Application
,	O
and	O
has	O
since	O
been	O
further	O
developed	O
by	O
KDE	B-Application
contributors	O
,	O
Apple	O
,	O
Google	B-Application
,	O
Nokia	O
,	O
Bitstream	O
,	O
BlackBerry	B-Application
,	O
Sony	O
,	O
Igalia	O
,	O
and	O
others	O
.	O
</s>
<s>
WebKit	B-Language
supports	O
macOS	B-Application
,	O
Windows	B-Application
,	O
Linux	B-Application
,	O
and	O
various	O
other	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
.	O
</s>
<s>
On	O
April	O
3	O
,	O
2013	O
,	O
Google	B-Application
announced	O
that	O
it	O
had	O
forked	O
WebCore	B-Language
,	O
a	O
component	O
of	O
WebKit	B-Language
,	O
to	O
be	O
used	O
in	O
future	O
versions	O
of	O
Google	B-Application
Chrome	I-Application
and	O
the	O
Opera	B-Application
web	I-Application
browser	I-Application
,	O
under	O
the	O
name	O
Blink	B-Language
.	O
</s>
<s>
WebKit	B-Language
is	O
available	O
under	O
the	O
BSD	B-Operating_System
2-Clause	I-Operating_System
license	O
with	O
the	O
exception	O
of	O
the	O
WebCore	B-Language
and	O
JavaScriptCore	O
components	O
,	O
which	O
are	O
available	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
.	O
</s>
<s>
As	O
of	O
March	O
7	O
,	O
2013	O
,	O
WebKit	B-Language
is	O
a	O
trademark	O
of	O
Apple	O
,	O
registered	O
with	O
the	O
U.S.	O
Patent	O
and	O
Trademark	O
Office	O
.	O
</s>
<s>
The	O
code	O
that	O
would	O
become	O
WebKit	B-Language
began	O
in	O
1998	O
as	O
the	O
KDE	B-Application
HTML	O
(	O
KHTML	B-Language
)	O
layout	B-Protocol
engine	I-Protocol
and	O
KDE	B-Application
JavaScript	O
(	O
KJS	B-Language
)	O
engine	O
.	O
</s>
<s>
The	O
WebKit	B-Language
project	O
was	O
started	O
within	O
Apple	O
by	O
Don	O
Melton	O
on	O
June	O
25	O
,	O
2001	O
,	O
as	O
a	O
fork	B-Application
of	O
KHTML	B-Language
and	O
KJS	B-Language
.	O
</s>
<s>
Melton	O
explained	O
in	O
an	O
e-mail	O
to	O
KDE	B-Application
developers	O
that	O
KHTML	B-Language
and	O
KJS	B-Language
allowed	O
easier	O
development	O
than	O
other	O
available	O
technologies	O
by	O
virtue	O
of	O
being	O
small	O
(	O
fewer	O
than	O
140,000	O
lines	O
of	O
code	O
)	O
,	O
cleanly	O
designed	O
and	O
standards-compliant	O
.	O
</s>
<s>
KHTML	B-Language
and	O
KJS	B-Language
was	O
ported	O
to	O
macOS	B-Application
with	O
the	O
help	O
of	O
an	O
adapter	O
library	B-Library
and	O
renamed	O
WebCore	B-Language
and	O
JavaScriptCore	O
.	O
</s>
<s>
JavaScriptCore	O
was	O
announced	O
in	O
an	O
e-mail	O
to	O
a	O
KDE	B-Application
mailing	O
list	O
in	O
June	O
2002	O
,	O
alongside	O
the	O
first	O
release	O
of	O
Apple	O
's	O
changes	O
.	O
</s>
<s>
According	O
to	O
Apple	O
,	O
some	O
changes	O
which	O
called	O
for	O
different	O
development	O
tactics	O
involved	O
macOS-specific	O
features	O
that	O
are	O
absent	O
in	O
KDE	B-Application
's	O
KHTML	B-Language
,	O
such	O
as	O
Objective-C	B-Language
,	O
KWQ	O
(	O
pronounced	O
"	O
quack	O
"	O
)	O
an	O
implementation	O
of	O
the	O
subset	O
of	O
Qt	B-Language
required	O
to	O
make	O
KHTML	B-Language
work	O
on	O
macOS	B-Application
written	O
in	O
Objective	O
C++	O
,	O
and	O
macOS	B-Application
calls	O
.	O
</s>
<s>
The	O
exchange	O
of	O
code	O
between	O
WebCore	B-Language
and	O
KHTML	B-Language
became	O
increasingly	O
difficult	O
as	O
the	O
code	O
base	O
diverged	O
because	O
both	O
projects	O
had	O
different	O
approaches	O
in	O
coding	O
and	O
code	O
sharing	O
.	O
</s>
<s>
At	O
one	O
point	O
KHTML	B-Language
developers	O
said	O
they	O
were	O
unlikely	O
to	O
accept	O
Apple	O
's	O
changes	O
and	O
claimed	O
the	O
relationship	O
between	O
the	O
two	O
groups	O
was	O
a	O
"	O
bitter	O
failure	O
"	O
.	O
</s>
<s>
Thus	O
,	O
these	O
patches	O
were	O
difficult	O
for	O
the	O
KDE	B-Application
developers	O
to	O
integrate	O
back	O
into	O
KHTML	B-Language
.	O
</s>
<s>
During	O
the	O
publicized	O
"	O
divorce	O
"	O
period	O
,	O
KDE	B-Application
developer	O
Kurt	O
Pfeifle	O
(	O
pipitas	O
)	O
posted	O
an	O
article	O
claiming	O
KHTML	B-Language
developers	O
had	O
managed	O
to	O
backport	O
many	O
(	O
but	O
not	O
all	O
)	O
Safari	B-Application
improvements	O
from	O
WebCore	B-Language
to	O
KHTML	B-Language
,	O
and	O
they	O
always	O
appreciated	O
the	O
improvements	O
coming	O
from	O
Apple	O
and	O
still	O
do	O
so	O
.	O
</s>
<s>
The	O
article	O
also	O
noted	O
Apple	O
had	O
begun	O
to	O
contact	O
KHTML	B-Language
developers	O
about	O
discussing	O
how	O
to	O
improve	O
the	O
mutual	O
relationship	O
and	O
ways	O
of	O
future	O
cooperation	O
.	O
</s>
<s>
In	O
fact	O
,	O
the	O
KDE	B-Application
project	O
was	O
able	O
to	O
incorporate	O
some	O
of	O
these	O
changes	O
to	O
improve	O
KHTML	B-Language
's	O
rendering	O
speed	O
and	O
add	O
features	O
,	O
including	O
compliance	O
with	O
the	O
Acid2	O
rendering	O
test	O
.	O
</s>
<s>
Following	O
the	O
appearance	O
of	O
a	O
story	O
of	O
the	O
fork	B-Application
in	O
the	O
news	O
,	O
Apple	O
released	O
the	O
source	O
code	O
of	O
the	O
WebKit	B-Language
fork	B-Application
in	O
a	O
public	O
revision-control	B-Architecture
repository	O
.	O
</s>
<s>
The	O
WebKit	B-Language
team	O
had	O
also	O
reversed	O
many	O
Apple-specific	O
changes	O
in	O
the	O
original	O
WebKit	B-Language
code	O
base	O
and	O
implemented	O
platform-specific	O
abstraction	O
layers	O
to	O
make	O
committing	O
the	O
core	O
rendering	O
code	O
to	O
other	O
platforms	O
significantly	O
easier	O
.	O
</s>
<s>
In	O
July	O
2007	O
,	O
Ars	O
Technica	O
reported	O
that	O
the	O
KDE	B-Application
team	O
would	O
move	O
from	O
KHTML	B-Language
to	O
WebKit	B-Language
.	O
</s>
<s>
Instead	O
,	O
after	O
several	O
years	O
of	O
integration	O
,	O
KDE	B-Application
Development	O
Platform	O
version	O
4.5.0	O
was	O
released	O
in	O
August	O
2010	O
with	O
support	O
for	O
both	O
WebKit	B-Language
and	O
KHTML	B-Language
,	O
and	O
development	O
of	O
KHTML	B-Language
continues	O
.	O
</s>
<s>
On	O
June	O
7	O
,	O
2005	O
,	O
Safari	B-Application
developer	O
Dave	O
Hyatt	O
announced	O
on	O
his	O
weblog	O
that	O
Apple	O
was	O
open-sourcing	O
WebKit	B-Language
(	O
formerly	O
,	O
only	O
WebCore	B-Language
and	O
JavaScriptCore	O
were	O
open	O
source	O
)	O
and	O
opening	O
up	O
access	O
to	O
WebKit	B-Language
's	O
revision	B-Architecture
control	I-Architecture
tree	O
and	O
the	O
issue	O
tracker	O
.	O
</s>
<s>
In	O
mid-December	O
2005	O
,	O
support	O
for	O
Scalable	B-Application
Vector	I-Application
Graphics	I-Application
(	O
SVG	B-Application
)	O
was	O
merged	O
into	O
the	O
standard	O
build	O
.	O
</s>
<s>
WebKit	B-Language
's	O
JavaScriptCore	O
and	O
WebCore	B-Language
components	O
are	O
available	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
,	O
while	O
the	O
rest	O
of	O
WebKit	B-Language
is	O
available	O
under	O
the	O
BSD	B-Operating_System
2-Clause	I-Operating_System
license	O
.	O
</s>
<s>
Beginning	O
in	O
early	O
2007	O
,	O
the	O
development	O
team	O
began	O
to	O
implement	O
Cascading	B-Language
Style	I-Language
Sheets	I-Language
(	O
CSS	B-Language
)	O
extensions	O
,	O
including	O
animation	B-Application
,	O
transitions	O
and	O
both	O
2D	O
and	O
3D	O
transforms	O
;	O
such	O
extensions	O
were	O
released	O
as	O
working	O
drafts	O
to	O
the	O
World	O
Wide	O
Web	B-Language
Consortium	O
(	O
W3C	O
)	O
in	O
2009	O
for	O
standardization	O
.	O
</s>
<s>
In	O
November	O
2007	O
,	O
the	O
project	O
announced	O
that	O
it	O
had	O
added	O
support	O
for	O
media	O
features	O
of	O
the	O
HTML5	B-Application
draft	O
specification	O
,	O
allowing	O
embedded	O
video	O
to	O
be	O
natively	O
rendered	O
and	O
script-controlled	O
in	O
WebKit	B-Language
.	O
</s>
<s>
On	O
June	O
2	O
,	O
2008	O
,	O
the	O
WebKit	B-Language
project	O
announced	O
they	O
rewrote	O
JavaScriptCore	O
as	O
"	O
SquirrelFish	O
"	O
,	O
a	O
bytecode	O
interpreter	B-Application
.	O
</s>
<s>
The	O
project	O
evolved	O
into	O
SquirrelFish	O
Extreme	O
(	O
abbreviated	O
SFX	O
)	O
,	O
announced	O
on	O
September	O
18	O
,	O
2008	O
,	O
which	O
compiles	B-Language
JavaScript	O
into	O
native	O
machine	B-Language
code	I-Language
,	O
eliminating	O
the	O
need	O
for	O
a	O
bytecode	O
interpreter	B-Application
and	O
thus	O
speeding	O
up	O
JavaScript	O
execution	O
.	O
</s>
<s>
Initially	O
,	O
the	O
only	O
supported	O
processor	O
architecture	O
for	O
SFX	O
was	O
the	O
x86	B-Operating_System
,	O
but	O
at	O
the	O
end	O
of	O
January	O
2009	O
,	O
SFX	O
was	O
enabled	O
for	O
macOS	B-Application
on	O
x86-64	B-Device
as	O
it	O
passes	O
all	O
tests	O
on	O
that	O
platform	O
.	O
</s>
<s>
On	O
April	O
8	O
,	O
2010	O
,	O
a	O
project	O
named	O
WebKit2	O
was	O
announced	O
to	O
redesign	O
WebKit	B-Language
.	O
</s>
<s>
Its	O
goal	O
was	O
to	O
abstract	O
the	O
components	O
that	O
provide	O
web	B-Protocol
rendering	I-Protocol
cleanly	O
from	O
their	O
surrounding	O
interface	O
or	O
application	O
shell	O
,	O
creating	O
a	O
situation	O
where	O
,	O
"	O
web	B-Language
content	O
(	O
JavaScript	O
,	O
HTML	O
,	O
layout	O
,	O
etc	O
)	O
lives	O
in	O
a	O
separate	O
process	O
from	O
the	O
application	O
UI	O
"	O
.	O
</s>
<s>
This	O
abstraction	O
was	O
intended	O
to	O
make	O
reuse	O
a	O
more	O
straightforward	O
process	O
for	O
WebKit2	O
than	O
for	O
WebKit	B-Language
.	O
</s>
<s>
WebKit2	O
had	O
"	O
an	O
incompatible	O
API	B-Application
change	O
from	O
the	O
original	O
WebKit	B-Language
"	O
,	O
which	O
motivated	O
its	O
name	O
change	O
.	O
</s>
<s>
The	O
WebKit2	O
targets	O
were	O
set	O
to	O
Linux	B-Application
,	O
macOS	B-Application
,	O
Windows	B-Application
,	O
GTK	B-Application
,	O
and	O
MeeGo-Harmattan	O
.	O
</s>
<s>
Safari	B-Application
for	O
macOS	B-Application
switched	O
to	O
the	O
new	O
API	B-Application
with	O
version	O
5.1	O
.	O
</s>
<s>
Safari	B-Application
for	O
iOS	B-Application
switched	O
to	O
WebKit2	O
with	O
iOS	B-Application
8	O
.	O
</s>
<s>
The	O
original	O
WebKit	B-Language
API	B-Application
has	O
been	O
renamed	O
WebKitLegacy	O
API	B-Application
.	O
</s>
<s>
WebKit2	O
API	B-Application
has	O
been	O
renamed	O
just	O
plain	O
WebKit	B-Language
API	B-Application
.	O
</s>
<s>
WebKit	B-Language
is	O
used	O
as	O
the	O
rendering	O
engine	O
within	O
Safari	B-Application
and	O
was	O
formerly	O
used	O
by	O
Google	B-Application
's	I-Application
Chrome	B-Application
web	I-Application
browser	I-Application
on	O
Windows	B-Application
,	O
macOS	B-Application
,	O
and	O
Android	B-Application
(	O
before	O
version	O
4.4	O
KitKat	O
)	O
.	O
</s>
<s>
Chrome	B-Application
used	O
only	O
WebCore	B-Language
,	O
and	O
included	O
its	O
own	O
JavaScript	B-Language
engine	I-Language
named	O
V8	B-Language
and	O
a	O
multiprocess	O
system	O
.	O
</s>
<s>
Chrome	B-Application
for	O
iOS	B-Application
continues	O
to	O
use	O
WebKit	B-Language
because	O
Apple	O
requires	O
that	O
web	B-Language
browsers	O
on	O
that	O
platform	O
must	O
do	O
so	O
.	O
</s>
<s>
Other	O
applications	O
on	O
macOS	B-Application
and	O
iOS	B-Application
make	O
use	O
of	O
WebKit	B-Language
,	O
such	O
as	O
Apple	O
's	O
e-mail	O
client	O
Mail	B-Operating_System
,	O
App	O
Store	O
,	O
and	O
the	O
2008	O
version	O
of	O
Microsoft	O
's	O
Entourage	B-Application
personal	B-Application
information	I-Application
manager	I-Application
,	O
both	O
of	O
which	O
make	O
use	O
of	O
WebKit	B-Language
to	O
render	O
HTML	O
content	O
.	O
</s>
<s>
New	O
web	B-Language
browsers	O
have	O
been	O
built	O
around	O
WebKit	B-Language
such	O
as	O
the	O
S60	B-Language
browser	I-Language
on	O
Symbian	B-Operating_System
mobile	O
phones	O
,	O
BlackBerry	B-Operating_System
Browser	I-Operating_System
(	O
ver	O
6.0	O
+	O
)	O
,	O
Midori	B-Protocol
,	O
Chrome	B-Application
browser	I-Application
,	O
the	O
Android	B-Application
Web	B-Language
browser	O
before	O
version	O
4.4	O
KitKat	O
,	O
and	O
the	O
browser	O
used	O
in	O
PlayStation	B-Operating_System
3	I-Operating_System
system	I-Operating_System
software	I-Operating_System
from	O
version	O
4.10	O
.	O
</s>
<s>
KDE	B-Application
's	O
Rekonq	B-Language
web	B-Language
browser	O
and	O
Plasma	B-Language
Workspaces	I-Language
also	O
use	O
it	O
as	O
the	O
native	O
web	B-Protocol
rendering	I-Protocol
engine	O
.	O
</s>
<s>
WebKit	B-Language
has	O
been	O
adopted	O
as	O
the	O
rendering	O
engine	O
in	O
OmniWeb	B-Protocol
,	O
iCab	B-Operating_System
and	O
Web	B-Language
(	O
formerly	O
named	O
Epiphany	B-Language
)	O
and	O
Sleipnir	B-Application
,	O
replacing	O
their	O
original	O
rendering	B-Protocol
engines	I-Protocol
.	O
</s>
<s>
GNOME	O
's	O
Web	B-Language
supported	O
both	O
Gecko	B-Language
and	O
WebKit	B-Language
for	O
some	O
time	O
,	O
but	O
the	O
team	O
decided	O
that	O
Gecko	B-Language
's	O
release	O
cycle	O
and	O
future	O
development	O
plans	O
would	O
make	O
it	O
too	O
cumbersome	O
to	O
continue	O
supporting	O
it	O
.	O
</s>
<s>
webOS	B-Operating_System
uses	O
WebKit	B-Language
as	O
the	O
basis	O
of	O
its	O
application	O
runtime	O
.	O
</s>
<s>
WebKit	B-Language
is	O
used	O
to	O
render	O
HTML	O
and	O
run	O
JavaScript	O
in	O
the	O
Adobe	B-Operating_System
Integrated	I-Operating_System
Runtime	I-Operating_System
application	O
platform	O
.	O
</s>
<s>
In	O
Adobe	B-Operating_System
Creative	I-Operating_System
Suite	I-Operating_System
CS5	O
,	O
WebKit	B-Language
is	O
used	O
to	O
render	O
some	O
parts	O
of	O
the	O
user	O
interface	O
.	O
</s>
<s>
As	O
of	O
the	O
first	O
half	O
of	O
2010	O
,	O
an	O
analyst	O
estimated	O
the	O
cumulative	O
number	O
of	O
mobile	O
handsets	O
shipped	O
with	O
a	O
WebKit-based	O
browser	O
at	O
350	O
million	O
.	O
</s>
<s>
By	O
mid-April	O
2015	O
,	O
WebKit	B-Language
browser	B-Application
market	I-Application
share	I-Application
was	O
50.3	O
%	O
.	O
</s>
<s>
The	O
week	O
after	O
Hyatt	O
announced	O
WebKit	B-Language
's	O
open-sourcing	O
,	O
Nokia	O
announced	O
that	O
it	O
had	O
ported	O
WebKit	B-Language
to	O
the	O
Symbian	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
and	O
was	O
developing	O
a	O
browser	O
based	O
on	O
WebKit	B-Language
for	O
mobile	O
phones	O
running	O
S60	B-Language
.	O
</s>
<s>
Named	O
Web	B-Language
Browser	I-Language
for	I-Language
S60	I-Language
,	O
it	O
was	O
used	O
on	O
Nokia	O
,	O
Samsung	B-Application
,	O
LG	O
,	O
and	O
other	O
Symbian	B-Language
S60	I-Language
mobile	O
phones	O
.	O
</s>
<s>
Apple	O
has	O
also	O
ported	O
WebKit	B-Language
to	O
iOS	B-Application
to	O
run	O
on	O
the	O
iPhone	B-Device
,	O
iPod	B-Device
Touch	I-Device
,	O
and	O
iPad	B-Device
,	O
where	O
it	O
is	O
used	O
to	O
render	O
content	O
in	O
the	O
device	O
's	O
web	B-Language
browser	O
and	O
e-mail	O
software	O
.	O
</s>
<s>
The	O
Android	B-Application
mobile	I-Application
phone	I-Application
platform	I-Application
used	O
WebKit	B-Language
(	O
and	O
later	O
versions	O
its	O
Blink	B-Language
fork	I-Language
)	O
as	O
the	O
basis	O
of	O
its	O
web	B-Language
browser	O
and	O
the	O
Palm	B-Application
Pre	I-Application
,	O
announced	O
January	O
2009	O
,	O
has	O
an	O
interface	O
based	O
on	O
WebKit	B-Language
.	O
</s>
<s>
The	B-General_Concept
Amazon	I-General_Concept
Kindle	I-General_Concept
3	O
includes	O
an	O
experimental	O
WebKit	B-Language
based	O
browser	O
.	O
</s>
<s>
In	O
June	O
2007	O
,	O
Apple	O
announced	O
that	O
WebKit	B-Language
had	O
been	O
ported	O
to	O
Microsoft	B-Application
Windows	I-Application
as	O
part	O
of	O
Safari	B-Application
.	O
</s>
<s>
Although	O
Safari	B-Application
for	I-Application
Windows	I-Application
was	O
silently	O
discontinued	O
by	O
the	O
company	O
,	O
WebKit	B-Language
's	O
ports	O
to	O
Microsoft	O
's	O
operating	B-General_Concept
system	I-General_Concept
are	O
still	O
actively	O
maintained	O
.	O
</s>
<s>
The	O
Windows	B-Application
port	O
uses	O
Apple	O
's	O
proprietary	O
libraries	O
to	O
function	O
and	O
is	O
used	O
for	O
iCloud	O
and	O
iTunes	O
for	O
Windows	B-Application
,	O
whereas	O
the	O
"	O
WinCairo	O
"	O
port	O
is	O
a	O
fully	O
open-source	O
and	O
redistributable	O
port	O
.	O
</s>
<s>
WebKit	B-Language
has	O
also	O
been	O
ported	O
to	O
several	O
toolkits	O
that	O
support	O
multiple	B-Operating_System
platforms	I-Operating_System
,	O
such	O
as	O
the	O
GTK	B-Application
toolkit	I-Application
for	O
Linux	B-Application
,	O
under	O
the	O
name	O
WebKitGTK	O
which	O
is	O
used	O
by	O
Eolie	O
,	O
GNOME	B-Language
Web	I-Language
,	O
Adobe	B-Operating_System
Integrated	I-Operating_System
Runtime	I-Operating_System
,	O
Enlightenment	B-Library
Foundation	I-Library
Libraries	I-Library
(	O
EFL	O
)	O
,	O
and	O
the	O
Clutter	B-Language
toolkit	O
.	O
</s>
<s>
Qt	B-Language
Software	I-Language
included	O
a	O
WebKit	B-Language
port	O
in	O
the	O
Qt	B-Language
4.4	O
release	O
as	O
a	O
module	O
called	O
QtWebKit	O
(	O
since	O
superseded	O
by	O
Qt	B-Language
WebEngine	O
,	O
which	O
uses	O
Blink	B-Language
instead	O
)	O
.	O
</s>
<s>
The	O
Iris	B-Operating_System
Browser	I-Operating_System
on	O
Qt	B-Language
also	O
used	O
WebKit	B-Language
.	O
</s>
<s>
The	O
Enlightenment	B-Library
Foundation	I-Library
Libraries	I-Library
(	O
EFL	O
)	O
port	O
–	O
EWebKit	O
–	O
was	O
developed	O
(	O
by	O
Samsung	B-Application
and	O
ProFusion	O
)	O
focusing	O
the	O
embedded	O
and	O
mobile	O
systems	O
,	O
for	O
use	O
as	O
stand	O
alone	O
browser	O
,	O
widgets-gadgets	O
,	O
rich	O
text	O
viewer	O
and	O
composer	O
.	O
</s>
<s>
The	O
Clutter	B-Language
port	O
is	O
developed	O
by	O
Collabora	O
and	O
sponsored	O
by	O
Robert	O
Bosch	O
GmbH	O
.	O
</s>
<s>
There	O
was	O
also	O
a	O
project	O
synchronized	O
with	O
WebKit	B-Language
(	O
sponsored	O
by	O
Pleyo	O
)	O
called	O
Origyn	B-Application
Web	I-Application
Browser	I-Application
,	O
which	O
provided	O
a	O
meta-port	O
to	O
an	O
abstract	O
platform	O
with	O
the	O
aim	O
of	O
making	O
porting	O
to	O
embedded	O
or	O
lightweight	O
systems	O
quicker	O
and	O
easier	O
.	O
</s>
<s>
This	O
port	O
is	O
used	O
for	O
embedded	O
devices	O
such	O
as	O
set-top	O
boxes	O
,	O
PMP	O
and	O
it	O
has	O
been	O
ported	O
into	O
AmigaOS	B-Application
,	O
AROS	B-Application
and	O
MorphOS	B-Operating_System
.	O
</s>
<s>
MorphOS	B-Operating_System
version	O
1.7	O
is	O
the	O
first	O
version	O
of	O
Origyn	B-Application
Web	I-Application
Browser	I-Application
(	O
OWB	O
)	O
supporting	O
HTML5	B-Application
media	O
tags	O
.	O
</s>
<s>
Web	B-Language
Platform	I-Language
for	I-Language
Embedded	I-Language
(	O
WPE	O
)	O
is	O
a	O
WebKit	B-Language
port	O
designed	O
for	O
embedded	O
applications	O
;	O
it	O
further	O
improves	O
the	O
architecture	O
by	O
splitting	O
the	O
basic	O
rendering	O
functional	O
blocks	O
into	O
a	O
general-purpose	O
routines	O
library	B-Library
(	O
libwpe	O
)	O
,	O
platform	O
backends	O
,	O
and	O
engine	O
itself	O
(	O
called	O
WPE	O
WebKit	B-Language
)	O
.	O
</s>
<s>
The	O
GTK	B-Application
port	O
,	O
albeit	O
self-contained	O
,	O
can	O
be	O
built	O
to	O
use	O
these	O
base	O
libraries	O
instead	O
of	O
its	O
internal	O
platform	O
support	O
implementation	O
.	O
</s>
<s>
On	O
April	O
3	O
,	O
2013	O
,	O
Google	B-Application
announced	O
that	O
it	O
would	O
produce	O
a	O
fork	B-Application
of	O
WebKit	B-Language
's	O
WebCore	B-Language
component	O
,	O
to	O
be	O
named	O
Blink	B-Language
.	O
</s>
<s>
Chrome	B-Application
's	O
developers	O
decided	O
on	O
the	O
fork	B-Application
to	O
allow	O
greater	O
freedom	O
in	O
implementing	O
WebCore	B-Language
's	O
features	O
in	O
the	O
browser	O
without	O
causing	O
conflicts	O
upstream	O
,	O
and	O
to	O
allow	O
simplifying	O
its	O
codebase	O
by	O
removing	O
code	O
for	O
WebCore	B-Language
components	O
unused	O
by	O
Chrome	B-Application
.	O
</s>
<s>
In	O
relation	O
to	O
Opera	B-Application
Software	O
's	O
announcement	O
earlier	O
in	O
the	O
year	O
that	O
it	O
would	O
switch	O
to	O
WebKit	B-Language
by	O
means	O
of	O
the	O
Chromium	B-Language
codebase	O
,	O
it	O
was	O
confirmed	O
that	O
the	O
Opera	B-Application
web	I-Application
browser	I-Application
would	O
also	O
switch	O
to	O
Blink	B-Language
.	O
</s>
<s>
Following	O
the	O
announcement	O
,	O
WebKit	B-Language
developers	O
began	O
discussions	O
on	O
removing	O
Chrome-specific	O
code	O
from	O
the	O
engine	O
to	O
streamline	O
its	O
codebase	O
.	O
</s>
<s>
WebKit	B-Language
no	O
longer	O
has	O
any	O
Chrome	B-Application
specific	O
code	O
(	O
e.g.	O
,	O
buildsystem	O
,	O
V8	B-Language
JavaScript	I-Language
engine	I-Language
hooks	O
,	O
platform	O
code	O
,	O
etc	O
.	O
</s>
<s>
WebCore	B-Language
is	O
a	O
layout	O
,	O
rendering	O
,	O
and	O
Document	B-General_Concept
Object	I-General_Concept
Model	I-General_Concept
(	O
DOM	B-General_Concept
)	O
library	B-Library
for	O
HTML	O
and	O
Scalable	B-Application
Vector	I-Application
Graphics	I-Application
(	O
SVG	B-Application
)	O
,	O
developed	O
by	O
the	O
WebKit	B-Language
project	O
.	O
</s>
<s>
Its	O
full	O
source	O
code	O
is	O
licensed	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
.	O
</s>
<s>
The	O
WebKit	B-Language
framework	O
wraps	O
WebCore	B-Language
and	O
JavaScriptCore	O
,	O
providing	O
an	O
Objective-C	B-Language
application	B-Application
programming	I-Application
interface	I-Application
to	O
the	O
C++	B-Language
-based	O
WebCore	B-Language
rendering	O
engine	O
and	O
JavaScriptCore	O
script	O
engine	O
,	O
allowing	O
it	O
to	O
be	O
easily	O
referenced	O
by	O
applications	O
based	O
on	O
the	O
Cocoa	B-Operating_System
API	I-Operating_System
;	O
later	O
versions	O
also	O
include	O
a	O
cross-platform	B-Operating_System
C++	B-Language
platform	O
abstraction	O
,	O
and	O
various	O
ports	O
provide	O
more	O
APIs	B-Application
.	O
</s>
<s>
WebKit	B-Language
passes	O
the	O
Acid2	O
and	O
Acid3	O
tests	O
,	O
with	O
pixel-perfect	O
rendering	O
and	O
no	O
timing	O
or	O
smoothness	O
issues	O
on	O
reference	O
hardware	O
.	O
</s>
<s>
JavaScriptCore	O
is	O
a	O
framework	O
that	O
provides	O
a	O
JavaScript	B-Language
engine	I-Language
for	O
WebKit	B-Language
implementations	O
,	O
and	O
provides	O
this	O
type	O
of	O
scripting	O
in	O
other	O
contexts	O
within	O
macOS	B-Application
.	O
</s>
<s>
JavaScriptCore	O
is	O
originally	O
derived	O
from	O
KDE	B-Language
's	I-Language
JavaScript	I-Language
engine	I-Language
(	O
KJS	B-Language
)	O
library	B-Library
(	O
which	O
is	O
part	O
of	O
the	O
KDE	B-Application
project	O
)	O
and	O
the	O
PCRE	B-Language
regular	B-Language
expression	I-Language
library	B-Library
.	O
</s>
<s>
Since	O
forking	O
from	O
KJS	B-Language
and	O
PCRE	B-Language
,	O
JavaScriptCore	O
has	O
been	O
improved	O
with	O
many	O
new	O
features	O
and	O
greatly	O
improved	O
performance	O
.	O
</s>
<s>
On	O
June	O
2	O
,	O
2008	O
,	O
the	O
WebKit	B-Language
project	O
announced	O
they	O
rewrote	O
JavaScriptCore	O
as	O
"	O
SquirrelFish	O
"	O
,	O
a	O
bytecode	O
interpreter	B-Application
.	O
</s>
<s>
An	O
optimizing	O
just-in-time	O
(	O
JIT	O
)	O
compiler	B-Language
named	O
FTL	O
was	O
announced	O
on	O
May	O
13	O
,	O
2014	O
.	O
</s>
<s>
It	O
uses	O
LLVM	B-Application
to	O
generate	O
optimized	O
machine	B-Language
code	I-Language
.	O
</s>
<s>
"	O
FTL	O
"	O
stands	O
for	O
"	O
Fourth-Tier-LLVM	O
"	O
,	O
and	O
unofficially	O
for	O
faster-than-light	O
,	O
alluding	O
to	O
its	O
speed	O
.	O
</s>
