<s>
KJS	B-Language
is	O
KDE	B-Application
's	O
ECMAScript-JavaScript	O
engine	O
that	O
was	O
originally	O
developed	O
for	O
the	O
KDE	B-Application
project	O
's	O
Konqueror	B-Application
web	O
browser	O
by	O
Harri	O
Porten	O
in	O
2000	O
.	O
</s>
<s>
On	O
June	O
13	O
,	O
2002	O
,	O
Maciej	O
Stachowiak	O
announced	O
on	O
a	O
mailing	O
list	O
that	O
Apple	O
was	O
releasing	O
JavaScriptCore	O
,	O
a	O
framework	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
that	O
was	O
based	O
on	O
KJS	B-Language
.	O
</s>
<s>
Through	O
the	O
WebKit	B-Language
project	O
,	O
JavaScriptCore	O
has	O
since	O
evolved	O
into	O
SquirrelFish	O
Extreme	O
,	O
a	O
JavaScript	B-Language
engine	I-Language
that	O
compiles	O
JavaScript	O
into	O
native	O
machine	O
code	O
.	O
</s>
