<s>
WorldWideWeb	B-Language
(	O
later	O
renamed	O
Nexus	B-Protocol
to	O
avoid	O
confusion	O
between	O
the	O
software	O
and	O
the	O
World	O
Wide	O
Web	O
)	O
is	O
the	O
first	O
web	B-Application
browser	I-Application
and	O
web	B-General_Concept
page	I-General_Concept
editor	I-General_Concept
.	O
</s>
<s>
It	O
was	O
the	O
first	O
WYSIWYG	B-Application
HTML	B-General_Concept
editor	I-General_Concept
.	O
</s>
<s>
Some	O
of	O
the	O
code	O
still	O
resides	O
on	O
Tim	O
Berners-Lee	O
'	O
s	O
NeXT	B-Device
Computer	I-Device
in	O
the	O
CERN	O
museum	O
and	O
has	O
not	O
been	O
recovered	O
due	O
to	O
the	O
computer	O
's	O
status	O
as	O
a	O
historical	O
artifact	O
.	O
</s>
<s>
To	O
coincide	O
with	O
the	O
20th	O
anniversary	O
of	O
the	O
research	O
center	O
giving	O
the	O
web	O
to	O
the	O
world	O
,	O
a	O
project	O
began	O
in	O
2013	O
at	O
CERN	O
to	O
preserve	O
this	O
original	O
hardware	B-Architecture
and	O
software	O
associated	O
with	O
the	O
birth	O
of	O
the	O
Web	O
.	O
</s>
<s>
Tim	O
Berners-Lee	O
wrote	O
what	O
would	O
become	O
known	O
as	O
WorldWideWeb	B-Language
on	O
a	O
NeXT	B-Device
Computer	I-Device
during	O
the	O
second	O
half	O
of	O
1990	O
,	O
while	O
working	O
for	O
CERN	O
,	O
a	O
European	O
nuclear	O
research	O
agency	O
.	O
</s>
<s>
The	O
browser	B-Application
was	O
announced	O
on	O
the	O
newsgroups	B-Application
and	O
became	O
available	O
to	O
the	O
general	O
public	O
in	O
August	O
1991	O
.	O
</s>
<s>
By	O
this	O
time	O
,	O
several	O
others	O
,	O
including	O
Bernd	O
Pollermann	O
,	O
Robert	O
Cailliau	O
,	O
Jean-François	O
Groff	O
,	O
and	O
visiting	O
undergraduate	O
student	O
Nicola	O
Pellow	O
–	O
who	O
later	O
wrote	O
the	O
Line	B-Protocol
Mode	I-Protocol
Browser	I-Protocol
–	O
were	O
involved	O
in	O
the	O
project	O
.	O
</s>
<s>
Berners-Lee	O
considered	O
different	O
names	O
for	O
his	O
new	O
application	O
,	O
including	O
The	O
Mine	O
of	O
Information	O
and	O
The	O
Information	O
Mesh	O
,	O
before	O
publicly	O
launching	O
the	O
WorldWideWeb	B-Language
browser	B-Application
in	O
1991	O
.	O
</s>
<s>
When	O
a	O
new	O
version	O
was	O
released	O
in	O
1994	O
,	O
it	O
was	O
renamed	O
Nexus	B-Protocol
Browser	B-Application
,	O
in	O
order	O
to	O
differentiate	O
between	O
the	O
software	O
(	O
WorldWideWeb	B-Language
)	O
and	O
the	O
World	O
Wide	O
Web	O
.	O
</s>
<s>
The	O
team	O
created	O
so	O
called	O
"	O
passive	O
browsers	B-Application
"	O
which	O
do	O
not	O
have	O
the	O
ability	O
to	O
edit	O
because	O
it	O
was	O
hard	O
to	O
port	O
this	O
feature	O
from	O
the	O
NeXT	O
system	O
to	O
other	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
Porting	O
to	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
was	O
not	O
possible	O
as	O
nobody	O
on	O
the	O
team	O
had	O
experience	O
with	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
Berners-Lee	O
and	O
Groff	O
later	O
adapted	O
many	O
of	O
WorldWideWeb	B-Language
's	O
components	O
into	O
a	O
C	B-Language
programming	I-Language
language	I-Language
version	O
,	O
creating	O
the	O
libwww	B-Protocol
API	B-Application
.	O
</s>
<s>
A	O
number	O
of	O
early	O
browsers	B-Application
appeared	O
,	O
notably	O
ViolaWWW	B-Protocol
.	O
</s>
<s>
They	O
were	O
all	O
eclipsed	O
by	O
Mosaic	B-Application
in	O
terms	O
of	O
popularity	O
,	O
which	O
by	O
1993	O
had	O
replaced	O
the	O
WorldWideWeb	B-Language
program	O
.	O
</s>
<s>
HTML	B-Language
,	O
various	O
communication	O
protocols	O
)	O
.	O
</s>
<s>
On	O
30	O
April	O
1993	O
,	O
the	O
CERN	O
directorate	O
released	O
the	O
source	O
code	O
of	O
WorldWideWeb	B-Language
into	O
the	O
public	O
domain	O
.	O
</s>
<s>
Berners-Lee	O
initially	O
considered	O
releasing	O
it	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
,	O
but	O
after	O
hearing	O
rumors	O
that	O
companies	O
might	O
balk	O
at	O
the	O
concept	O
if	O
any	O
licensing	O
issues	O
were	O
involved	O
,	O
he	O
eventually	O
opted	O
to	O
release	O
it	O
into	O
the	O
public	O
domain	O
.	O
</s>
<s>
Since	O
WorldWideWeb	B-Language
was	O
developed	O
on	O
and	O
for	O
the	O
NeXTSTEP	B-Application
platform	O
,	O
the	O
program	O
uses	O
many	O
of	O
NeXTSTEP	B-Application
's	O
components	O
–	O
WorldWideWeb	B-Language
's	O
layout	B-Protocol
engine	I-Protocol
was	O
built	O
around	O
NeXTSTEP	B-Application
's	O
Text	O
class	O
.	O
</s>
<s>
WorldWideWeb	B-Language
is	O
capable	O
of	O
displaying	O
basic	O
style	O
sheets	O
,	O
downloading	O
and	O
opening	O
any	O
file	O
type	O
with	O
a	O
MIME	O
type	O
that	O
is	O
also	O
supported	O
by	O
the	O
NeXT	O
system	O
(	O
PostScript	B-Language
,	O
movies	O
,	O
and	O
sounds	O
)	O
,	O
browsing	O
newsgroups	B-Application
,	O
and	O
spellchecking	B-Application
.	O
</s>
<s>
In	O
earlier	O
versions	O
,	O
images	O
are	O
displayed	O
in	O
separate	O
windows	O
,	O
until	O
NeXTSTEP	B-Application
's	O
Text	O
class	O
gained	O
support	O
for	O
Image	O
objects	O
.	O
</s>
<s>
WorldWideWeb	B-Language
is	O
able	O
to	O
use	O
different	O
protocols	O
:	O
FTP	B-Protocol
,	O
HTTP	B-Protocol
,	O
NNTP	B-Protocol
,	O
and	O
local	O
files	O
.	O
</s>
<s>
The	O
browser	B-Application
is	O
also	O
a	O
WYSIWYG	B-Application
editor	I-Application
.	O
</s>
<s>
Editing	O
pages	O
remotely	O
is	O
not	O
possible	O
,	O
as	O
the	O
HTTP	B-Protocol
PUT	O
method	B-Language
had	O
not	O
yet	O
been	O
implemented	O
during	O
the	O
period	O
of	O
the	O
application	O
's	O
active	O
development	O
.	O
</s>
<s>
Files	O
can	O
be	O
edited	O
in	O
a	O
local	O
file	O
system	O
which	O
is	O
in	O
turn	O
served	O
onto	O
the	O
Web	O
by	O
an	O
HTTP	B-Protocol
server	O
.	O
</s>
<s>
WorldWideWeb	B-Language
's	O
navigation	O
panel	O
contains	O
Next	O
and	O
Previous	O
buttons	O
that	O
automatically	O
navigate	O
to	O
the	O
next	O
or	O
previous	O
link	O
on	O
the	O
last	O
page	O
visited	O
,	O
similar	O
to	O
Opera	B-Application
's	O
Rewind	O
and	O
Fast	O
Forward	O
buttons	O
,	O
or	O
HyperCard	B-Application
;	O
i.e.	O
,	O
if	O
one	O
navigated	O
to	O
a	O
page	O
from	O
a	O
table	O
of	O
links	O
,	O
the	O
Previous	O
button	O
would	O
cause	O
the	O
browser	B-Application
to	O
load	O
the	O
previous	O
page	O
linked	O
in	O
the	O
table	O
.	O
</s>
<s>
Many	O
still	O
do	O
,	O
but	O
the	O
user	O
interface	O
link-chaining	O
was	O
not	O
adopted	O
by	O
other	O
contemporary	O
browser	B-Application
writers	O
,	O
and	O
it	O
only	O
gained	O
popularity	O
later	O
.	O
</s>
<s>
An	O
equivalent	O
functionality	O
is	O
nowadays	O
provided	O
by	O
connecting	O
web	O
pages	O
with	O
explicit	O
navigation	O
buttons	O
repeated	O
on	O
each	O
webpage	O
among	O
those	O
links	O
,	O
or	O
with	O
typed	B-General_Concept
links	I-General_Concept
in	O
the	O
headers	O
of	O
the	O
page	O
.	O
</s>
<s>
WorldWideWeb	B-Language
does	O
not	O
have	O
features	O
like	O
bookmarks	O
,	O
but	O
a	O
similar	O
feature	O
was	O
presented	O
in	O
the	O
browser	B-Application
:	O
if	O
a	O
link	O
should	O
be	O
saved	O
for	O
later	O
use	O
linking	O
it	O
to	O
the	O
user	O
's	O
own	O
home	O
page	O
(	O
start	O
page	O
)	O
,	O
the	O
link	O
is	O
remembered	O
in	O
the	O
same	O
fashion	O
as	O
a	O
bookmark	O
.	O
</s>
<s>
The	O
ability	O
to	O
create	O
more	O
home	O
pages	O
was	O
implemented	O
,	O
similar	O
to	O
folders	O
in	O
the	O
actual	O
web	B-Application
browsers	I-Application
bookmarks	O
.	O
</s>
