<s>
The	O
view-source	B-Protocol
URI	I-Protocol
scheme	I-Protocol
is	O
used	O
by	O
some	O
web	B-Application
browsers	I-Application
to	O
construct	O
URIs	B-Protocol
that	O
result	O
in	O
the	O
browser	B-Application
displaying	O
the	O
source	O
code	O
of	O
a	O
web	B-Language
page	O
or	O
other	O
web	B-Language
resource	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
URI	B-Protocol
view-source:https://example.com	O
should	O
show	O
the	O
source	O
of	O
the	O
page	O
located	O
at	O
https://example.com	O
.	O
</s>
<s>
In	O
the	O
early	O
internet	O
,	O
View	B-Protocol
Source	I-Protocol
helped	O
people	O
to	O
create	O
their	O
own	O
web	B-Language
pages	O
,	O
learning	O
by	O
example	O
.	O
</s>
<s>
On	O
25	O
May	O
2011	O
,	O
the	O
'	O
view-source	B-Protocol
'	O
URI	B-Protocol
scheme	O
was	O
officially	O
registered	O
with	O
IANA	O
per	O
RFC	O
4395	O
.	O
</s>
<s>
Firefox	B-Application
and	O
Internet	B-Application
Explorer	I-Application
both	O
supported	O
the	O
scheme	O
,	O
but	O
support	O
was	O
dropped	O
from	O
Internet	B-Application
Explorer	I-Application
in	O
Windows	O
XP	O
SP2	O
due	O
to	O
security	O
problems	O
.	O
</s>
<s>
Firefox	B-Application
also	O
suffered	O
a	O
similar	O
security	O
issue	O
(	O
by	O
combining	O
view-source	B-Protocol
and	O
javascript	O
URIs	B-Protocol
)	O
,	O
but	O
still	O
supported	O
it	O
in	O
Firefox	B-Application
1.5	O
after	O
being	O
fixed	O
.	O
</s>
<s>
In	O
2009	O
a	O
new	O
discovered	O
bug	O
was	O
fixed	O
in	O
Firefox	B-Language
3.0.9	I-Language
.	O
</s>
