<s>
In	O
the	O
context	O
of	O
a	O
web	B-Application
browser	I-Application
,	O
a	O
frame	O
is	O
a	O
part	O
of	O
a	O
web	O
page	O
or	O
browser	B-Application
window	O
which	O
displays	O
content	O
independent	O
of	O
its	O
container	O
,	O
with	O
the	O
ability	O
to	O
load	O
content	O
independently	O
.	O
</s>
<s>
The	O
HTML	B-Language
or	O
media	O
elements	O
in	O
a	O
frame	O
may	O
come	O
from	O
a	O
web	O
site	O
distinct	O
from	O
the	O
site	O
providing	O
the	O
enclosing	O
content	O
.	O
</s>
<s>
This	O
practice	O
,	O
known	O
as	O
framing	B-General_Concept
,	O
is	O
today	O
often	O
regarded	O
as	O
a	O
violation	O
of	O
same-origin	B-Protocol
policy	I-Protocol
.	O
</s>
<s>
In	O
HTML	B-Language
,	O
a	O
frameset	B-General_Concept
is	O
a	O
group	O
of	O
named	O
frames	O
to	O
which	O
web	O
pages	O
and	O
media	O
can	O
be	O
directed	O
;	O
an	O
iframe	O
provides	O
for	O
a	O
frame	O
to	O
be	O
placed	O
inside	O
the	O
body	O
of	O
a	O
document	O
.	O
</s>
<s>
Since	O
the	O
early	O
2000s	O
,	O
concern	O
for	O
usability	B-General_Concept
and	O
accessibility	O
has	O
motivated	O
diminished	O
use	O
of	O
framesets	B-General_Concept
and	O
the	O
HTML5	B-Application
standard	O
does	O
not	O
support	O
them	O
.	O
</s>
<s>
The	O
frames	O
in	O
HTML	B-Language
are	O
created	O
using	O
the	O
tag	O
pair	O
.	O
</s>
<s>
The	O
<frameset>	O
tag	O
is	O
a	O
container	O
tag	O
for	O
all	O
other	O
tags	O
that	O
are	O
used	O
to	O
create	O
frames	O
.	O
</s>
<s>
The	O
<frameset> tag replaces the <body> tag in frameset documents.The <frameset>	O
tag	O
defines	O
how	O
to	O
divide	O
the	O
window	O
into	O
frames	O
.	O
</s>
<s>
Each	O
frameset	B-General_Concept
defines	O
a	O
set	O
of	O
rows	O
or	O
columns	O
.	O
</s>
<s>
The	O
<noframes>	O
element	O
may	O
be	O
included	O
so	O
web	B-Application
browsers	I-Application
with	O
frames	O
disabled	O
(	O
or	O
browsers	B-Application
that	O
do	O
not	O
support	O
frames	O
)	O
can	O
display	O
something	O
to	O
the	O
user	O
,	O
as	O
in	O
this	O
example	O
:	O
</s>
<s>
Framesets	B-General_Concept
have	O
a	O
border	O
attribute	O
.	O
</s>
<s>
The	O
iframe	O
element	O
is	O
used	O
inline	O
within	O
a	O
normal	O
HTML	B-Language
body	O
,	O
and	O
defines	O
the	O
initial	O
content	O
and	O
name	O
similarly	O
to	O
the	O
frame	O
element	O
.	O
</s>
<s>
Any	O
text	O
inside	O
an	O
tag	O
pair	O
will	O
be	O
displayed	O
in	O
browsers	B-Application
that	O
do	O
not	O
understand	O
the	O
iframe	O
tag	O
.	O
</s>
<s>
Netscape	B-Protocol
Navigator	I-Protocol
2.0	O
introduced	O
the	O
elements	O
used	O
for	O
frames	O
in	O
March	O
1996	O
.	O
</s>
<s>
Other	O
browser	B-Application
vendors	O
such	O
as	O
Apple	O
with	O
Cyberdog	B-Protocol
followed	O
later	O
that	O
year	O
.	O
</s>
<s>
At	O
that	O
time	O
,	O
Netscape	O
proposed	O
frames	O
to	O
the	O
World	O
Wide	O
Web	O
Consortium	O
(	O
W3C	O
)	O
for	O
inclusion	O
in	O
the	O
HTML	B-Language
3.0	O
standard	O
.	O
</s>
<s>
Frames	O
were	O
used	O
to	O
display	O
and	O
navigate	O
early	O
online	O
magazines	O
and	O
web	B-Application
apps	I-Application
,	O
such	O
as	O
webmail	B-Protocol
services	O
and	O
web	B-Protocol
chat	I-Protocol
sites	I-Protocol
.	O
</s>
<s>
Frames	O
had	O
the	O
advantage	O
of	O
allowing	O
elements	O
to	O
be	O
displayed	O
sitewide	O
without	O
requiring	O
server	O
features	O
such	O
as	O
server-side	O
includes	O
or	O
CGI	B-Language
support	O
.	O
</s>
<s>
XHTML	B-Language
1.1	O
,	O
the	O
intended	O
successor	O
to	O
HTML	B-Language
4	O
,	O
removed	O
all	O
frames	O
.	O
</s>
<s>
XFrames	O
,	O
the	O
intended	O
eventual	O
replacement	O
,	O
provided	O
the	O
composite	O
URI	B-Protocol
to	O
address	O
a	O
populated	O
frameset	B-General_Concept
.	O
</s>
<s>
The	O
later	O
HTML5	B-Application
standard	O
removed	O
framesets	B-General_Concept
by	O
means	O
differing	O
from	O
XHTML	B-Language
.	O
</s>
<s>
By	O
allowing	O
content	O
to	O
be	O
loaded	O
and	O
navigated	O
independently	O
,	O
frames	O
offered	O
several	O
advantages	O
over	O
the	O
plain	O
HTML	B-Language
in	O
use	O
when	O
they	O
were	O
first	O
developed	O
:	O
</s>
<s>
If	O
an	O
item	O
needs	O
to	O
be	O
added	O
to	O
a	O
sidebar	O
navigation	O
menu	O
,	O
the	O
web	O
page	O
author	O
needs	O
to	O
change	O
only	O
one	O
web	O
page	O
file	O
,	O
whereas	O
each	O
individual	O
page	O
on	O
a	O
traditional	O
non-frameset	O
website	O
would	O
have	O
to	O
be	O
edited	O
if	O
the	O
sidebar	O
menu	O
appeared	O
on	O
all	O
of	O
them	O
.	O
</s>
<s>
The	O
practice	O
of	O
framing	B-General_Concept
HTML	B-Language
content	O
led	O
to	O
numerous	O
criticisms	O
,	O
most	O
centering	O
on	O
usability	B-General_Concept
and	O
accessibility	O
concerns	O
.	O
</s>
<s>
Browsers	B-Application
which	O
render	O
material	O
linearly	O
do	O
not	O
handle	O
frames	O
well	O
.	O
</s>
<s>
Framing	B-General_Concept
complicates	O
web	O
indexing	O
and	O
can	O
be	O
detrimental	O
to	O
search	O
engine	O
optimization	O
.	O
</s>
<s>
Users	O
usually	O
do	O
not	O
expect	O
browsers	B-Application
to	O
print	O
frames	O
the	O
way	O
they	O
do	O
.	O
</s>
<s>
External	O
links	O
on	O
web	O
pages	O
which	O
use	O
frames	O
may	O
cause	O
other	O
pages	O
to	O
appear	O
in	O
the	O
frameset	B-General_Concept
,	O
since	O
the	O
default	O
behaviour	O
for	O
a	O
link	O
is	O
to	O
load	O
in	O
the	O
current	O
frame	O
if	O
the	O
author	O
does	O
not	O
specify	O
otherwise	O
.	O
</s>
<s>
This	O
could	O
be	O
used	O
by	O
unscrupulous	O
webmasters	O
to	O
make	O
it	O
appear	O
as	O
though	O
content	O
from	O
another	O
site	O
was	O
actually	O
part	O
of	O
the	O
site	O
hosting	O
the	O
frameset	B-General_Concept
.	O
</s>
<s>
If	O
the	O
screen	O
resolution	O
or	O
browser	B-Application
window	O
size	O
is	O
too	O
low	O
then	O
each	O
frame	O
will	O
have	O
scroll	O
bars	O
which	O
can	O
look	O
messy	O
and	O
uses	O
up	O
already	O
limited	O
space	O
.	O
</s>
<s>
Such	O
behaviour	O
typically	O
resulted	O
more	O
from	O
bad	O
site	O
design	O
(	O
fixed	O
layouts	O
instead	O
of	O
fluid	O
layouts	O
)	O
,	O
whereby	O
not	O
all	O
frameset	B-General_Concept
features	O
were	O
put	O
into	O
proper	O
use.This	O
behaviour	O
could	O
be	O
mitigated	O
by	O
:	O
</s>
<s>
CGI	B-Language
and	O
web-oriented	O
scripting	B-Language
languages	I-Language
and	O
web	O
development	O
frameworks	O
such	O
as	O
PHP	B-Application
and	O
Active	B-General_Concept
Server	I-General_Concept
Pages	I-General_Concept
,	O
as	O
well	O
as	O
database-backed	O
Content	B-Protocol
Management	I-Protocol
Systems	I-Protocol
such	O
as	O
WordPress	B-Application
,	O
provided	O
much	O
richer	O
options	O
for	O
maintaining	O
content	O
and	O
providing	O
navigation	O
.	O
</s>
<s>
Client-side	O
scripting	O
and	O
Dynamic	B-General_Concept
HTML	I-General_Concept
allowed	O
parts	O
of	O
a	O
page	O
to	O
be	O
visually	O
replaced	O
based	O
on	O
a	O
user	O
's	O
actions	O
.	O
</s>
<s>
AJAX	B-Device
allowed	O
for	O
dynamic	O
display	O
within	O
a	O
page	O
of	O
content	O
even	O
when	O
it	O
needs	O
to	O
be	O
fetched	O
from	O
the	O
server	O
,	O
for	O
instance	O
based	O
on	O
the	O
logged	O
in	O
user	O
or	O
events	O
elsewhere	O
.	O
</s>
