<s>
The	O
Opera	B-Application
Show	I-Application
Format	I-Application
(	O
OSF	O
)	O
is	O
a	O
set	O
of	O
conventions	O
used	O
in	O
a	O
web	O
page	O
using	O
XHTML	B-Language
1.0	I-Language
Strict	O
and	O
CSS	B-Language
2.1	I-Language
.	O
</s>
<s>
It	O
is	O
designed	O
to	O
allow	O
presentations	B-Application
to	O
be	O
easily	O
created	O
with	O
web	O
authoring	O
tools	O
.	O
</s>
<s>
OSF	O
requires	O
that	O
a	O
number	O
of	O
meta	O
tags	B-General_Concept
be	O
present	O
,	O
including	O
version	O
,	O
generator	O
,	O
author	O
,	O
and	O
presdate	O
(	O
the	O
creation	O
or	O
presentation	O
date	O
)	O
.	O
</s>
<s>
The	O
entire	O
presentation	O
,	O
including	O
all	O
slides	O
and	O
images	O
(	O
in	O
data	B-Protocol
:	I-Protocol
URIs	I-Protocol
)	O
is	O
contained	O
in	O
a	O
single	O
file	O
.	O
</s>
<s>
The	O
look	O
of	O
all	O
slides	O
is	O
controlled	O
by	O
the	O
layout	O
section	O
,	O
contained	O
in	O
a	O
<div class="layout">	O
HTML	B-General_Concept
element	I-General_Concept
.	O
</s>
<s>
The	O
Slide	O
Show	O
(	O
S9	O
)	O
Ruby	O
gem	O
creates	O
OSF-compatible	O
presentations	B-Application
using	O
a	O
wiki-style	O
markup	O
language	O
.	O
</s>
<s>
Other	O
tools	O
include	O
the	O
Windows-based	O
QuickShow	O
,	O
and	O
the	O
Project	O
Velt	O
Opera	O
widget	O
.	O
</s>
