<s>
hCalendar	B-General_Concept
(	O
short	O
for	O
HTML	B-Language
iCalendar	O
)	O
is	O
a	O
microformat	B-General_Concept
standard	O
for	O
displaying	O
a	O
semantic	O
(	O
X	O
)	O
HTML	B-Language
representation	O
of	O
iCalendar-format	O
calendar	B-Application
information	O
about	O
an	O
event	O
,	O
on	O
web	O
pages	O
,	O
using	O
HTML	B-Language
classes	O
and	O
rel	B-General_Concept
attributes	I-General_Concept
.	O
</s>
<s>
It	O
allows	O
parsing	O
tools	O
(	O
for	O
example	O
other	O
websites	O
,	O
or	O
browser	O
add-ons	O
like	O
Firefox	B-Application
's	O
Operator	B-Operating_System
extension	I-Operating_System
)	O
to	O
extract	O
the	O
details	O
of	O
the	O
event	O
,	O
and	O
display	O
them	O
using	O
some	O
other	O
website	O
,	O
index	O
or	O
search	O
them	O
,	O
or	O
to	O
load	O
them	O
into	O
a	O
calendar	B-Application
or	O
diary	O
program	O
,	O
for	O
instance	O
.	O
</s>
<s>
The	O
HTML	B-Language
mark-up	O
might	O
be	O
:	O
</s>
<s>
hCalendar	B-General_Concept
mark-up	O
may	O
be	O
added	O
using	O
span	O
HTML	B-General_Concept
elements	I-General_Concept
and	O
the	O
classes	O
vevent	B-General_Concept
,	O
summary	O
,	O
dtstart	O
(	O
start	O
date	O
)	O
,	O
dtend	O
(	O
end	O
date	O
)	O
,	O
location	O
and	O
url	O
:	O
</s>
<s>
The	O
newer	O
microformat	B-General_Concept
therefore	O
uses	O
the	O
HTML5	B-Application
element	O
time	O
instead	O
:	O
</s>
<s>
The	O
Geo	B-General_Concept
microformat	I-General_Concept
is	O
a	O
part	O
of	O
the	O
hCalendar	B-General_Concept
specification	O
,	O
and	O
is	O
often	O
used	O
to	O
include	O
the	O
coordinates	O
of	O
the	O
event	O
's	O
location	O
within	O
an	O
hCalendar	B-General_Concept
.	O
</s>
<s>
Notable	O
organisations	O
and	O
other	O
websites	O
using	O
hCalendar	B-General_Concept
include	O
:	O
</s>
<s>
Yahoo	O
!,	O
on	O
Yahoo	B-Application
!	I-Application
</s>
