<s>
The	O
blink	B-Application
element	I-Application
is	O
a	O
non-standard	O
HTML	B-General_Concept
element	I-General_Concept
that	O
indicates	O
to	O
a	O
user	B-Protocol
agent	I-Protocol
(	O
generally	O
a	O
web	B-Application
browser	I-Application
)	O
that	O
the	O
page	O
author	O
intends	O
the	O
content	O
of	O
the	O
element	O
to	O
blink	O
(	O
that	O
is	O
,	O
alternate	O
between	O
being	O
visible	O
and	O
invisible	O
)	O
.	O
</s>
<s>
The	O
element	O
was	O
introduced	O
in	O
Netscape	B-Protocol
Navigator	I-Protocol
but	O
is	O
no	O
longer	O
supported	O
and	O
often	O
ignored	O
by	O
modern	O
Web	B-Application
browsers	I-Application
;	O
some	O
,	O
such	O
as	O
Internet	B-Application
Explorer	I-Application
,	O
never	O
supported	O
the	O
element	O
at	O
all	O
.	O
</s>
<s>
Lou	O
Montulli	O
,	O
often	O
credited	O
as	O
the	O
inventor	O
of	O
the	O
blink	B-Application
element	I-Application
,	O
claims	O
he	O
only	O
suggested	O
the	O
idea	O
,	O
without	O
writing	O
any	O
actual	O
code	O
.	O
</s>
<s>
The	O
blink	B-Application
element	I-Application
is	O
non-standard	O
,	O
and	O
as	O
such	O
there	O
is	O
no	O
authoritative	O
specification	O
of	O
its	O
syntax	O
or	O
semantics	O
.	O
</s>
<s>
While	O
Bert	O
Bos	O
of	O
the	O
World	O
Wide	O
Web	O
Consortium	O
has	O
produced	O
a	O
Document	B-Language
Type	I-Language
Definition	I-Language
that	O
includes	O
syntax	O
for	O
the	O
blink	B-Application
element	I-Application
(	O
defining	O
it	O
as	O
a	O
phrase	O
element	O
on	O
a	O
par	O
with	O
elements	O
for	O
emphasis	O
and	O
citations	O
)	O
,	O
the	O
comments	O
in	O
the	O
DTD	O
explain	O
that	O
it	O
is	O
intended	O
as	O
a	O
joke	O
.	O
</s>
<s>
Syntax	O
of	O
the	O
blink	B-Application
element	I-Application
type	I-Application
is	O
identical	O
to	O
such	O
standard	O
HTML	B-Language
inline	O
elements	O
as	O
span	O
.	O
</s>
<s>
The	O
rate	O
of	O
blinking	O
is	O
browser-specific	O
,	O
and	O
the	O
tag	B-General_Concept
contains	O
no	O
parameters	O
or	O
means	O
to	O
adjust	O
the	O
rate	O
of	O
blinking	O
.	O
</s>
<s>
In	O
versions	O
of	O
Mozilla	B-Application
Firefox	I-Application
that	O
support	O
the	O
tag	B-General_Concept
,	O
the	O
text	O
alternates	O
between	O
being	O
visible	O
for	O
three	O
quarters	O
of	O
a	O
second	O
and	O
being	O
invisible	O
for	O
one	O
quarter	O
of	O
a	O
second	O
.	O
</s>
<s>
The	O
blink	B-Application
element	I-Application
type	I-Application
was	O
first	O
invented	O
for	O
Netscape	B-Protocol
Navigator	I-Protocol
and	O
was	O
supported	O
in	O
its	O
descendants	O
,	O
such	O
as	O
Mozilla	B-Application
Firefox	I-Application
(	O
except	O
for	O
the	O
Netscape	B-Protocol
6	I-Protocol
and	O
early	O
Mozilla	B-Language
suite	I-Language
browsers	I-Language
—	O
it	O
is	O
thus	O
also	O
absent	O
from	O
SeaMonkey	B-Language
,	O
which	O
descends	O
from	O
Mozilla	B-Language
suite	I-Language
)	O
;	O
it	O
was	O
removed	O
from	O
Firefox	B-Application
in	O
version	O
23	O
.	O
</s>
<s>
Microsoft	O
's	O
Internet	B-Application
Explorer	I-Application
and	O
WebKit	B-Language
(	O
the	O
browser	B-Application
engine	O
behind	O
Apple	B-Application
's	I-Application
Safari	I-Application
and	O
Google	B-Application
Chrome	I-Application
)	O
never	O
supported	O
it	O
,	O
even	O
in	O
its	O
CSS	B-Language
incarnation	O
.	O
</s>
<s>
It	O
was	O
also	O
supported	O
by	O
the	O
Opera	B-Application
Internet	I-Application
Browser	I-Application
,	O
but	O
support	O
ended	O
in	O
version	O
15	O
when	O
that	O
browser	B-Application
switched	O
to	O
a	O
WebKit-based	O
engine	O
.	O
</s>
<s>
Vivaldi	B-Language
,	O
despite	O
its	O
roots	O
as	O
a	O
spiritual	O
successor	O
to	O
the	O
Presto-based	O
Opera	B-Application
,	O
also	O
does	O
not	O
support	O
a	O
functional	O
blink	B-Application
tag	I-Application
.	O
</s>
<s>
Some	O
software	O
supports	O
the	O
blink	B-Application
element	I-Application
as	O
an	O
easter	O
egg	O
.	O
</s>
<s>
Google	B-Application
Search	I-Application
blinks	O
parts	O
of	O
the	O
page	O
when	O
one	O
searches	O
for	O
"	O
blink	O
html	B-Language
"	O
.	O
</s>
<s>
Android	B-Application
's	O
user	O
interface	O
framework	O
supports	O
the	O
blink	B-Application
tag	I-Application
,	O
labeling	O
it	O
as	O
TAG_1995	O
in	O
its	O
source	O
code	O
.	O
</s>
<s>
The	O
blink	O
value	O
of	O
the	O
CSS	B-Language
text-decoration	O
property	O
allows	O
authors	O
to	O
suggest	O
that	O
text	O
should	O
blink	O
without	O
using	O
proprietary	O
tags	B-General_Concept
,	O
but	O
the	O
CSS	B-Language
2.1	I-Language
Specification	O
states	O
that	O
"	O
conforming	O
user	B-Protocol
agents	I-Protocol
may	O
simply	O
not	O
blink	O
the	O
text	O
"	O
in	O
order	O
to	O
comply	O
with	O
the	O
User	B-Protocol
Agent	I-Protocol
Accessibility	O
Guidelines	O
.	O
</s>
<s>
The	O
blink	B-Application
element	I-Application
may	O
also	O
be	O
implemented	O
using	O
CSS	B-Application
animations	I-Application
.	O
</s>
<s>
Similar	O
effects	O
can	O
also	O
be	O
achieved	O
through	O
the	O
use	O
of	O
JavaScript	B-Language
.	O
</s>
<s>
Or	O
alternatively	O
,	O
the	O
blink	O
functionality	O
can	O
be	O
implemented	O
with	O
the	O
help	O
of	O
jQuery	B-Language
.	O
</s>
<s>
Even	O
before	O
the	O
implementing	O
of	O
the	O
blink	B-Application
tag	I-Application
in	O
HTML	B-Language
,	O
the	O
Apple	B-Device
IIe	I-Device
had	O
a	O
flashing	O
text	O
mode	O
,	O
alternating	O
between	O
standard	O
white-on-black	O
and	O
inverse	O
black-on-white	O
text	O
.	O
</s>
<s>
The	O
blink	B-Application
element	I-Application
has	O
been	O
consistently	O
criticised	O
by	O
usability	B-General_Concept
and	O
accessibility	O
experts	O
.	O
</s>
<s>
The	O
United	O
States	O
Federal	O
Government	O
's	O
Section	O
508	O
states	O
that	O
pages	O
should	O
avoid	O
causing	O
the	O
screen	O
to	O
flicker	O
with	O
a	O
frequency	O
between	O
2	O
Hz	O
and	O
55Hz	O
,	O
a	O
range	O
that	O
covers	O
rapidly	O
blinking	B-Application
text	I-Application
.	O
</s>
<s>
To	O
comply	O
with	O
the	O
User	B-Protocol
Agent	I-Protocol
Accessibility	O
Guidelines	O
a	O
user	B-Protocol
agent	I-Protocol
must	O
either	O
"	O
allow	O
configuration	O
to	O
render	O
animated	O
or	O
blinking	B-Application
text	I-Application
content	O
as	O
motionless	O
,	O
unblinking	O
text	O
"	O
or	O
never	O
blink	O
text	O
.	O
</s>
<s>
Mozilla	B-Application
Firefox	I-Application
satisfied	O
this	O
requirement	O
by	O
providing	O
a	O
hidden	O
configuration	O
option	O
to	O
disable	O
blinking	O
,	O
browser.blink_allowed	O
,	O
which	O
could	O
be	O
accessed	O
through	O
about:config	B-Protocol
.	O
</s>
