<s>
Opera	B-Protocol
Mini	I-Protocol
is	O
a	O
mobile	B-Application
web	I-Application
browser	I-Application
made	O
by	O
Opera	B-Application
.	O
</s>
<s>
It	O
was	O
primarily	O
designed	O
for	O
the	O
Java	B-Language
ME	I-Language
platform	O
,	O
as	O
a	O
low-end	O
sibling	O
for	O
Opera	B-Language
Mobile	I-Language
,	O
but	O
it	O
is	O
now	O
developed	O
exclusively	O
for	O
Android	B-Application
.	O
</s>
<s>
It	O
was	O
previously	O
developed	O
for	O
iOS	B-Application
,	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
,	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
,	O
BlackBerry	B-Operating_System
,	O
Symbian	B-Operating_System
,	O
and	O
Bada	B-Operating_System
.	O
</s>
<s>
As	O
of	O
2022	O
,	O
the	O
Android	B-Application
build	O
is	O
the	O
only	O
version	O
still	O
under	O
active	O
development	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
was	O
derived	O
from	O
the	O
Opera	B-Application
web	I-Application
browser	I-Application
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
requests	O
web	O
pages	O
through	O
Opera	B-Application
Software	O
's	O
compression	O
proxy	B-Application
server	I-Application
.	O
</s>
<s>
The	O
compression	O
server	O
processes	O
and	O
compresses	O
requested	O
web	O
pages	O
before	O
sending	O
them	O
to	O
the	O
mobile	B-Application
phone	O
.	O
</s>
<s>
The	O
compression	B-General_Concept
ratio	I-General_Concept
is	O
90%	O
and	O
the	O
transfer	O
speed	O
is	O
increased	O
by	O
two	O
to	O
three	O
times	O
as	O
a	O
result	O
.	O
</s>
<s>
The	O
pre-processing	O
increases	O
compatibility	O
with	O
web	O
pages	O
not	O
designed	O
for	O
mobile	B-Application
phones	O
.	O
</s>
<s>
However	O
,	O
interactive	B-General_Concept
sites	O
which	O
depend	O
upon	O
the	O
device	O
processing	O
JavaScript	B-Language
do	O
not	O
work	O
properly	O
.	O
</s>
<s>
In	O
July	O
2012	O
,	O
Opera	B-Application
Software	O
reported	O
that	O
Opera	B-Protocol
Mini	I-Protocol
had	O
168.8	O
million	O
users	O
as	O
of	O
March	O
2012	O
.	O
</s>
<s>
In	O
February	O
2013	O
,	O
Opera	B-Application
reported	O
300	O
million	O
unique	O
Opera	B-Protocol
Mini	I-Protocol
active	O
users	O
and	O
150	O
billion	O
page	O
views	O
served	O
during	O
that	O
month	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
was	O
derived	O
from	O
the	O
Opera	B-Application
web	I-Application
browser	I-Application
for	O
personal	B-Device
computers	I-Device
,	O
which	O
has	O
been	O
publicly	O
available	O
since	O
1996	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
was	O
originally	O
intended	O
for	O
use	O
on	O
mobile	B-Application
phones	O
not	O
capable	O
of	O
running	O
a	O
conventional	O
Web	B-Application
browser	I-Application
.	O
</s>
<s>
After	O
the	O
final	O
version	O
was	O
launched	O
in	O
Germany	O
on	O
10	O
November	O
2005	O
,	O
and	O
quietly	O
released	O
to	O
all	O
countries	O
through	O
the	O
Opera	B-Protocol
Mini	I-Protocol
website	O
in	O
December	O
,	O
the	O
browser	B-Application
was	O
officially	O
launched	O
worldwide	O
on	O
24	O
January	O
2006	O
.	O
</s>
<s>
On	O
3	O
May	O
2006	O
,	O
Opera	B-Protocol
Mini	I-Protocol
2.0	O
was	O
released	O
.	O
</s>
<s>
It	O
included	O
new	O
features	O
such	O
as	O
the	O
ability	O
to	O
download	O
files	O
,	O
new	O
custom	O
skins	B-Application
,	O
more	O
search	B-Application
engine	I-Application
options	O
on	O
the	O
built-in	O
search	O
bar	O
,	O
a	O
speed	O
dial	O
option	O
,	O
new	O
search	B-Application
engines	I-Application
,	O
and	O
improved	O
navigation	O
.	O
</s>
<s>
On	O
1	O
November	O
2006	O
,	O
Opera	B-Protocol
Mini	I-Protocol
3	O
beta	O
introduced	O
secure	O
browsing	O
,	O
RSS	O
feeds	O
,	O
photo	O
uploading	O
and	O
content	O
folding	O
into	O
its	O
list	O
of	O
features	O
and	O
capabilities	O
.	O
</s>
<s>
A	O
second	O
beta	O
was	O
released	O
on	O
22	O
November	O
,	O
and	O
on	O
28	O
November	O
,	O
the	O
final	O
version	O
of	O
Opera	B-Protocol
Mini	I-Protocol
3	O
was	O
released	O
.	O
</s>
<s>
On	O
7	O
November	O
2007	O
,	O
Opera	B-Protocol
Mini	I-Protocol
4	O
was	O
released	O
.	O
</s>
<s>
According	O
to	O
Johan	O
Schön	O
,	O
technical	O
lead	O
of	O
Opera	B-Protocol
Mini	I-Protocol
development	O
,	O
the	O
entire	O
code	O
was	O
rewritten	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
4	O
includes	O
the	O
ability	O
to	O
view	O
web	O
pages	O
similarly	O
to	O
a	O
desktop	O
based	O
browser	B-Application
by	O
introducing	O
Overview	O
and	O
Zoom	O
functions	O
,	O
and	O
a	O
landscape	O
view	O
setting	O
.	O
</s>
<s>
Using	O
a	O
built-in	O
pointer	O
,	O
the	O
user	O
can	O
zoom	O
into	O
a	O
portion	O
of	O
the	O
page	O
to	O
provide	O
a	O
clearer	O
view	O
;	O
this	O
is	O
similar	O
to	O
the	O
functionality	O
of	O
Opera	B-Application
's	O
Nintendo-based	O
web	B-Application
browsers	I-Application
.	O
</s>
<s>
This	O
version	O
also	O
includes	O
the	O
ability	O
to	O
synchronise	O
with	O
Opera	B-Application
on	O
a	O
personal	B-Device
computer	I-Device
.	O
</s>
<s>
Prior	O
to	O
Opera	B-Protocol
Mini	I-Protocol
4	O
,	O
the	O
browser	B-Application
was	O
offered	O
in	O
two	O
editions	O
:	O
Opera	B-Protocol
Mini	I-Protocol
Advanced	O
for	O
high-memory	O
MIDP	B-Language
2	O
phones	O
,	O
and	O
Opera	B-Protocol
Mini	I-Protocol
Basic	O
for	O
low-memory	O
MIDP	B-Language
1	O
phones	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
4	O
replaced	O
Opera	B-Protocol
Mini	I-Protocol
Advanced	O
.	O
</s>
<s>
Originally	O
,	O
Google	B-Application
was	O
the	O
default	O
search	B-Application
engine	I-Application
on	O
Opera	B-Protocol
Mini	I-Protocol
.	O
</s>
<s>
On	O
8	O
January	O
2007	O
,	O
Opera	B-Application
Software	O
and	O
Yahoo	B-Application
!	I-Application
</s>
<s>
announced	O
a	O
partnership	O
to	O
make	O
Yahoo	B-Application
!	I-Application
</s>
<s>
On	O
27	O
February	O
2008	O
,	O
Opera	B-Application
Software	O
announced	O
that	O
Google	B-Application
would	O
henceforth	O
be	O
the	O
default	O
search	B-Application
engine	I-Application
for	O
Opera	B-Protocol
Mini	I-Protocol
and	O
Opera	B-Language
Mobile	I-Language
.	O
</s>
<s>
A	O
version	O
for	O
the	O
Android	B-Application
operating	I-Application
system	I-Application
was	O
announced	O
on	O
10	O
April	O
2008	O
.	O
</s>
<s>
Rather	O
than	O
port	O
the	O
code	O
to	O
Android	B-Application
,	O
a	O
wrapper	O
was	O
created	O
to	O
translate	O
Java	B-Language
ME	I-Language
API	O
calls	O
to	O
Android	B-Application
API	O
calls	O
.	O
</s>
<s>
On	O
16	O
August	O
2009	O
,	O
Opera	B-Application
Software	O
released	O
Opera	B-Protocol
Mini	I-Protocol
5.0	O
beta	O
,	O
which	O
included	O
tabbed	O
browsing	O
,	O
a	O
password	O
manager	O
,	O
improved	O
touch	O
screen	O
support	O
,	O
and	O
a	O
new	O
interface	O
,	O
with	O
a	O
visual	O
Speed	O
Dial	O
similar	O
to	O
the	O
one	O
introduced	O
by	O
Opera	B-Application
Software	O
in	O
their	O
desktop	O
browser	B-Application
.	O
</s>
<s>
The	O
browser	B-Application
's	O
use	O
of	O
compression	O
and	O
encrypted	O
proxy-based	O
technology	O
to	O
reduce	O
traffic	O
and	O
speed	O
page	O
display	O
has	O
the	O
side	O
effect	O
of	O
allowing	O
it	O
to	O
circumvent	O
several	O
approaches	O
to	O
Internet	B-Application
censorship	I-Application
.	O
</s>
<s>
Since	O
20	O
November	O
2009	O
,	O
there	O
have	O
been	O
reports	O
from	O
Chinese	O
users	O
that	O
when	O
they	O
use	O
Opera	B-Protocol
Mini	I-Protocol
,	O
they	O
are	O
redirected	O
to	O
an	O
error	O
page	O
leading	O
them	O
to	O
download	O
Opera	B-Protocol
Mini	I-Protocol
China	O
version	O
.	O
</s>
<s>
This	O
is	O
almost	O
certainly	O
due	O
to	O
the	O
Chinese	O
government	O
being	O
concerned	O
that	O
users	O
are	O
using	O
Opera	B-Protocol
Mini	I-Protocol
to	O
bypass	O
the	B-Application
Great	I-Application
Firewall	I-Application
of	I-Application
China	I-Application
.	O
</s>
<s>
Opera	B-Application
agreed	O
to	O
route	O
all	O
of	O
their	O
traffic	O
through	O
government	O
servers	O
.	O
</s>
<s>
In	O
2009	O
–	O
10	O
:	O
A	O
press	O
release	O
announcing	O
that	O
Indonesia	O
's	O
Smart	O
Telecom	O
had	O
chosen	O
Opera	B-Protocol
Mini	I-Protocol
for	O
their	O
devices	O
said	O
that	O
Opera	B-Protocol
Mini	I-Protocol
was	O
the	O
world	O
's	O
most	O
popular	O
mobile	B-Application
browser	I-Application
,	O
and	O
that	O
Russia	O
and	O
Indonesia	O
were	O
the	O
largest	O
users	O
.	O
</s>
<s>
An	O
iPhone	B-Device
version	O
was	O
approved	O
for	O
distribution	O
by	O
the	O
Apple	B-Application
App	I-Application
Store	I-Application
on	O
13	O
April	O
2010	O
.	O
</s>
<s>
On	O
3	O
September	O
2014	O
,	O
Opera	B-Application
started	O
taking	O
registrations	O
for	O
the	O
beta	O
version	O
of	O
Opera	B-Protocol
Mini	I-Protocol
for	O
Windows	B-Protocol
Phone	I-Protocol
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
was	O
released	O
for	O
Windows	B-Protocol
Phone	I-Protocol
six	O
days	O
later	O
,	O
on	O
9	O
September	O
2014	O
,	O
as	O
a	O
public	O
beta	O
.	O
</s>
<s>
This	O
marked	O
Opera	B-Application
's	O
return	O
to	O
Microsoft	O
's	O
mobile	B-Application
platform	I-Application
since	O
the	O
demise	O
of	O
Windows	O
Mobile	B-Application
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
uses	O
a	O
server	O
to	O
translate	O
HTML	O
,	O
CSS	B-Language
and	O
JavaScript	B-Language
into	O
a	O
more	O
compact	O
format	O
.	O
</s>
<s>
This	O
step	O
makes	O
Opera	B-Protocol
Mini	I-Protocol
fast	O
.	O
</s>
<s>
Most	O
Opera	B-Protocol
Mini	I-Protocol
versions	O
use	O
only	O
the	O
server-based	O
compression	O
method	O
,	O
with	O
maximal	O
compression	O
but	O
some	O
issues	O
with	O
interactive	B-General_Concept
web	B-Application
apps	I-Application
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
can	O
operate	O
in	O
three	O
compression	O
modes	O
:	O
"	O
mini	O
"	O
(	O
or	O
"	O
extreme	O
"	O
on	O
Android	B-Application
versions	O
)	O
,	O
"	O
turbo	O
"	O
(	O
or	O
"	O
high	O
"	O
on	O
Android	B-Application
versions	O
)	O
and	O
uncompressed	B-General_Concept
.	O
</s>
<s>
The	O
functionality	O
of	O
the	O
Mini	O
mode	O
is	O
somewhat	O
different	O
from	O
a	O
conventional	O
Web	B-Application
browser	I-Application
,	O
with	O
the	O
amount	O
of	O
data	O
which	O
has	O
to	O
be	O
transferred	O
much	O
reduced	O
,	O
but	O
with	O
some	O
loss	O
to	O
functionality	O
.	O
</s>
<s>
Unlike	O
straightforward	O
web	B-Application
browsers	I-Application
,	O
Opera	B-Protocol
Mini	I-Protocol
fetches	O
all	O
content	O
through	O
a	O
proxy	B-Application
server	I-Application
,	O
renders	O
it	O
using	O
the	O
Presto	B-Application
layout	I-Application
engine	I-Application
,	O
and	O
reformats	O
web	O
pages	O
into	O
a	O
format	O
more	O
suitable	O
for	O
small	O
screens	O
.	O
</s>
<s>
A	O
page	O
is	O
compressed	B-General_Concept
,	O
then	O
delivered	O
to	O
the	O
phone	O
in	O
a	O
markup	O
language	O
called	O
Opera	B-Protocol
Binary	I-Protocol
Markup	I-Protocol
Language	I-Protocol
(	O
OBML	B-Protocol
)	O
,	O
which	O
Opera	B-Protocol
Mini	I-Protocol
can	O
interpret	B-Application
.	O
</s>
<s>
According	O
to	O
Opera	B-Application
Software	O
,	O
the	O
data	B-General_Concept
compression	I-General_Concept
makes	O
transfer	O
time	O
about	O
two	O
to	O
three	O
times	O
faster	O
,	O
and	O
the	O
pre-processing	O
improves	O
the	O
display	O
of	O
web	O
pages	O
not	O
designed	O
for	O
small	O
screens	O
.	O
</s>
<s>
The	O
turbo	O
mode	O
was	O
added	O
later	O
and	O
is	O
similar	O
to	O
Mini	O
mode	O
but	O
bypasses	O
compression	O
for	O
interactive	B-General_Concept
functionality	O
,	O
at	O
the	O
expense	O
of	O
less	O
extreme	O
data	B-General_Concept
compression	I-General_Concept
.	O
</s>
<s>
The	O
turbo	O
and	O
uncompressed	B-General_Concept
modes	O
use	O
the	O
"	O
WebView	O
"	O
on	O
Android	B-Application
and	O
the	O
WebKit	B-Language
layout	B-Protocol
engine	I-Protocol
on	O
iOS	B-Application
.	O
</s>
<s>
The	O
Java	B-Language
ME	I-Language
and	O
Windows	B-Protocol
Phone	I-Protocol
versions	O
only	O
have	O
access	O
to	O
the	O
mini	O
compression	O
mode	O
.	O
</s>
<s>
Opera	B-Application
Software	O
claims	O
that	O
Opera	B-Protocol
Mini	I-Protocol
reduced	O
the	O
amount	O
of	O
data	O
transmitted	O
up	O
to	O
90%	O
in	O
the	O
mini	O
(	O
extreme	O
)	O
mode	O
;	O
in	O
turbo	O
(	O
high	O
)	O
mode	O
,	O
it	O
reduced	O
amount	O
up	O
to	O
60%	O
,	O
similar	O
to	O
Google	B-Application
Chrome	I-Application
's	O
Reduced	O
Data	O
mode	O
.	O
</s>
<s>
When	O
a	O
user	O
browses	O
the	O
web	O
using	O
Opera	B-Protocol
Mini	I-Protocol
,	O
the	O
request	O
is	O
sent	O
,	O
via	O
the	O
connectivity	O
available	O
at	O
that	O
moment	O
by	O
the	O
device	O
(	O
Mobile	B-Application
broadband	O
,	O
Wi-Fi	O
or	O
any	O
other	O
option	O
given	O
by	O
the	O
device	O
)	O
to	O
access	O
the	O
Internet	O
,	O
to	O
one	O
of	O
the	O
Opera	B-Application
Software	O
company	O
's	O
proxy	B-Application
servers	I-Application
,	O
which	O
retrieves	O
the	O
web	O
page	O
,	O
processes	O
and	O
compresses	O
it	O
,	O
and	O
sends	O
it	O
back	O
to	O
the	O
client	O
(	O
user	O
's	O
mobile	B-Application
phone	O
)	O
.	O
</s>
<s>
By	O
default	O
,	O
Opera	B-Protocol
Mini	I-Protocol
opens	O
one	O
connection	O
to	O
the	O
proxy	B-Application
servers	I-Application
,	O
which	O
it	O
keeps	O
open	O
and	O
re-uses	O
as	O
required	O
.	O
</s>
<s>
This	O
improves	O
transfer	O
speed	O
and	O
enables	O
the	O
servers	O
to	O
quickly	O
synchronize	O
changes	O
to	O
bookmarks	O
stored	O
in	O
Opera	B-Protocol
Mini	I-Protocol
server	O
.	O
</s>
<s>
When	O
the	O
Opera	B-Application
Software	O
company	O
launched	O
Opera	B-Protocol
Mini	I-Protocol
in	O
2006	O
,	O
they	O
had	O
over	O
100	O
Linux-based	O
proxy	B-Application
servers	I-Application
to	O
handle	O
Opera	B-Protocol
Mini	I-Protocol
traffic	O
.	O
</s>
<s>
From	O
16	O
March	O
2015	O
,	O
Opera	B-Protocol
Mini	I-Protocol
's	O
extreme	O
compression	O
mode	O
uses	O
an	O
upgraded	O
version	O
of	O
the	O
Presto	B-Application
layout	I-Application
engine	I-Application
that	O
is	O
included	O
in	O
Opera	B-Application
12	O
.	O
</s>
<s>
Consequently	O
,	O
Opera	B-Protocol
Mini	I-Protocol
supports	O
most	O
of	O
the	O
web	O
standards	O
supported	O
in	O
Opera	B-Application
12	O
.	O
</s>
<s>
Presto	B-Application
's	O
development	O
has	O
continued	O
for	O
Opera	B-Protocol
Mini	I-Protocol
and	O
further	O
support	O
was	O
added	O
for	O
HTML5	B-Application
input	O
types	O
,	O
CSS	B-Language
Flexbox	O
model	O
,	O
CSS	B-Language
rem	O
units	O
and	O
ECMAScript	O
5	O
.	O
</s>
<s>
However	O
,	O
unlike	O
the	O
desktop	O
edition	O
of	O
Opera	B-Application
,	O
frames	B-General_Concept
are	O
flattened	O
because	O
of	O
client	O
limitations	O
,	O
and	O
dotted	O
or	O
dashed	O
borders	O
are	O
displayed	O
as	O
solid	O
borders	O
due	O
to	O
bandwidth	O
and	O
memory	O
issues	O
.	O
</s>
<s>
As	O
Opera	B-Protocol
Mini	I-Protocol
reformats	O
web	O
pages	O
,	O
it	O
does	O
not	O
pass	O
the	O
Acid2	O
standards	O
compliance	O
test	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
supports	O
bi-directional	O
text	O
,	O
meaning	O
that	O
it	O
can	O
correctly	O
display	O
right-to-left	O
scripts	O
such	O
as	O
Arabic	O
and	O
Hebrew	O
in	O
addition	O
to	O
languages	O
written	O
left-to-right	O
.	O
</s>
<s>
Indic	B-General_Concept
and	O
Chinese	O
scripts	O
are	O
supported	O
only	O
if	O
an	O
appropriate	O
font	O
is	O
installed	O
on	O
the	O
device	O
as	O
the	O
default	O
system	O
font	O
.	O
</s>
<s>
For	O
devices	O
with	O
screens	O
128	O
pixels	B-Algorithm
wide	O
or	O
smaller	O
,	O
the	O
default	O
rendering	O
mode	O
is	O
Small-Screen	O
Rendering	O
(	O
SSR	O
)	O
.	O
</s>
<s>
Web	O
developers	O
can	O
turn	O
on	O
SSR	O
on	O
the	O
desktop	O
edition	O
of	O
Opera	B-Application
to	O
see	O
how	O
their	O
websites	O
will	O
be	O
displayed	O
on	O
mobile	B-Application
editions	O
of	O
Opera	B-Application
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
can	O
send	O
content	O
in	O
bitmap	O
image	O
form	O
if	O
a	O
font	O
required	O
is	O
not	O
available	O
on	O
the	O
device	O
,	O
which	O
is	O
useful	O
for	O
indic	B-General_Concept
scripts	O
.	O
</s>
<s>
When	O
browsing	O
the	O
Web	O
in	O
Opera	B-Protocol
Mini	I-Protocol
mode	O
,	O
JavaScript	B-Language
is	O
processed	O
by	O
the	O
proxy	B-Application
server	I-Application
,	O
and	O
is	O
merely	O
rendered	O
on	O
the	O
device	O
.	O
</s>
<s>
This	O
limits	O
interactivity	B-General_Concept
.	O
</s>
<s>
If	O
a	O
script	O
is	O
paused	O
(	O
on	O
the	O
server	O
)	O
,	O
the	O
browser	B-Application
must	O
communicate	O
with	O
the	O
server	O
to	O
unpause	O
it	O
.	O
</s>
<s>
JavaScript	B-Language
will	O
only	O
run	O
for	O
a	O
couple	O
of	O
seconds	O
on	O
the	O
Mini	O
server	O
before	O
pausing	O
,	O
due	O
to	O
resource	O
constraints	O
.	O
</s>
<s>
On	O
Opera	B-Protocol
Mini	I-Protocol
,	O
before	O
the	O
page	O
is	O
sent	O
to	O
the	O
mobile	B-Application
device	I-Application
,	O
its	O
onLoad	O
events	O
are	O
fired	O
and	O
all	O
scripts	O
are	O
allowed	O
a	O
maximum	O
of	O
two	O
seconds	O
to	O
execute	O
.	O
</s>
<s>
After	O
the	O
scripts	O
have	O
finished	O
or	O
the	O
timeout	O
is	O
reached	O
,	O
all	O
scripts	O
are	O
stopped	O
and	O
the	O
page	O
is	O
compressed	B-General_Concept
and	O
sent	O
to	O
the	O
mobile	B-Application
device	I-Application
.	O
</s>
<s>
When	O
one	O
of	O
these	O
events	O
is	O
triggered	O
,	O
it	O
sends	O
a	O
request	O
to	O
the	O
proxy	B-Application
server	I-Application
to	O
process	O
the	O
event	O
.	O
</s>
<s>
The	O
proxy	B-Application
server	I-Application
then	O
executes	O
the	O
JavaScript	B-Language
and	O
returns	O
the	O
revised	O
page	O
to	O
the	O
mobile	B-Application
device	I-Application
.	O
</s>
<s>
Pop-ups	O
,	O
if	O
not	O
blocked	O
by	O
the	O
JavaScript	B-Language
restrictions	O
,	O
replace	O
the	O
web	O
page	O
being	O
viewed	O
.	O
</s>
<s>
Opera	B-Application
has	O
published	O
Web	O
content	O
authoring	O
guidelines	O
to	O
assist	O
authors	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
can	O
run	O
in	O
Turbo	O
and	O
Uncompressed	B-General_Concept
modes	O
,	O
in	O
addition	O
to	O
Mini	O
mode	O
.	O
</s>
<s>
In	O
Turbo	O
mode	O
,	O
the	O
amount	O
of	O
data	O
transferred	O
is	O
still	O
much	O
reduced	O
by	O
compression	O
,	O
but	O
,	O
unlike	O
Mini	O
mode	O
,	O
JavaScript	B-Language
is	O
not	O
intercepted	O
by	O
the	O
server	O
and	O
works	O
properly	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
encrypts	O
the	O
connection	O
between	O
the	O
mobile	B-Application
device	I-Application
and	O
the	O
Opera	B-Application
proxy	B-Application
server	I-Application
for	O
security	O
.	O
</s>
<s>
it	O
also	O
supports	O
modern	O
secure	O
ciphers	O
like	O
AES-GCM	B-Algorithm
and	O
ECC	O
.	O
</s>
<s>
However	O
,	O
Opera	B-Protocol
Mini	I-Protocol
's	O
Extreme	O
mode	O
does	O
not	O
offer	O
true	O
end-to-end	B-Application
security	O
when	O
visiting	O
HTTPS	B-Protocol
encrypted	O
websites	O
only	O
for	O
data	O
saving	O
purpose	O
.	O
</s>
<s>
With	O
"	O
Extreme/Mini	O
mode	O
"	O
when	O
visiting	O
an	O
encrypted	O
web	O
page	O
,	O
first	O
the	O
Opera	B-Protocol
Mini	I-Protocol
's	O
servers	O
decrypt	O
the	O
page	O
,	O
compress	O
it	O
for	O
data	O
saving	O
then	O
re-encrypt	O
it	O
themselves	O
and	O
finally	O
forward	O
it	O
to	O
the	O
destination	O
phone	O
.	O
</s>
<s>
While	O
browsing	O
a	O
secured	O
site	O
with	O
"	O
High/Turbo	O
mode	O
"	O
or	O
"	O
Uncompressed	B-General_Concept
mode	O
"	O
the	O
connection	O
is	O
not	O
intercepted	O
by	O
the	O
Opera	B-Protocol
Mini	I-Protocol
server	O
.	O
</s>
<s>
That	O
means	O
High	O
mode	O
or	O
Uncompressed	B-General_Concept
mode	O
does	O
not	O
break	O
end-to-end	B-Application
integrity	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
uses	O
cloud	O
acceleration	O
and	O
data	B-General_Concept
compression	I-General_Concept
technology	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
servers	O
act	O
as	O
a	O
proxy	O
which	O
compresses	O
and	O
renders	O
the	O
data	O
of	O
web	O
pages	O
before	O
sending	O
it	O
to	O
users	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
supports	O
only	O
one	O
font	O
,	O
which	O
can	O
be	O
set	O
to	O
"	O
Small	O
"	O
,	O
"	O
Medium	O
"	O
,	O
or	O
"	O
Large	O
"	O
size	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
's	O
address	O
bar	O
is	O
capable	O
of	O
using	O
several	O
pre-configured	O
search	B-Application
engines	I-Application
.	O
</s>
<s>
The	O
user	O
can	O
add	O
more	O
search	B-Application
engines	I-Application
.	O
</s>
<s>
The	O
default	O
search	B-Application
engines	I-Application
are	O
Google	B-Application
and	O
Wikipedia	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
features	O
an	O
ad	O
blocker	O
.	O
</s>
<s>
When	O
activated	O
,	O
Opera	B-Protocol
Mini	I-Protocol
servers	O
try	O
to	O
filter	O
out	O
advertisement	O
before	O
rendering	O
the	O
page	O
and	O
sending	O
it	O
to	O
the	O
client	O
phone	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
features	O
an	O
AI-powered	O
news	B-Application
aggregator	I-Application
,	O
serving	O
personalised	O
news	O
,	O
night	O
mode	O
and	O
private	B-Protocol
browsing	I-Protocol
.	O
</s>
<s>
By	O
signed	O
into	O
an	O
Opera	B-Application
Account	O
;	O
Saved	O
Bookmarks	O
,	O
Speed	O
Dials	O
,	O
Opened	O
Tabs	O
could	O
be	O
backed-up	O
and	O
synchronized	O
between	O
different	O
phones	O
or	O
with	O
the	O
Opera	B-Application
browser	I-Application
on	O
computers	O
,	O
using	O
the	O
"	O
Opera	B-Application
Sync	O
"	O
service	O
.	O
</s>
<s>
The	O
overall	O
share	O
of	O
the	O
Opera	B-Application
family	O
in	O
the	O
mobile	B-Application
Web	I-Application
browser	I-Application
market	O
was	O
about	O
5.01	O
%	O
in	O
June	O
2018	O
.	O
</s>
<s>
Opera	B-Protocol
Mini	I-Protocol
relies	O
on	O
data	O
centers	O
processing	O
the	O
Web	O
page	O
before	O
sending	O
it	O
back	O
to	O
the	O
phone	O
in	O
a	O
compressed	B-General_Concept
binary	O
form	O
.	O
</s>
<s>
Opera	B-Application
Software	O
operates	O
data	O
centers	O
in	O
the	O
United	O
States	O
,	O
Norway	O
,	O
China	O
,	O
Korea	O
,	O
Poland	O
and	O
Iceland	O
.	O
</s>
<s>
Several	O
mobile	B-Application
network	O
companies	O
pre-install	O
Opera	B-Protocol
Mini	I-Protocol
on	O
their	O
mobile	B-Application
phones	O
,	O
including	O
Telenor	O
,	O
AT&T	O
,	O
Vodafone	O
,	O
T-Mobile	O
,	O
KDDI	O
,	O
Omnitel	O
,	O
Pannon	O
GSM	O
,	O
Telefónica	O
Móviles	O
de	O
España	O
and	O
TMN	O
.	O
</s>
<s>
The	O
following	O
devices	O
came	O
pre-installed	O
with	O
Opera	B-Protocol
Mini	I-Protocol
.	O
</s>
<s>
Some	O
listed	O
devices	O
only	O
included	O
Opera	B-Protocol
Mini	I-Protocol
when	O
bought	O
from	O
certain	O
network	O
operators	O
.	O
</s>
<s>
While	O
not	O
officially	O
supported	O
on	O
ChromeOS	B-Operating_System
,	O
Vlad	O
Filippov	O
published	O
a	O
guide	O
that	O
teaches	O
how	O
to	O
run	O
Opera	B-Protocol
Mini	I-Protocol
inside	O
the	O
Chromium	O
browser	B-Application
.	O
</s>
