<s>
Trident	B-Application
(	O
also	O
known	O
as	O
MSHTML	B-Application
)	O
is	O
a	O
proprietary	B-Application
browser	B-Protocol
engine	I-Protocol
for	O
the	O
Microsoft	B-Application
Windows	I-Application
version	O
of	O
Internet	B-Application
Explorer	I-Application
,	O
developed	O
by	O
Microsoft	O
.	O
</s>
<s>
MSHTML	B-Application
debuted	O
with	O
the	O
release	O
of	O
Internet	B-Protocol
Explorer	I-Protocol
4	I-Protocol
in	O
1997	O
.	O
</s>
<s>
For	O
versions	O
7	B-Application
and	O
8	B-Application
of	O
Internet	B-Application
Explorer	I-Application
,	O
Microsoft	O
made	O
significant	O
changes	O
to	O
MSHTML	B-Application
's	O
layout	O
capabilities	O
to	O
improve	O
compliance	O
with	O
Web	O
standards	O
and	O
add	O
support	O
for	O
new	O
technologies	O
.	O
</s>
<s>
MSHTML	B-Application
will	O
continue	O
to	O
receive	O
security	O
updates	O
for	O
the	O
IE	O
mode	O
of	O
Microsoft	B-Application
Edge	I-Application
until	O
at	O
least	O
2029	O
.	O
</s>
<s>
MSHTML	B-Application
was	O
designed	O
as	O
a	O
software	B-Architecture
component	I-Architecture
to	O
allow	O
software	B-Application
developers	I-Application
to	O
easily	O
add	O
web	O
browsing	O
functionality	O
to	O
their	O
own	O
applications	O
.	O
</s>
<s>
It	O
presents	O
a	O
COM	B-Application
interface	O
for	O
accessing	O
and	O
editing	O
web	O
pages	O
in	O
any	O
COM-supported	O
environment	O
,	O
like	O
C++	B-Language
and	O
.NET	B-Application
.	O
</s>
<s>
For	O
instance	O
,	O
a	O
web	B-Application
browser	I-Application
control	O
can	O
be	O
added	O
to	O
a	O
C++	B-Language
program	I-Language
and	O
MSHTML	B-Application
can	O
then	O
be	O
used	O
to	O
access	O
the	O
page	O
currently	O
displayed	O
in	O
the	O
web	B-Application
browser	I-Application
and	O
retrieve	O
element	O
values	O
.	O
</s>
<s>
Events	O
from	O
the	O
web	B-Application
browser	I-Application
control	O
can	O
also	O
be	O
captured	O
.	O
</s>
<s>
MSHTML	B-Application
functionality	O
becomes	O
available	O
by	O
linking	O
the	O
file	O
to	O
the	O
software	O
project	O
.	O
</s>
<s>
MSHTML	B-Application
version	O
MSHTML.dll	O
version	O
Internet	B-Application
Explorer	I-Application
version	O
Internet	B-Application
Explorer	I-Application
Mobile	I-Application
version	O
Notes	O
No	O
version	O
4.0.x	O
4.0	B-Protocol
Initial	O
version	O
.	O
</s>
<s>
5.0.x	O
5.0	B-Protocol
Improved	O
CSS	B-Language
1	O
support	O
and	O
had	O
sweeping	O
changes	O
in	O
CSS	B-Language
2	I-Language
rendering	O
.	O
</s>
<s>
5.5.x	O
5.5	B-Protocol
Corrected	O
issues	O
with	O
CSS	B-Language
handling	O
.	O
</s>
<s>
6.0.x	O
6.0	B-Application
Corrected	O
the	O
box	B-Application
model	I-Application
and	O
added	O
quirks	B-General_Concept
mode	I-General_Concept
with	O
DTD	B-Language
switching	O
.	O
</s>
<s>
7.0.x	O
7.0	B-Application
Fixed	O
many	O
CSS	B-Language
rendering	O
issues	O
and	O
added	O
partial	O
PNG	O
alpha	O
support	O
.	O
</s>
<s>
6.0	B-Application
IEMobile	B-Application
6	O
combines	O
many	O
features	O
of	O
IE	B-Application
6	I-Application
,	O
7	B-Application
,	O
and	O
8	B-Application
.	O
</s>
<s>
3.1	O
7.0	B-Application
7.0	B-Application
Second	O
port	O
on	O
a	O
mobile	O
system	O
of	O
MSHTML	B-Application
.	O
</s>
<s>
IE	B-Application
Mobile	I-Application
version	O
for	O
Windows	O
Phone	O
7	B-Application
.	O
</s>
<s>
4.0	B-Protocol
8.0.x	O
8.0	B-Application
First	O
version	O
to	O
pass	O
the	O
Acid	O
2	O
test	O
.	O
</s>
<s>
Added	O
full	O
support	O
for	O
CSS	B-Language
2.1	I-Language
.	O
</s>
<s>
5.0	B-Protocol
9.0.x	O
9.0	B-Application
9.0	B-Application
Added	O
support	O
for	O
SVG	B-Application
,	O
XHTML	B-Language
,	O
HTML5	B-Application
,	O
and	O
CSS	B-Language
3	I-Language
.	O
</s>
<s>
Added	O
a	O
new	O
hardware-accelerated	O
JScript	B-Language
engine	O
named	O
Chakra	B-Language
.	O
</s>
<s>
Included	O
with	O
IE	B-Application
9	I-Application
Mobile	O
in	O
Windows	O
Phone	O
7.5	O
"	O
Mango	O
"	O
.	O
</s>
<s>
6.0	B-Application
10.0.x	O
10.0	B-Application
10.0	B-Application
More	O
support	O
for	O
CSS	B-Language
3	I-Language
,	O
HTML5	B-Application
and	O
ES5	O
.	O
</s>
<s>
Included	O
in	O
Windows	O
Phone	O
8	B-Application
.	O
</s>
<s>
Support	O
for	O
linear	O
gradient	O
CSS	B-Language
transitions	O
.	O
</s>
<s>
7.0	B-Application
11.0.x	O
11.0	B-Application
11.0	B-Application
Support	O
for	O
WebGL	B-Library
and	O
SPDY	B-Protocol
.	O
</s>
<s>
Improved	O
support	O
for	O
HTML5	B-Application
.	O
</s>
<s>
Included	O
in	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
.	O
</s>
<s>
All	O
versions	O
of	O
Internet	B-Application
Explorer	I-Application
for	O
Windows	O
from	O
4.0	B-Protocol
onwards	O
use	O
MSHTML	B-Application
,	O
and	O
it	O
is	O
also	O
used	O
by	O
various	O
other	O
web	B-Application
browsers	I-Application
and	O
software	B-Architecture
components	I-Architecture
(	O
see	O
Internet	B-Application
Explorer	I-Application
shells	I-Application
)	O
.	O
</s>
<s>
In	O
Windows	B-Device
98	I-Device
,	O
Windows	B-Device
Me	I-Device
,	O
and	O
Windows	B-Application
2000	I-Application
,	O
it	O
is	O
also	O
used	O
for	O
the	O
Windows	O
file	O
manager/shell	O
,	O
Windows	B-Protocol
Explorer	I-Protocol
.	O
</s>
<s>
The	O
Add/Remove	O
Programs	O
tool	O
in	O
Windows	B-Application
2000	I-Application
uses	O
MSHTML	B-Application
to	O
render	O
the	O
list	O
of	O
installed	O
programs	O
,	O
and	O
in	O
Windows	O
XP	O
it	O
is	O
also	O
used	O
for	O
the	O
User	O
Accounts	O
Control	O
Panel	O
,	O
which	O
is	O
an	O
HTML	B-Application
Application	I-Application
.	O
</s>
<s>
MSHTML	B-Application
,	O
however	O
,	O
was	O
not	O
used	O
by	O
Internet	B-Protocol
Explorer	I-Protocol
for	I-Protocol
Mac	I-Protocol
(	O
which	O
used	O
Tasman	B-Application
starting	O
with	O
version	O
5.0	B-Protocol
)	O
,	O
nor	O
by	O
the	O
early	O
versions	O
of	O
Internet	B-Application
Explorer	I-Application
Mobile	I-Application
.	O
</s>
<s>
Some	O
other	O
MSHTML-based	O
applications	O
include	O
:	O
</s>
<s>
IE	B-Operating_System
Tab	I-Operating_System
,	O
a	O
Firefox	B-Application
and	O
Google	B-Application
Chrome	I-Application
add-on	O
used	O
to	O
render	O
pages	O
with	O
MSHTML	B-Application
within	O
the	O
Firefox	B-Application
or	O
Chrome	B-Application
user	O
interface	O
.	O
</s>
<s>
Pyjs	B-Language
,	O
a	O
python	O
Widget	O
set	O
Toolkit	O
.	O
</s>
<s>
Embedding	O
IWebBrowser2	B-Application
as	O
an	O
Active-X	B-Application
component	O
and	O
accessing	O
the	O
COM	B-Application
interface	O
,	O
Pyjs	B-Language
uses	O
MSHTML	B-Application
for	O
the	O
Desktop	O
version	O
,	O
through	O
the	O
python	O
win32	O
"	O
comtypes	O
"	O
library	O
.	O
</s>
<s>
Valve	O
's	O
Steam	B-Application
client	I-Application
,	O
previous	O
versions	O
of	O
which	O
used	O
MSHTML	B-Application
to	O
render	O
the	O
"	O
Store	O
"	O
,	O
"	O
Update	O
News	O
"	O
and	O
"	O
Community	O
"	O
sections	O
as	O
well	O
as	O
the	O
Steam	B-Application
in-game	O
browser	B-Application
and	O
MOTD	B-Operating_System
screens	O
in	O
Valve	O
games	O
.	O
</s>
<s>
The	O
Steam	B-Application
client	I-Application
was	O
updated	O
to	O
use	O
WebKit	B-Language
instead	O
of	O
MSHTML	B-Application
for	O
these	O
features	O
.	O
</s>
<s>
Then	O
was	O
updated	O
further	O
to	O
use	O
the	O
Chromium	B-Language
Embedded	I-Language
Framework	I-Language
.	O
</s>
<s>
WinRAR	B-Application
,	O
A	O
decompression	O
program	O
.	O
</s>
<s>
Current	O
versions	O
of	O
MSHTML	B-Application
,	O
as	O
of	O
Internet	B-Application
Explorer	I-Application
9	I-Application
have	O
introduced	O
support	O
for	O
CSS	B-Language
3	I-Language
,	O
HTML5	B-Application
,	O
and	O
SVG	B-Application
,	O
as	O
well	O
as	O
other	O
modern	O
web	O
standards	O
.	O
</s>
<s>
Web	O
standards	O
compliance	O
was	O
gradually	O
improved	O
with	O
the	O
evolution	O
of	O
MSHTML	B-Application
.	O
</s>
<s>
Although	O
each	O
version	O
of	O
IE	O
has	O
improved	O
standards	O
support	O
,	O
including	O
the	O
introduction	O
of	O
a	O
"	O
standards-compliant	O
mode	O
"	O
in	O
version	B-Application
6	I-Application
,	O
the	O
core	O
standards	O
that	O
are	O
used	O
to	O
build	O
web	O
pages	O
(	O
HTML	O
and	O
CSS	B-Language
)	O
were	O
sometimes	O
implemented	O
in	O
an	O
incomplete	O
fashion	O
.	O
</s>
<s>
For	O
example	O
,	O
there	O
was	O
no	O
support	O
for	O
the	O
<abbr>	O
element	O
which	O
is	O
part	O
of	O
the	O
HTML	O
4.01	O
standard	O
prior	O
to	O
IE	B-Application
8	I-Application
.	O
</s>
<s>
There	O
were	O
also	O
some	O
CSS	B-Language
attributes	O
missing	O
from	O
MSHTML	B-Application
,	O
like	O
min-height	O
,	O
etc	O
.	O
</s>
<s>
as	O
of	O
IE	B-Application
6	I-Application
.	O
</s>
<s>
As	O
of	O
Internet	B-Application
Explorer	I-Application
8	I-Application
CSS	B-Language
2.1	I-Language
is	O
fully	O
supported	O
as	O
well	O
as	O
some	O
CSS	O
3.0	O
attributes	O
.	O
</s>
<s>
Still	O
,	O
HTML	O
rendering	O
differences	O
between	O
standards-compliant	O
browsers	B-Application
are	O
not	O
yet	O
completely	O
resolved	O
.	O
</s>
<s>
Apart	O
from	O
MSHTML	B-Application
,	O
Microsoft	O
also	O
has	O
and	O
uses	O
several	O
other	O
layout	B-Protocol
engines	I-Protocol
.	O
</s>
<s>
One	O
of	O
them	O
,	O
known	O
as	O
Tasman	B-Application
,	O
was	O
used	O
in	O
Internet	B-Protocol
Explorer	I-Protocol
5	I-Protocol
for	O
Mac	O
.	O
</s>
<s>
Development	O
of	O
Internet	B-Protocol
Explorer	I-Protocol
for	I-Protocol
Mac	I-Protocol
was	O
halted	O
in	O
roughly	O
2003	O
,	O
but	O
development	O
of	O
Tasman	B-Application
continued	O
to	O
a	O
limited	O
extent	O
,	O
and	O
was	O
later	O
included	O
in	O
Office	B-Operating_System
2004	I-Operating_System
for	I-Operating_System
Mac	I-Operating_System
.	O
</s>
<s>
Office	B-Operating_System
for	I-Operating_System
Mac	I-Operating_System
2011	I-Operating_System
uses	O
the	O
open	O
source	O
WebKit	B-Language
engine	O
.	O
</s>
<s>
Microsoft	O
's	O
now	O
defunct	O
web	O
design	O
product	O
,	O
Expression	B-Application
Web	I-Application
as	O
well	O
as	O
Visual	B-Application
Studio	I-Application
2008	I-Application
and	O
later	O
do	O
not	O
use	O
Internet	B-Application
Explorer	I-Application
's	O
MSHTML	B-Application
engine	O
,	O
but	O
rather	O
a	O
different	O
engine	O
.	O
</s>
<s>
In	O
2014	O
,	O
MSHTML	B-Application
was	O
forked	B-Application
to	O
create	O
the	O
engine	O
EdgeHTML	B-Application
for	O
Microsoft	B-Application
Edge	I-Application
on	O
Windows	B-Operating_System
10	I-Operating_System
.	O
</s>
<s>
The	O
new	O
engine	O
is	O
"	O
designed	O
for	O
interoperability	O
with	O
the	O
modern	O
web	O
"	O
and	O
deprecates	O
or	O
removes	O
a	O
number	O
of	O
legacy	O
components	O
and	O
behaviors	O
,	O
including	O
document	O
modes	O
,	O
ensuring	O
that	O
pure	O
,	O
standards-compliant	O
HTML	O
will	O
render	O
properly	O
in	O
browsers	B-Application
without	O
the	O
need	O
for	O
special	O
considerations	O
by	O
web	O
developers	B-Application
.	O
</s>
<s>
This	O
resulted	O
in	O
a	O
completely	O
new	O
browser	B-Application
called	O
Microsoft	B-Application
Edge	I-Application
(	O
now	O
referred	O
to	O
as	O
"	O
Microsoft	B-Application
Edge	I-Application
Legacy	O
"	O
)	O
,	O
which	O
replaced	O
Internet	B-Application
Explorer	I-Application
as	O
a	O
stock	O
browser	B-Application
of	O
Windows	O
and	O
a	O
base	O
of	O
Microsoft	O
's	O
web	O
related	O
services	O
until	O
its	O
replacement	O
with	O
a	O
Blink	B-Language
and	O
Chromium	B-Language
based	O
Microsoft	B-Application
Edge	I-Application
in	O
late	O
2020	O
.	O
</s>
