<s>
EdgeHTML	B-Application
is	O
a	O
proprietary	B-Application
browser	B-Protocol
engine	I-Protocol
from	O
Microsoft	O
that	O
was	O
formerly	O
used	O
in	O
Microsoft	B-Application
Edge	I-Application
,	O
which	O
debuted	O
in	O
2015	O
as	O
part	O
of	O
Windows	B-Operating_System
10	I-Operating_System
.	O
</s>
<s>
EdgeHTML	B-Application
is	O
a	O
fork	B-Application
of	O
the	O
MSHTML	B-Application
(	O
Trident	B-Application
)	O
engine	O
of	O
Internet	B-Application
Explorer	I-Application
.	O
</s>
<s>
It	O
is	O
designed	O
as	O
a	O
software	B-Architecture
component	I-Architecture
that	O
enables	O
developers	B-Application
to	O
easily	O
add	O
web	O
browsing	O
functionality	O
to	O
other	O
apps	B-Application
.	O
</s>
<s>
In	O
2018	O
,	O
Microsoft	O
began	O
rebuilding	O
Edge	O
as	O
a	O
Chromium-based	O
browser	O
,	O
which	O
meant	O
that	O
EdgeHTML	B-Application
would	O
no	O
longer	O
be	O
used	O
in	O
the	O
Edge	B-Application
browser	I-Application
.	O
</s>
<s>
Past	O
this	O
date	O
,	O
EdgeHTML	B-Application
does	O
,	O
however	O
,	O
continue	O
to	O
be	O
supported	O
and	O
widely	O
used	O
in	O
Universal	O
Windows	O
Platform	O
apps	B-Application
.	O
</s>
<s>
Microsoft	O
first	O
introduced	O
the	O
EdgeHTML	B-Application
rendering	O
engine	O
as	O
part	O
of	O
Internet	B-Application
Explorer	I-Application
11	I-Application
in	O
the	O
Windows	O
Technical	O
Preview	O
build	O
9879	O
on	O
November	O
12	O
,	O
2014	O
.	O
</s>
<s>
Microsoft	O
planned	O
to	O
use	O
EdgeHTML	B-Application
both	O
in	O
Internet	B-Application
Explorer	I-Application
and	O
Project	O
Spartan	O
;	O
in	O
Internet	B-Application
Explorer	I-Application
it	O
would	O
exist	O
alongside	O
the	O
Trident	B-Application
7	O
engine	O
from	O
Internet	B-Application
Explorer	I-Application
11	I-Application
,	O
the	O
latter	O
being	O
used	O
for	O
compatibility	O
purposes	O
.	O
</s>
<s>
However	O
,	O
Microsoft	O
decided	O
to	O
ship	O
Internet	B-Application
Explorer	I-Application
11	I-Application
in	O
Windows	B-Operating_System
10	I-Operating_System
as	O
it	O
was	O
in	O
Windows	B-Device
8.1	I-Device
,	O
leaving	O
EdgeHTML	B-Application
only	O
for	O
the	O
then	O
new	O
Edge	B-Application
browser	I-Application
.	O
</s>
<s>
EdgeHTML	B-Application
was	O
also	O
added	O
to	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
and	O
the	O
second	O
Windows	B-Device
Server	I-Device
2016	I-Device
Technical	O
Preview	O
.	O
</s>
<s>
It	O
was	O
officially	O
released	O
on	O
July	O
29	O
,	O
2015	O
,	O
as	O
part	O
of	O
Windows	B-Operating_System
10	I-Operating_System
.	O
</s>
<s>
Unlike	O
Trident	B-Application
,	O
EdgeHTML	B-Application
does	O
not	O
support	O
ActiveX	B-Application
.	O
</s>
<s>
It	O
also	O
drops	O
support	O
for	O
the	O
X-UA-Compatible	O
header	O
,	O
used	O
by	O
Trident	B-Application
to	O
determine	O
in	O
which	O
version	O
it	O
had	O
to	O
render	O
a	O
certain	O
page	O
.	O
</s>
<s>
Edge	O
will	O
recognize	O
if	O
a	O
page	O
requires	O
any	O
of	O
the	O
removed	O
technologies	O
to	O
run	O
properly	O
and	O
suggest	O
to	O
the	O
user	O
to	O
open	O
the	O
page	O
in	O
Internet	B-Application
Explorer	I-Application
instead	O
.	O
</s>
<s>
Another	O
change	O
was	O
spoofing	O
the	O
user	O
agent	O
string	O
,	O
which	O
claims	O
to	O
be	O
Chrome	B-Application
and	O
Safari	B-Application
,	O
while	O
also	O
mentioning	O
KHTML	B-Language
and	O
Gecko	B-Language
,	O
so	O
that	O
web	O
servers	O
that	O
use	O
user	O
agent	O
sniffing	O
send	O
Edge	O
users	O
the	O
full	O
versions	O
of	O
web	O
pages	O
instead	O
of	O
reduced-functionality	O
pages	O
.	O
</s>
<s>
EdgeHTML	B-Application
's	O
rendering	O
was	O
meant	O
to	O
be	O
fully	O
compatible	O
with	O
the	O
rendering	O
of	O
the	O
Blink	B-Language
and	O
WebKit	B-Language
layout	B-Protocol
engines	I-Protocol
,	O
used	O
by	O
Google	B-Application
Chrome	I-Application
and	O
Safari	B-Application
,	O
respectively	O
.	O
</s>
<s>
At	O
the	O
time	O
,	O
Microsoft	O
stated	O
that	O
"	O
any	O
Edge-WebKit	O
differences	O
are	O
bugs	O
that	O
we	O
’re	O
interested	O
in	O
fixing.	O
"	O
</s>
<s>
Breaking	O
from	O
Trident	B-Application
,	O
the	O
new	O
EdgeHTML	B-Application
engine	O
will	O
be	O
focused	O
on	O
modern	O
web	O
standards	O
and	O
interoperability	O
,	O
rather	O
than	O
compatibility	O
.	O
</s>
<s>
The	O
initial	O
release	O
of	O
EdgeHTML	B-Application
on	O
Windows	B-Operating_System
10	I-Operating_System
included	O
more	O
than	O
4000	O
interoperability	O
fixes	O
.	O
</s>
<s>
On	O
August	O
18	O
,	O
2015	O
,	O
Microsoft	O
released	O
the	O
first	O
preview	O
to	O
EdgeHTML	B-Application
platform	O
version	O
13	O
as	O
part	O
of	O
Windows	O
10.0.10525	O
,	O
though	O
it	O
was	O
still	O
labeled	O
as	O
version	O
12	O
.	O
</s>
<s>
EdgeHTML	B-Application
13.10586	O
was	O
released	O
in	O
multiple	O
versions	O
of	O
Windows	O
.	O
</s>
<s>
On	O
November	O
12	O
,	O
2015	O
,	O
the	O
New	O
Xbox	B-Device
One	I-Device
Experience-update	O
for	O
the	B-Device
Xbox	I-Device
One	I-Device
included	O
EdgeHTML	B-Application
13.10586	O
,	O
replacing	O
Internet	B-Application
Explorer	I-Application
10	I-Application
in	O
the	O
process	O
.	O
</s>
<s>
It	O
was	O
released	O
to	O
Windows	B-Operating_System
10	I-Operating_System
as	O
part	O
of	O
the	O
November	O
Update	O
on	O
the	O
same	O
day	O
.	O
</s>
<s>
On	O
November	O
18	O
,	O
2015	O
,	O
the	O
updated	O
got	O
rolled	O
out	O
to	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
users	O
in	O
the	O
Insider	O
Preview	O
.	O
</s>
<s>
Finally	O
,	O
Microsoft	O
rolled	O
out	O
the	O
same	O
update	O
to	O
Windows	B-Device
Server	I-Device
2016	I-Device
as	O
part	O
of	O
Technical	O
Preview	O
4	O
.	O
</s>
<s>
In	O
January	O
and	O
February	O
2016	O
,	O
4	O
other	O
builds	O
followed	O
,	O
all	O
laying	O
the	O
foundational	O
work	O
for	O
EdgeHTML	B-Application
14	O
.	O
</s>
<s>
On	O
February	O
18	O
,	O
2016	O
,	O
Microsoft	O
released	O
the	O
first	O
version	O
of	O
EdgeHTML	B-Application
14	O
as	O
version	O
14.14267	O
.	O
</s>
<s>
This	O
version	O
of	O
the	O
engine	O
contained	O
almost	O
no	O
changes	O
in	O
standards	O
support	O
yet	O
,	O
but	O
contained	O
fundamental	O
work	O
for	O
Web	O
Notifications	O
,	O
WebRTC	B-Protocol
1.0	I-Protocol
,	O
improved	O
ECMAScript	B-Language
and	O
CSS	O
support	O
and	O
also	O
contained	O
a	O
number	O
of	O
new	O
flags	O
.	O
</s>
<s>
Further	O
,	O
Microsoft	O
announced	O
that	O
it	O
was	O
working	O
on	O
VP9	B-Algorithm
,	O
WOFF	O
2.0	O
,	O
Web	O
Speech	O
API	O
,	O
WebM	B-Application
,	O
FIDO	O
2.0	O
,	O
and	O
Beacon	O
API	O
.	O
</s>
<s>
EdgeHTML	B-Application
versionRelease	O
dateNotes12.0November	O
12	O
,	O
2014Beta	O
version	O
that	O
was	O
part	O
of	O
a	O
special	O
Internet	B-Application
Explorer	I-Application
build12.10049March	O
31	O
,	O
2015Beta	O
is	O
now	O
part	O
of	O
the	O
Microsoft	B-Application
Edge	I-Application
browser12.10166July	O
9	O
,	O
201512.10240July	O
15	O
,	O
2015Initial	O
public	O
release	O
of	O
Microsoft	B-Application
Edge	I-Application
.	O
</s>
<s>
Contains	O
improvements	O
to	O
performance	O
,	O
support	O
for	O
HTML5	O
and	O
CSS3.12.10525August	O
18	O
,	O
2015This	O
release	O
contains	O
initial	O
groundwork	O
for	O
Object	O
RTC	O
in	O
Microsoft	O
Edge.12.10532August	O
27	O
,	O
2015New	O
features	O
such	O
as	O
Pointer	O
Lock	O
(	O
Mouse	O
Lock	O
)	O
,	O
Canvas	O
blending	O
modes	O
,	O
and	O
new	O
input	O
types.13.10547September	O
18	O
,	O
2015Edge	O
HTML	O
has	O
been	O
updated	O
to	O
version	O
13	O
,	O
extended	O
support	O
for	O
HTML5	O
and	O
CSS3	O
,	O
Extended	O
srcset	O
(	O
sizes	O
)	O
,	O
a[download]	O
attribute	O
,	O
Canvas	O
ellipse	O
,	O
SVG	O
external	O
content	O
,	O
WebRTC	B-Protocol
-	O
Object	O
RTC	O
API	O
(	O
desktop	O
)	O
.13.10565October	O
12	O
,	O
2015CSS	O
initial	O
and	O
unset	O
values	O
,	O
initial	O
support	O
for	O
docked	O
F12	O
Developer	B-Application
Tools.13.10586November	O
5	O
,	O
2015First	O
public	O
platform	O
update	O
,	O
includes	O
further	O
enhancements	O
to	O
HTML5	O
,	O
including	O
Object	O
RTC	O
support.13.11099January	O
13	O
,	O
201614.14267February	O
18	O
,	O
2016Initial	O
plumbing	O
for	O
Web	O
Notifications	O
support.14.14279March	O
4	O
,	O
201614.14291March	O
17	O
,	O
2016Preview	O
support	O
for	O
the	O
VP9	B-Algorithm
video	O
format	O
on	O
some	O
devices.14.14316April	O
6	O
,	O
2016new	O
Web	O
Platform	O
features14.14327April	O
20	O
,	O
2016Beacon	O
interface	O
and	O
accessibility	O
improvements.14.14342May	O
10	O
,	O
2016Web	O
Notifications	O
,	O
Beacon	O
and	O
Fetch	O
APIs	O
became	O
enabled	O
by	O
default	O
,	O
Performance	O
improvements	O
for	O
several	O
common	O
JavaScript	O
APIs.14.14352May	O
26	O
,	O
2016H.264/AVC	O
decoding	O
became	O
available	O
through	O
the	O
ORTC	O
API.14.14356June	O
1	O
,	O
2016Various	O
performance	O
and	O
reliability	O
improvements	O
and	O
bug	O
fixes.14.14361June	O
8	O
,	O
2016TCP	O
Fast	O
Open	O
is	O
now	O
disabled	O
by	O
default.14.14366June	O
14	O
,	O
2016Fixed	O
an	O
issue	O
that	O
could	O
result	O
in	O
abnormally	O
high	O
CPU	O
usage	O
when	O
open	O
to	O
a	O
page	O
with	O
many	O
animated	O
GIFs	O
,	O
as	O
well	O
as	O
an	O
issue	O
resulting	O
in	O
certain	O
captchas	O
not	O
displaying	O
correctly.14.14367June	O
16	O
,	O
2016Improvements	O
to	O
reduce	O
battery	O
usage	O
on	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
when	O
Microsoft	B-Application
Edge	I-Application
is	O
running	O
in	O
the	O
background.14.14376June	O
28	O
,	O
201614.14393August	O
2	O
,	O
201614.14901August	O
11	O
,	O
201614.14915August	O
31	O
,	O
2016Partial	O
implementation	O
of	O
Webkit-Text-Stroke	O
and	O
CSS	O
outline-offset	O
,	O
partial	O
support	O
for	O
WebRTC	B-Protocol
1.0.14.14926September	O
14	O
,	O
2016Improved	O
performance	O
on	O
websites	O
with	O
changes	O
to	O
large	O
numbers	O
of	O
HTML	O
Elements	O
containing	O
text	O
by	O
improving	O
spellchecker	O
efficiency	O
.	O
</s>
<s>
Addressed	O
the	O
largest	O
cause	O
of	O
reliability	O
issues	O
in	O
Insider	O
builds	O
of	O
Microsoft	B-Application
Edge	I-Application
,	O
which	O
should	O
improve	O
reliability	O
on	O
major	O
sites	O
such	O
as	O
Facebook	O
and	O
Outlook.15.14942October	O
7	O
,	O
2016Enabled	O
H.264/AVC	O
support	O
by	O
default	O
for	O
RTC	O
scenarios	O
.	O
</s>
