Screenshot of Microsoft Edge in Windows 10 showing the English Wikipedia main page rendered by EdgeHTML 17.
EdgeHTML Version 18.17746 / August 23, 2018
|Operating system||Windows 10|
EdgeHTML is a proprietary browser engine from Microsoft used in the Edge web browser. In December 2018, Microsoft announced that Edge is being rebuilt as a Chromium-based browser. Despite this, the engine is still maintained for applications using UWP.
Usage in Windows
EdgeHTML is a fork of Microsoft's Trident that was the engine of the Internet Explorer browser. It was first released as an experimental option in Internet Explorer 11 as part of the Windows 10 Technical Preview build 9879.
EdgeHTML is designed as a software component to allow software developers to easily add web browsing functionality to their own applications. It presents a COM interface for accessing and editing web pages in any COM-supported environment, like C++ and .NET. For instance, a web browser control can be added to a C++ program and EdgeHTML can then be used to access the page currently displayed in the web browser and retrieve element values. Events from the web browser control can also be captured. It is also used to render WinRT-apps that are based on web technologies.
|12.0||none||November 12, 2014||Initial version of EdgeHTML to be included as an experimental feature to Internet Explorer 11 to replace Trident 7.0 in next Project Spartan web browser, later renamed Microsoft Edge.|
|12.10049||0.10.10049||March 31, 2015||Introduced new features and came with the first version of Microsoft Edge.|
|12.10166||20.10166||July 9, 2015||
|12.10240||20.10240||July 15, 2015||Initial public release. Contains improvements to performance, support for HTML5 and CSS3.|
|12.10525||20.10525||August 18, 2015||This release contains initial groundwork for Object RTC in Microsoft Edge.|
|12.10532||20.10532||August 27, 2015||New features such as Pointer Lock (Mouse Lock), Canvas blending modes, and new input types.|
|13.10547||21.10547||September 18, 2015||Edge HTML has been updated to version 13, extended support for HTML5 and CSS3, Extended srcset (sizes), a[download] attribute, Canvas ellipse, SVG external content, WebRTC - Object RTC API (desktop).|
|13.10565||23.10565||October 12, 2015||CSS initial and unset values, initial support for docked F12 Developer Tools.|
|13.10586||25.10586||November 5, 2015||First public platform update, includes further enhancements to HTML5, including Object RTC support.|
|13.11099||27.11099||January 13, 2016||Initial foundational work for EdgeHTML 14.|
|14.14267||31.14267||February 18, 2016||Edge HTML has been updated to version 14, with initial plumbing for Web Notifications support.|
|14.14291||34.14291||March 17, 2016||Preview support for the VP9 video format on some devices.|
|14.14327||37.14327||April 20, 2016||Beacon interface and accessibility improvements.|
|14.14352||38.14352||May 26, 2016||H.264/AVC decoding became available through the ORTC API.|
|14.14356||38.14356||June 1, 2016||Various performance and reliability improvements and bug fixes.|
|14.14361||38.14361||June 8, 2016||TCP Fast Open is now disabled by default.|
|14.14366||38.14366||June 14, 2016||Fixed an issue that could result in abnormally high CPU usage when open to a page with many animated GIFs, as well as an issue resulting in certain captchas not displaying correctly.|
|14.14367||38.14367||June 16, 2016||Improvements to reduce battery usage on Windows 10 Mobile when Microsoft Edge is running in the background.|
|14.14376||38.14376||June 28, 2016||Bug fixes and performance improvements.|
|14.14393||38.14393||August 2, 2016||This is the stable channel release of EdgeHTML 14 with the Windows 10 Anniversary Update.|
|14.14901||39.14901||August 11, 2016||This release adds about:flags settings for several features in development, including support for WebRTC 1.0 and Service Worker features.|
|14.14915||39.14915||August 31, 2016||Partial implementation of Webkit-Text-Stroke and CSS outline-offset, partial support for WebRTC 1.0.|
|14.14926||39.14926||September 14, 2016||
|15.14942||39.14942||October 7, 2016||
EdgeHTML has been updated to version 15 with the following features :
|15.14959||39.14959||November 3, 2016||Bug fixes and reliability improvements.|
|15.14986||39.14986||December 7, 2016||Multiple new platform features and developer tools.|
|15.15063||40.15063||April 11, 2017||This is the stable channel release of EdgeHTML 15 with the Windows 10 Creators Update.|
|16.16299||41.16299||October 8, 2017||This is the stable channel release of EdgeHTML 16 part of the 2017 Fall Creators Update, having WebAssembly enabled by default.|
|17.17134||42.17134||April 30, 2018|
|18.17763||44.17763||November 13, 2018|
|18.18362||44.18362||May 21, 2019|
|18.18363||44.18363||November 12, 2019|
|18.19041||44.19041||May 27, 2020|
Microsoft first introduced the EdgeHTML rendering engine as part of Internet Explorer 11 in the Windows Technical Preview build 9879 on November 12, 2014. Microsoft planned to use EdgeHTML both in Internet Explorer and Project Spartan; in Internet Explorer it would exist alongside the Trident 7 engine from Internet Explorer 11, the latter being used for compatibility purposes. However, Microsoft decided to ship Internet Explorer 11 in Windows 10 as it was in Windows 8.1, leaving EdgeHTML only for the new Edge browser. EdgeHTML was also added to Windows 10 Mobile and the second Windows Server 2016 Technical Preview. It was officially released on July 29, 2015 as part of Windows 10.
Unlike Trident, EdgeHTML does not support ActiveX. It also drops support for the X-UA-Compatible header, used by Trident to determine in which version it had to render a certain page. Microsoft also dropped the usage of Compatibility View-lists. Edge will recognize if a page requires any of the removed technologies to run properly and suggest to the user to open the page in Internet Explorer instead. Another change was spoofing the user agent string, which claims to be Chrome and Safari, while also mentioning KHTML and Gecko, so that web servers that use user agent sniffing send Edge users the full versions of web pages instead of reduced-functionality pages.
|Microsoft EdgeHTML 12||Mozilla/5.0 (Windows NT 10.0;) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240|
|Internet Explorer 11||Mozilla/5.0 (Windows NT 10.0; Trident/7.0; rv:11.0) like Gecko|
Breaking from Trident, the new EdgeHTML engine will be focused on modern web standards and interoperability, rather than compatibility. The initial release of Edge HTML on Windows 10 included more than 4000 interoperability fixes.
On August 18, 2015, Microsoft released the first preview to EdgeHTML platform version 13 as part of Windows 10.0.10525, though it was still labeled as version 12. In subsequent updates, the support for HTML5 and CSS3 was extended to include new elements. Microsoft also included support for Object RTC and enabled ASM.js by default after it was added in version 12. The update's main focus was on improving the support for ECMAScript 6 and also including some features from ECMAScript 7. With that update to Chakra Edge provided to most extensive support for ECMAScript 6 according to the Kangax benchmark with 84% (and 90% with all flags enabled), 13% ahead of Mozilla Firefox 42, the then-current version of Firefox and runner-up.
EdgeHTML 13.10586 was released in multiple versions of Windows. On November 12, 2015, the New Xbox One Experience-update for the Xbox One included EdgeHTML 13.10586, replacing Internet Explorer 10 in the process. It was released to Windows 10 as part of the November Update on the same day. On November 18, 2015, the updated got rolled out to Windows 10 Mobile users in the Insider Preview. Finally, Microsoft rolled out the same update to Windows Server 2016 as part of Technical Preview 4.
On December 16, 2015, Microsoft released the first build of Redstone. In January and February 2016, 4 other builds followed, all laying the foundational work for EdgeHTML 14. On February 18, 2016, Microsoft released the first version of EdgeHTML 14 as version 14.14267. This version of the engine contained almost no changes in standards support yet, but contained fundamental work for Web Notifications, WebRTC 1.0, improved ECMAScript and CSS support and also contained a number of new flags. Further, Microsoft announced that it is working on VP9, WOFF 2.0, Web Speech API, WebM, FIDO 2.0, Beacon and many other technologies.
On April 30, 2018, EdgeHTML 17 was released to Windows 10 as part of the 2018 April Update (see version history), with features such as Muting tabs with a click, Automatic filling of forms and credit card details, better reading with annotations, grammar tools, and more.
Discontinuation in Edge
Edge was renamed Edge Legacy, when on January 15 2020, Microsoft released "Microsoft Edge Chromium", which on Windows Update can automatically be installed. Edge Legacy was hidden from the start menu, and attempts to launch Microsoft Edge Legacy/EdgeHTML failed. It is possible to run Edge Legacy and the new Edge browser side by side, but support for Edge Legacy ends on March 9, 2021. The Xbox One and Xbox Series X and Series S consoles still use Edge Legacy and EdgeHTML version 18.
EdgeHTML's rendering is meant to be fully compatible with the rendering of the Blink and WebKit layout engines, used by Google Chrome and Safari, respectively. Microsoft has stated that "any Edge-WebKit differences are bugs that we’re interested in fixing."
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