Internet Explorer 11

Internet Explorer 11 (IE11) is a version of Internet Explorer, a web browser, by Microsoft. It was officially released on 17 October 2013 for Windows 8.1 and on 7 November 2013 for Windows 7.

Changes
IE11 features redesigned developer tools, support for WebGL, enhanced scaling for high DPI screens, prerender and prefetch. IE11 supports SPDY on Windows 8.1 only. In addition, IE11 supports Full Screen and Orientation APIs, CSS Flexbox and border image support, JavaScript enhancements, DOM mutation observers, Web Cryptography API, video text track support, encrypted media support and an improved HTML editor.

Removed features

 * IE11 has deprecated, meaning that code that checks for its presence will not detect it, but code that actually uses it will continue to work. Additionally, the   proprietary API has been removed.
 * Quick Tabs (CTRL+Q)
 * Work Offline command removed from File menu
 * Drag and drop of selected content from IE to other programs like Word or WordPad
 * Use large icons for command buttons Group Policy setting no longer supported.
 * Ability to view all cookies at once via Developer Tools

Performance
In one review, IE11 scored better than Google Chrome 30 and Firefox 26 in 2 of 4 benchmarks (including WebKit's SunSpider test), tied for fastest in a 3rd benchmark, and was last in Google's V8 performance benchmark. As a result of the speed improvements, the reviewer said "if you switched to Chrome for speed alone, you're now using the wrong browser."

IE11 was also observed to use less memory with multiple tabs open than contemporary versions of Chrome and Firefox.

IE11 uses Transport Layer Security v1.2 as the default protocol for secure connections and deprecates RC4 cipher suite.

History
Though an internal build of IE11 was leaked on 25 March 2013, its first preview version was not formally released until June 2013, during the Build 2013 conference, along with the preview release of Windows Server 2012 R2 and Windows 8.1. On 25 July 2013, Microsoft released the developer preview of Internet Explorer 11 for Windows 7 and Windows Server 2008 R2.