Internet Explorer (formerly Microsoft Internet Explorer and Windows Internet Explorer, commonly abbreviated IE or MSIE) is a series of graphical web browsers developed by Microsoft and included in the Microsoft Windows line of operating systems, starting in 1995.
PDF.JS and IE9 doesn't play too well together and I wouldn't rely on it if you want to support IE 9. Some of the rendering features in PDF.JS are not well progressed enough to be useable in IE9 There are ways to get around this, you can use FlexPaper which can be used in combination with PDF.js and a HTML4 version for browsers without HTML5 support My DebugBar | IETester / ChangeLog Corrected bug in Open All window (IE9 was opened as IE8) 2010-05-30 : v0.4.4. Corrected IE9 launch bug (cf forum report) Corrected duplicate taskbar thumbnail bug (cf forum report) Added option to enable/disable windows 7 taskbar thumbnails per tab (enabled by default) IE9-Windows6.1-KB2618444-x86.msu File List - Nektra's Wiki Download Link: http://download.microsoft.com/download/6/6/2/6623496E-FBCF-4863-A9F1-4038449AD329/IE9-Windows6.1-KB2618444-x86.msu
Internet Explorer - Wikipedia
How to install the older Internet Explorer stuff on IE7 I go over the steps to give IE7 Final, IE8, IE9, IE10 and IE11 the old fashioned Internet Explorer documents and logos, icons, bitmaps, cursors, and avi video clip family, featured in IE4, IE5.x, IE6 and IE7 Beta 1 on Windows XP, Windows 2000, and Windows 9x. The steps shown in the video can also be used to give WMP11 and WMP12 on Windows Vista and later the classic Windows Media Player icons
Also, in the talk section Rehashing IE9 wiki, I have mentioned some benchmarks by Google, Mozilla, Apple, W3C, ECMA yada yada (Acid3 is a joke as compared to these official benchmarks). Those who believe *all* info should be published in the wiki to retain the neutrality, I believe they, would have no problems if I go for the comparison and
I had tested the view of the webpage using IE9 emulating the IE8 standard and the IE7 standard views of that page, and in both cases, the old standard views worked for playing the MP4 video file. And the IE9 compatibility mode also played that web page. But I forced the IE9 to revert back to the standard view in order to test a code that would Microsoft will end support for IE8, IE9, and IE10 | InfoWorld