Note that IE8, 9 and 10 all go out of support on 12th January 2016. Officially that means we don’t support them for our UI’s either and we shouldn’t raise any new PR’s against them. It also means a lot of customers will be doing upgrades to 11.
Please make sure you all have IE11 installed (even if only on a VM) so you can test any customer reported issues.
If you’re not familiar with IE11 do please note that (in Windows 10 at least) it comes in 2 versions, a full-screen ‘app’ version and the desktop application. These are separate programs so any issues should be tested on both and PR’s should note whether it affects one or both.
In Windows 10 the default browser isn’t IE11, it is Microsoft Edge. While we don’t officially support it, we may see the need to support it in the future. Customers, however, may raise issues with Edge thinking that they’re running IE11, as it has the same icon, much the same feel and, as a I said, is the default. It’ll also (on Windows 10 install) become the default App for many file types including PDF’s and so on, so a lot of people may use it without even knowing they are doing so. In Edge there is a ‘…’ Icon in the top right and clicking on it will bring up a menu that includes the option ‘Open with Internet Explorer’ that opens the desktop version of IE11.
IE11 includes a good source viewing option (other than ‘View Source’). Right click somewhere and select ‘Inspect Element’ and you get a UI much the same as Firebug on Firefox or the ‘Inspect’ option when right-clicking in Chrome.
IE11 uses the Trident 7.0 layout engine, new to IE11, from version 6 in IE10. Edge uses EdgeHTML which is a separate engine and is faster than IE11, probably faster than Chrome or Firefox. So expect differences. Also, reading between the lines, expect to see EdgeHTML in IE someday or for IE itself to be deprecated for Edge.