In recent times QA has expanded our automated cross-browser testing: we re-organized our builds, pointed the tests to beta labs wikis as well as test2wiki, and we've written a number of new tests. In the course of that a lot of our builds for Internet Explorer versions began to fail.
I've just cleaned up most of the build failures and discovered what I think are some interesting facts about support for older versions of Internet Explorer across the set of WMF features.
Not supported in IE6: AFTv5 by design VisualEditor by design UniversalLanguageSelector by design Interlanguage "Add links" feature known issue https://bugzilla.wikimedia.org/show_bug.cgi?id=49139 PageTriage by design PDF export broken: https://bugzilla.wikimedia.org/show_bug.cgi?id=49485 Page editing: degraded UI ACUX display garbled but functions, known issue
Not supported in IE7: VisualEditor by design UniversalLanguageSelector by design Interlanguage "Add links" feature known issue https://bugzilla.wikimedia.org/show_bug.cgi?id=49139 PageTriage by design PDF export broken: https://bugzilla.wikimedia.org/show_bug.cgi?id=49485
Not supported in IE8: VisualEditor by design UniversalLanguageSelector minor issue https://bugzilla.wikimedia.org/show_bug.cgi?id=49447 Interlanguage "Add links" feature known issue https://bugzilla.wikimedia.org/show_bug.cgi?id=49139
Not supported in IE9: AFTv5 broken for now https://bugzilla.wikimedia.org/show_bug.cgi?id=49445(AFTv5 has a history of IE9-only issues) VisualEditor broken for now https://bugzilla.wikimedia.org/show_bug.cgi?id=49187 Interlanguage "Add links" feature known issue https://bugzilla.wikimedia.org/show_bug.cgi?id=49139
One other interesting note: we have an effective test for GuidedTour (it has turned up regression bugs) that runs properly across all the browsers, so thanks E3 team.