Blue Ocean does not work at all on IE 11 i.e. you get a blank white screen with "Loading..." in the top left corner.

A significant number of people/companies run Jenkins on IE. Support on IE11/Edge is important.

See the Browser Compatibility Matrix.

Tested on IE 11 ... totally broken i.e. failing to load the page due to a react-redux issue. It's fair to assume that if it's broken on IE 11, then it's also broken on earlier versions.

NOTE: You'll also need to add the babel polyfill i.e. reapply commit e4ce334. In fact, it might be better to add this polyfill explicitly for IE only. Adding it to the blueocean bundle bloats it unnecessarily for browsers that don't need it.