I guess you could try searching the GWT issues to figure that out. Generally GWT only has minimum browser requirements as it assumes that future versions of existing browsers should generally not break existing GWT apps. Sometimes they do, then GWT gets a bug fix.--
Generally IE 11 might cause some trouble because it has a User-Agent string that causes GWT to choose the Gecko/FireFox permutation. Could be that GWT 2.6 has some issues with that. But I am surprised that Chrome / Firefox do not work.
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