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IE, Chrome and Firefox all dispatch loadend when you call abort() when the readyState is LOADING.
Oooh, this is filed against the File API. I thought it was against XMLHttpRequest, but I already have this covered. :-)
Created attachment 1435 [details] Test Case This test case illustrates inconsistent behavior across browsers w.r.t. FileReader.abort(), notably that toggling based on readyState is not being followed in Fx. Fixing this spec bug may also result in a Fx bug. I'll add this test case to the Git repo for testcases as well.
Fixed spec. to always fire loadend