Consider merging https://chromium.googlesource.com/chromium/blink/+/20f42ed7623cc7366293ca610e6f40609185a591 On request error, fire events on the XMLHttpRequestUpload object before the XMLHttpRequest object as per the latest specification: http://xhr.spec.whatwg.org/#request-error IE10 behaves according to specification but blink was firing the events on the XMLHttpRequest object BEFORE the XMLHttpRequestUpload object in case of 'network error' or 'abort error'. Blink was however behaving according to specification in case of 'timeout error', which was inconsistent.
Created attachment 208607 [details] Patch
Comment on attachment 208607 [details] Patch Clearing flags on attachment: 208607 Committed r154004: <http://trac.webkit.org/changeset/154004>
All reviewed patches have been landed. Closing bug.