From spec: http://www.w3.org/TR/FileAPI/#dfn-progress-event One progress event will fire when blob has been completely read into memory. Firefox, Opera and IE follows the spec. Webkit based browser doesn't do that, it only fires progress event at interval of 50ms. WebKit should add the behavior to make the conformance with the spec.
Created attachment 144217 [details] Patch
Comment on attachment 144217 [details] Patch Looks OK. Thanks for improving the conformance with the spec.
Comment on attachment 144217 [details] Patch Clearing flags on attachment: 144217 Committed r118622: <http://trac.webkit.org/changeset/118622>
All reviewed patches have been landed. Closing bug.