https://lists.w3.org/Archives/Public/public-webapps/2010AprJun/0309.html
Re: FileReader question about ProgressEvent from James Robinson on 2010-04-26...
from jamesfilereaderquestionprogresseventrobinson
https://api.dart.dev/stable/latest/dart-html/ApplicationCache/progressEvent-constant.html
progressEvent constant - ApplicationCache class - dart:html library - Dart API
API docs for the progressEvent constant from the ApplicationCache class, for the Dart programming language.
library apiprogresseventconstantclassdart