Qt's document is the best I have seen, http://doc.qt.io/qt-5/accessible-qwidget.html#introduction http://doc.qt.io/qt-5/accessible-qwidget.html#introduction I

Qt's document is the best I have seen, http://doc.qt.io/qt-5/accessible-qwidget.html#introduction http://doc.qt.io/qt-5/accessible-qwidget.html#introduction I think what made it awesome is 1. it has lots of examples 2. it used to be interactive, you can directly comment under the document page about unclear, inaccurate content. sadly, the recent document removed this feature.