onExit is called whenever the application exits, i.e. when the app canvas should no longer be displayed and the loader/embedder code should take some action. Emscripten provides two callbacks which can be used here: - onExit, called when the app exits (but see EXIT_RUNTIME) - onAbort, called on abort errors. These map to the two cases Qt's onExit supports. onExit is not called when EXIT_RUNTIME is disabled, which means we don't need the special case for exit code 0. In addition call onExit on any exception. The second call to showUi() in html_shell.html is then not needed any more and we avoid duplicating the UI state handling in user code. Update the qtloader_integration test to handle changes in behavior (we no longer set the error text on exit). Use emscripten_force_exit() to simulate application exit - using this function makes Emscripten call onExit even when EXIT_RUNTIME is disabled. Pick-to: 6.6 Change-Id: I72b5463c1836e8d5054e594abbd304fbc67032b7 Reviewed-by: Piotr Wierciński <piotr.wiercinski@qt.io> Reviewed-by: Mikołaj Boc <Mikolaj.Boc@qt.io>