Added :mod:`tkinter` support for the Tk 9.1 accessibility API: the :attr:`~tkinter.Misc.accessible` property of widgets returns an :class:`~tkinter.Accessible` object whose attributes are exposed to assistive technologies such as screen readers and whose methods register custom widgets with the platform accessibility API, and the :meth:`~tkinter.Misc.tk_check_screenreader` method reports whether a screen reader is running.