The ISimpleTextSelection class can be used to add support
for the MSAA ISimpleTextSelection interface to an AccessibilityImplementation.
If an AccessibilityImplementation subclass implements the two getters in this class,
a screen reader such as JAWS can determine the text selection range by calling them.
The AccessibilityImplementation subclass does not have to formally declare that
it implements this interface;
you can simply declare getters for these two properties, as follows: