If a widget(addon) is not compatible in IE10 and if that widget is used in the application, is it possible that it might affect the whole application and that the application might not get opened in IE10 after widgetset compilation ?
Just to add: It should only affect the addon but if for example you have some kind of layout addon which is not compatible with IE10 then the components inside it might not be displayed even if they are compatible.
Generally speaking. If it’s not compatible the addon doesn’t work properly. It depends how far the addon affects the other application to know whether it will affect something else.
There’s an easy fix to that though: Test the application with IE10 before deploying it to production