how to check for the class fully?

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Hello I am using androids fully Kiosk browser that uses the chrome Webview. But some methods or functions from javascript dont work correctly like the window.print(). But you can use instead fully.print() for the fully Kiosk App. But if I use the Website on a normal browser, the class ‘fully’ obviously doesnt exist.

How can I check for such a class (or object, (what if even is that called?))?

So what I basically want to do, is to use window.print() whenever its possible and fully.print() whenever that is possible, but window.print() not. Maybe something with try and catch?

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