In google drive i found some buttons and labels are found to be inconsistent in cursors.
Are there commonly accepted conventions as to default cursors and pointer cursors in web and desktop applications?
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In desktop or web application the default cursor is always been a convention for a button, for example, in HTML the default cursor for the button object is the default setting: if you want a pointer, you have to specify it via CSS.
It's all about affordance: the button object has a strong affordance, the user knows that it's an interactive object and how it works, as you can read on the Microsoft's guidelines for developer:
"[...]command buttons already have a strong affordance, so they don't need a hand pointer. The hand pointer must mean "this target is a link" and nothing else."
Although it is a convention, it's actually common to use the hand pointer: StackExchange does it too.