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Hmmm. This kind of varies... it very much depends on the turntable and the record.
If you have a turntable with a lot of torque, and a record that is kind of warped into a concave way (facing upwards that is), then the slipmat will pretty much always move with the platter regardless of what the record is doing.
If you have a record that is not warped like that, or is warped like that but you're playing the other side, then it's more likely that the slipmat will move with the record, i.e. if you are cueing up and pushing the record back and forth, then the slipmat will move back and forth too.
It all depends on the relative amounts of friction between the record and the slipmat, and the platter and the slipmat. Generally, it is more likely that there is going to be more friction between the record and the slipmat (the plastic of the record against the paint on the slipmat) than on the slipmat against the platter (felt against bare metal), meaning that it is more likely for the slipmat to move with the record rather than with the platter.
Often though, you will get a bit of both... the record moves underneath the record when you're holding it still, but slower than the platter is moving. I suppose that's the best way to sort out this argument!  
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