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SN74AVC4T245: What happens if VCCA rail is not present but device is enable

Part Number: SN74AVC4T245

Hello, 

In our scenerio, it may be possible that, VCCA supply is not present and VCCB supply is present. Also OEn is enabled. 

In this situattion - 

1) What is the behaviour of Port-A IOs? will these port-A IOs be in tri-state mode? 

2) is it safe of IC to have VCCA disable and VCCB and OEn enable? 

Thanks and Regards

Tarang Jindal