Will the seat and the lid both close if left up?

The seat an lid will not close together. You have to let the seat get started (into the closed position) and then you drop the lid. Both the seat and lid close slowly. Yeah! no loud slamming noise.

The seat and lid both are slow closing so there is no loud bang when they hit the toilet. They must be activated by a gentle start, they are not automatic. It would take too much technology to be sold at this price to make them close by themselves.

Yes, both the lid and the seat are self-closing. The seat will close either separately or in unison with the lid.

Must touch each one separately.

Thank you for your inquiry. Only the lid on this seat is has the quiet close hingest which prevents the lid from slamming when you go to close it. The seat itself is not a slow close.