Section 10. Savings provisions.
(a) Tax ordinances.--The validity of any ordinance or part of any ordinance providing for or relating to the imposition, levy or collection of any tax passed by the council of a city of the first class, and any amendments or supplements thereto, shall not be affected or impaired by anything contained in this act.
(b) Constraints.--Nothing contained in this act shall be construed to empower a city of the first class to levy and collect the taxes hereby imposed not within the taxing power of this Commonwealth under the Constitution of the United States.