In cases where a board of commissioners of a forest preserve district in a county having a population of less than 3,000,000 adopted, within the time required by law, tax levy ordinances in 1988, 1989, and 1990 for corporate, zoological, botanical, construction of improvements and development of forests and lands, and employees’ annuity and benefit fund purposes, or any other purpose, and filed, within the time required by law, a certified copy with the county clerk of the county in which the district is located, and thereafter adopted and published appropriation ordinances, within the time required by law, appropriating sums required to defray all necessary expenses and liabilities of the district to be paid or incurred during the fiscal years commencing in 1989, 1990, and 1991, including those sums which were raised by the 1988, 1989, and 1990 tax levies, then those tax levy ordinances, together with the taxes assessed, levied and extended, and the appropriation ordinances are validated, notwithstanding that the several amounts and purposes for which the taxes were levied and appropriations made for corporate, zoological, botanical, construction of improvements and development of forests and lands, and employees’ annuity and benefit fund purposes, or any other proper purpose, were not specifically itemized in detail, as required by statute, and notwithstanding that in the levy or appropriation ordinance stated amounts of money were levied and appropriated for named public purposes and general language was used which renders the amounts for such purposes uncertain and illegal, or the purposes for which the amounts were levied and appropriated uncertain and illegal. Nothing herein contained shall be construed as validating any tax levy in excess of the statutory rate of taxation authorized for the fiscal year or for any purpose not permitted by the constitution.