Tex. Tax Code § 1.02

This title applies to a taxing unit that is created by or pursuant to any general, special, or local law enacted before or after the enactment of this title unless a law enacted after enactment of this title by or pursuant to which the taxing unit is created expressly provides that this title does not apply. This title supersedes any provision of a municipal charter or ordinance relating to property taxation. Nothing in this title invalidates or restricts the right of voters to utilize municipal-level initiative and referendum to set a tax rate, level of spending, or limitation on tax increase for that municipality.