Relating to a local option exemption from ad valorem taxation by a school district of all or part of the appraised value of the residence homesteads of certain individuals who are employed by the district.

Based solely on the provided context, a complete summary of HB 266 cannot be generated. The bill text is unavailable (marked as "This version is not currently available"), and no specific provisions, mechanisms, or policy details are included in the context. The title indicates it relates to property tax exemptions for school district employees' homes, but the actual scope and implementation are not described. Without the full bill text or legislative details, a factual summary meeting your requirements cannot be provided.