Creates the Local Official Vacancy Posting Act. Provides that a unit of local government shall post every elected official vacancy on its website, if the full-time staff of the municipality maintain the website, and the county clerk shall also post the vacancy on the county clerk website. Provides that the unit of local government may not fill the vacancy until the posting has been on the municipality's website, or the county's website if the municipality does not have full-time staff maintaining a website, for at least 15 days. Limits home rule powers.