Disclosure of Estimated Ad Valorem Taxes; Defining the terms “listing platform” and “property”; requiring that certain property listings include estimated ad valorem taxes; requiring the Department of Revenue to maintain on its website a table of links to each county’s property appraiser’s homepage and tax estimator; requiring the department to develop a formula that may be used by listing platforms to calculate the estimated ad valorem taxes; requiring the department to annually develop a countywide aggregate average millage rate for each county for use by listing platforms, etc.