HB 4005 revises special election and runoff election dates in Texas. It changes the runoff primary election date to the fourth Tuesday after the general primary election. The bill also shortens the time frame for special election runoffs, requiring them to be held within 30 days after the final canvass instead of the previous 70–77 day window. Additionally, it mandates that special elections to fill vacancies must be held within 90 days of the vacancy’s occurrence, except when the vacancy arises within 120 to 36 days before a uniform election date, in which case the election must occur on the first uniform election date after the 36-day mark.