Interactive buttons update a bar chart showing the percentage share of a sample that overreports voter turnout, with separate bars for female and male groups across the 2008, 2012, and 2016 datasets. The visualization uses D3.js v6 with an SVG rendering approach, where clicking a button triggers a transition that updates the x and y axes and smoothly animates the bar heights over one second. The code defines three static data arrays and employs d3.scaleBand for the categorical axis, d3.scaleLinear for the value axis, and transition methods to animate the chart between states.