A forked bar chart displays the popularity percentages of ten programming languages from Stack Overflow's 2019 survey. Using D3.js v5 with SVG, the chart renders horizontal gridlines, axes, and value labels. On mouseenter, a dashed reference line appears and text labels show the percentage divergence between the hovered bar and every other bar. The code applies d3.scaleBand and d3.scaleLinear with d3.axisLeft and d3.axisBottom, plus transitions for opacity changes.