A D3.js bar chart visualizes a single student’s self-assessed skills across five categories: programming, computers, art, communication, and collaboration. Each category is rendered as a fixed-width rectangle, with bar heights scaled by multiplying the numerical skill value by ten. The chart uses SVG rectangles appended directly to a hardcoded, static data object, with no axes or scales defined. Interactive tooltips appear on hover, implemented via D3 mouseover, mousemove, and mouseleave event handlers that dynamically update an HTML div’s opacity and position.