This line chart visualizes the average number of likes per account across years, based on a TikTok dataset loaded from a GitHub gist. The code defines the chart margins and scales, plotting the year on the x-axis and average likes on the y-axis. It uses `d3.scaleTime`, `d3.scaleLinear`, `d3.axisBottom`, `d3.axisLeft`, and `d3.line` to construct the visualization within an SVG. The chart is rendered with a blue polyline and styled axis labels, with the data's numeric values converted from strings for accurate plotting.