This area chart visualizes total movie ratings aggregated by genre, using a dataset loaded from a GitHub-hosted CSV file via `d3.csv`. The chart displays each genre on the x-axis with a rotated-axis label and total ratings on the y-axis, rendered as a filled purple area path generated with `d3.area()`. Circles mark each data point and reveal a tooltip on mouseover. The visualization employs `d3.rollup` to sum ratings and `d3.scaleBand` and `d3.scaleLinear` for axes, with SVG rendering and animated tooltip transitions.