A bubble chart visualizes manga and webtoon popularity by mapping the number of chapters on the x-axis, readers on the y-axis, and rating to bubble size, with genre encoding color. The D3.js v7 code loads CSV data and uses `d3.scaleLinear` for axes and bubble radius, plus `d3.scaleOrdinal` with `d3.schemeCategory10` for color. Interactive tooltips appear on mouseover, and an animated legend illustrates rating values using overlay circles.