fresh block
This chart visualizes global population data with a circular bubble layout, where each circle's size corresponds to a country’s population value from POP.csv. The visualization uses d3.pack to compute the hierarchical circle packing, with colors assigned via d3.scaleOrdinal and d3.schemeCategory20c. Circle labels are clipped using SVG clipPath elements, while d3.csv loads the data and d3.hierarchy structures it. Each bubble includes a tooltip showing the country name and its formatted population figure.