{"version":"1.0","type":"rich","title":"Top Megacities Population","description":"This bar chart displays the populations of the world’s top 20 megacities, with each bar colored by continent—red for Asia, blue for North America, green for South America, and yellow for Africa—revealing that most megacities are in Asia. Using D3 v4 with SVG, the code applies `d3.scaleLinear` for the value axis, `d3.scaleBand` for the categorical city labels, and binds data to grouped `<g>` elements with rectangles and text labels. The dataset originates from Wikipedia’s Megacity page, and hover effects darken bars via CSS.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-bc73bc205ec19921c89fb2ce76ba703b?mode=embed\" width=\"960\" height=\"800\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":800,"cache_age":3600}