{"version":"1.0","type":"rich","title":"Add buttons","description":"This treemap visualizes U.S. steel scrap export values by partner country and commodity, using area size and a light-to-dark blue color scale to encode magnitude. Clicking a country drilils down to show individual commodity values, while a reset button restores the top-level view. The D3 v7 implementation uses d3.hierarchy, d3.treemap, and d3.scaleSequential with interpolateRgb, rendering SVG rectangles with transitions and tooltips via title elements. Data comes from a CSV file with partner country, commodity description, and value fields.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/bf3b906ec14244cfa448702639f0637b?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}