{"version":"1.0","type":"rich","title":"Margin Convention Coronavirus Line Chart w/ 1M Marker","description":"This line chart tracks global cumulative COVID-19 deaths over time using the Johns Hopkins dataset. It highlights the one-million-death milestone with a horizontal marker line and labels the most recent date with a vertical “now” marker. Built with React and D3 v6, the chart uses `d3.scaleTime` and `d3.scaleLinear` for axes, `d3.line` for the path, and custom SVG marker components. The viewport fills the browser window, and margins are explicitly set to position the visualization within the SVG.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/63fe328544584b8180e9694585f7b5a4?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}