Fork of Circles with D3
A D3.js scatter plot displays country-level COVID-19 data, plotting population density against median age for a dataset loaded from mergedata.json. The visualization uses d3.scaleLinear for both axes, d3.axisBottom and d3.axisLeft for gridlines, and d3.selectAll with data binding to render interactive circles. A tooltip, styled with CSS, appears on mouseover to show the country name, population density, and median age, while the circles change color on hover.