simple scatterplot
This simple scatterplot displays seven data points on a Cartesian grid, with x-values ranging from 0 to 50 and y-values from 0 to 70. The visualization uses D3 v4’s `d3.scaleLinear` to map data coordinates to pixel positions, and `d3.axisBottom` and `d3.axisLeft` to render the axes. Circles are appended to an SVG canvas, with their radius and fill color varying per index. The data is hardcoded as an array of objects, and the axes are positioned using SVG `transform` attributes.