This visualization shows a seven-month line chart tracking the percentage of positive PCR tests in Sardinia, Italy, with data sourced from the Italian government's regional COVID-19 dataset. The React-based chart uses d3.scaleTime and d3.scaleLinear to map dates and percentages, while d3.line with curveNatural renders the smooth path. Each data point is marked with an SVG circle that includes a hover tooltip via the title element, and axes are generated using custom React components that leverage d3's scale ticks for positioning.