This bubble chart visualizes the Iris dataset, plotting petal length against sepal length for individual flowers. Circle size encodes sepal width, while color distinguishes the three Iris species (setosa, versicolor, and virginica). The visualization uses D3 v7 with SVG rendering, employing `d3.scaleLinear` for position and radius, `d3.scaleOrdinal` for color mapping, and `d3.axisBottom`/`d3.axisLeft` for axes. Data is loaded asynchronously via `d3.csv` from a GitHub-hosted CSV file.