This interactive scatter plot displays the Iris dataset, plotting sepal length against sepal width, with point size encoding petal length and both color and symbol shape distinguishing the three species. A legend on the right allows filtering by clicking a species: selecting one dims all other points to 10% opacity, while clicking the same legend item again restores full visibility. The visualization uses D3 v4 with SVG rendering, employing `d3.scaleLinear`, `d3.scaleSqrt`, `d3.symbol`, and `d3.schemeCategory20`. Data is loaded from a local CSV file, and tooltips are present though their content is not defined.