This example shows a 3D scatter plot with two groups of points rendered as floating markers in space. The visualization uses Plotly’s `scatter3d` traces, with the first trace having semi-transparent markers and the second using solid gray circles. Data is loaded from a remote CSV file via D3’s `d3.csv`, and the layout margins are set to zero to maximize the plot area. The chart is rendered inside a single `div` using `Plotly.newPlot`, with marker size, opacity, and line styling defined per trace.