This example demonstrates how to format axis tick labels as percentages in an SVG scatterplot using D3.js version 4.5.0. The code creates random data points, scales them with `d3.scaleLinear` and `d3.scaleSqrt`, and applies a custom percentage format via `d3.format(".1%")` to both the bottom and left axes using `d3.axisBottom` and `d3.axisLeft`. The axes are rendered as SVG groups, with circles representing the data.