This example demonstrates basic D3 selection mechanics by appending an SVG canvas to the body and binding an array of 15 integers to circle elements using `d3.select` and `d3.selectAll`. The code initializes a `range` dataset and prepares a data join with `svg.selectAll('circle').data(data)`, though it does not render any visible circles. Using D3 v7.9.0, it shows the initial steps of selecting, binding, and sizing an SVG to the full browser window.