This example demonstrates a dynamic bar-style visualization where clicking a button generates a new array of 20 random numbers and renders them as a set of div elements whose widths are proportional to their values. Using the D3.js v6 library, the code employs `d3.select` and `selectAll` to manage the div elements, with an accessor function for styling. The rendering process separates new, existing, and removed elements through `div_selector.enter()`, `div_selector.exit()`, and an update function that assigns text, fixed height, dynamic width, and light grey background color.