This example demonstrates a minimal D3 v7 bar chart, displaying a static dataset of five values as vertical rectangles. The visualization shows how to bind data to SVG elements and map data values to visual properties. The chart is rendered in an SVG container using D3's selection, data-join, and attribute methods, including `selectAll`, `data`, `enter`, `append`, and `attr`. The code also sets the page text to "Hello D3 version 7" via the `select` function, while the chart dimensions and padding are defined as constants.