This example displays a static bar chart with four vertical bars in red, yellow, blue, and green, each with varying heights and positioned across a fixed 640×420 canvas. It uses raw SVG `<rect>` elements directly written in the HTML, with no JavaScript or data-binding libraries, and relies solely on hard-coded coordinates and dimensions for the bars. The rendering approach is pure SVG markup, with each bar’s fill color specified as a CSS color keyword.