A scatterplot of 20 fictional student marks displays each value as a pink dot, positioned with its value as both horizontal and vertical offset in viewport units, alongside a red underlined title. The example uses D3 v7 selection and join APIs, specifically `d3.select` and `d3.selectAll` with `.data()` and `.join()` to create and bind the data, then appends an SVG circle for each point. Data is hardcoded as an array in the script, and rendering uses SVG elements with absolute positioning.