This example shows the shifting market share of recorded music formats from 1980 to 2010, using a stacked area chart to track the rise and fall of media like vinyl, cassettes, CDs, and digital downloads. The visualization uses D3.js to generate the chart, likely with `d3.stack()` and `d3.area()` to create the layered series from the provided yearly data. It illustrates how compact discs dominated the market by the mid-1990s, while cassette tapes declined and digital formats began to emerge in the late 2000s. The data appears to be drawn from a CSV or similar tabular source, processed directly into the chart’s scales and axes.