This example shows a static bar chart of immunization policy data across WHO regions, with counts for mandatory, recommended, and school-entry vaccines. The SVG renders a blank canvas at 960x500, while the code loads `data.csv` using d3.csv and logs the parsed data to the console. The visualization currently displays no marks, as the code only fetches the dataset without binding it to shapes or scales. It uses d3.v7 and React, with the SVG element selected via d3.select.