This example demonstrates an XmR control chart—a statistical process control tool—by loading a CSV dataset of numeric measurements and computing the moving range between consecutive values. The visualization itself is not yet rendered; instead, the code focuses on data preprocessing using `d3.csv` and `d3.mean` to parse and log the raw values and their absolute differences. The D3 v6 library fetches data from a GitHub Gist, while a minimal HTML page sets up a blank canvas with oversized text styling, leaving the chart implementation open for future steps.