This example demonstrates how D3.js handles errors when loading JSON and XML data from both same-domain and cross-domain sources. It uses D3’s data-loading methods to fetch files and displays the successful results or error messages in the page’s DOM, rendering them as structured text in a report div. The code interacts directly with the browser’s network stack, showing the divergence between valid responses and rejection paths. The implementation is based on a minimal HTML page with a single reporting container and does not employ visual encoding or layout techniques beyond plain text output.