D3 Line chart experiment
This experiment demonstrates a minimal D3 line chart setup, rendering a single HTML element with a large font size. The page loads D3 v7 from a CDN and applies a blue color style to a paragraph with the ID `#d3_p` using D3’s selection API. The layout uses a giant 13em font for the body, though no data or line geometry is actually drawn. The example serves as a starting point for basic DOM manipulation with D3, not a full chart.