A minimal D3.js starter template displays the text “Edit the code below to change me!” in a 36-pixel monospace font, centered near the top of an SVG canvas. The example creates a 960-by-500-pixel SVG element via `d3.select("body").append("svg")` and positions the text using `attr("x", 120)` and `attr("y", 200)`. It serves as a bare-bones scaffold for editing code in Blockbuilder, with no data binding or interactions beyond static text rendering. The HTML includes the d3.v4 library from a CDN and uses standard SVG attributes for styling.