fresh block
This visualization displays a single, editable text message rendered in monospace on a blank SVG canvas. The code uses D3 v4 to append a text element to the SVG, positioning it at coordinates (120, 200) with a font size of 36 pixels. It relies on the `d3.select` and `svg.append` APIs to construct the basic scene, with the text content set to a placeholder prompt. The SVG canvas is fixed at 960 by 500 pixels, and the example serves as a starter template for building custom D3 visualizations in Blockbuilder.