Pretty ChartsService

Pretty Charts renders a chart from inline data and returns it as static SVG, or a complete HTML document, inside a JSON object. POST /v1/chart with data (csv, tsv, json, or values) plus either a full Vega-Lite v6 spec or the shorthand form (type, x, y, color, size, shape, theta, ranges, colors, theme). Every data mark carries a native <title> tooltip, so no script is returned or required. Remote data URLs are refused; all inputs live in the request body. Output is deterministic for identical input on the same version. Limits (1 MiB body, 50k rows, 10k marks by default) are reported by GET /v1/capabilities.