"Payload CMS" matching MCP connectors:

Give your agent a real design system: tokens, measured WCAG contrast, and rules to follow.

JSON in, PDF out. Render invoices, certificates, reports and cards from a template and a payload.

Validate JSON, YAML, XML and CSV with exact line/column errors and silent-corruption warnings.

What CSS you can actually ship today, from live Baseline data and MDN browser-compat-data.

UTC millisecond 0-999 band

KSUID payload charset, value discarded

Ems at 12pt to millimeters, number discarded

UUID v7 unix-ms layout, value discarded

CSS escape sequence count, input discarded

UTC millisecond 0-999 band

data: URI media-type only, payload discarded

CSS rule count, stylesheet discarded

ULID millisecond prefix, value discarded

Meaning of HTTP 413.

Spans to centimeters, number discarded

Knots to m/s, number discarded

Miles/h to m/s, number discarded

Whether a number looks like unix milliseconds

CSS rule count, body discarded

Unix epoch milliseconds