Write an HTML surface's body. Pass any of `html` / `css` / `js`; omitted fields stay unchanged. Pass empty string to clear. The surface renders in a sandboxed iframe on a separate origin (`render.trydock.ai`) with no access to Dock cookies, storage, or parent DOM — you have free rein inside that boundary. Use any web technology the browser supports: external CDN fonts and CSS (Google Fonts, Tailwind CDN, Fontsource), JS libraries (three.js, GSAP, Chart.js, anime.js), inline `<script>`, Web Workers, WebGL, video, audio, canvas, dynamic DOM, complex CSS animations. Per-field caps: html 256 KB, css 200 KB, js 200 KB, total 600 KB. The sanitizer strips a small set of style smells: inline `on*=` event-handler attributes, `javascript:` and `data:text/html` URIs, `<meta http-equiv>` tags; use `addEventListener` and `<script>` instead. Requires editor role.
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