A fenced code block becomes a live, isolated iframe figure. Each figure gets its own disposable realm — srcdoc, sandbox="allow-scripts", no allow-same-origin — so it cannot reach the page around it.

every block type, rendered from markdown

Rendered in the browser by the same remark plugin a build uses, highlighted by highlightCode from @briwa.dev/sandbox/editor — the Lezer parsers CodeMirror already ships, so no Shiki and no Astro.

markdown in, live figures out

Edit the markdown; the figures rebuild as you type.

load

These panels import the package by its public name; the aliases in vite.config.js point them at src/, so edits show up without a package rebuild.