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A new "html" canvas template lets the agent generate standalone HTML documents (reports, specs, one-pagers) alongside freeform React canvases, published through the same desktop-file-system canvas flow. Documents render in a null-origin sandboxed iframe with a locked-down CSP and an injected annotation shim; teammates can comment by selecting text, picking an element, or on the whole page, with numbered pins and a side-panel thread view backed by PostHog's comments API. Generated-By: PostHog Code Task-Id: b6ef557f-b02a-45d6-9128-577e1fbad8b1
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React Doctor found no issues in the changed files. 🎉 Reviewed by React Doctor for commit |
![github-advanced-security[bot]](https://avatars.githubusercontent.com/in/57789?s=60&v=4){kind=small}
| const doc = buildHtmlArtifactDocument(html); | ||
| const stripped = doc | ||
| .replace(/<meta http-equiv="Content-Security-Policy"[^>]*>/, "") | ||
| .replace(/<script>[\s\S]*<\/script>/, ""); |
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Problem
Agents can already build freeform React canvases in Channels, but there's no way to generate a plain document artifact — a report, spec, or one-pager — and no way for teammates to leave feedback anchored to specific parts of a canvas. Inspired by puemos/peek.
Changes
html): the agent authors a complete standalone HTML page (self-contained inline CSS/JS, PostHog numbers baked in at generation time via MCP) and publishes it through the existingdesktop-file-system-canvas-partial-updateflow. Versions, undo/redo, fork, share links, the Artifacts tab, and the dashboards grid all work unchanged.sandbox="allow-scripts"iframe (HtmlArtifactFrame, no warm pool) with an injected CSP that blocks all network egress.scope: "code_canvas", anchor JSON initem_context, replies viasource_comment, soft delete) — first wiring of that generated-client surface — so every project member sees them via polling. Side panel gains a Comments tab with threads, replies, and delete-own.How did you test this?
pnpm --filter @posthog/core test -- --run(2504 tests) andvitest run src/features/canvasinpackages/ui(170 tests), including new suites for the protocol schemas, comment threading/orphan parsing, shim algorithms (text-quote capture/resolution, CSS-path round-trips in jsdom), CSP/shim document splicing, and the HTML generation-prompt branch.pnpm --filter @posthog/{core,api-client,ui,code,web} typecheckandbiome lintall clean.Automatic notifications
Created with PostHog Code