Show HN: Vanilla-web skill to replace all JavaScript frameworks A developer released a publicly reviewed "skill" for coding agents that prescribes building web apps with only HTML, CSS and JavaScript — no framework, no bundler and no server logic. The skill was produced agentically: a coordinating agent ran five parallel research agents, a report writer and five reference writers, with a human reviewing and steering between rounds, and every rule in its references carries the link it was derived from. Verification against the example app with both HTML validators, ESLint, Prettier, tsc, a shell test, and axe plus element tests in Chromium, Firefox and WebKit surfaced defects that were corrected, including lazy-loaded island sheets shifting layout, an inline style breaking a strict CSP, a full list re-render dropping keyboard focus, and a form submitted before upgrade losing its input in 4 of 16 runs. A styleguide skill for building web apps with HTML, CSS and JavaScript only: no framework, no bundler, no server logic. It targets coding agents, but the conventions are the same ones a human team would adopt. This skill was developed agentically. A coordinating agent ran five parallel research agents, a report writer, and five reference writers, with a human reviewing and steering between rounds. The chain of evidence is kept: every rule in references/ carries the link it was derived from. It was manually reviewed though. Look here is a speling error as proof. 1. Research. Five agents each took one subtopic: semantic HTML and accessibility, custom elements, module architecture, lazy loading and fetching, and state, events, routing and security. They wrote notes with inline citations and flagged gaps and conflicting sources instead of resolving them silently. 2. Synthesis. One agent merged the notes into a report, keeping only sourced claims. The human read a summary and challenged it. 3. Decisions. The human set the premises below. The coordinating agent recorded them so later drafting could not re-argue them. 4. Style study. The coordinator read the Agent Skills specification, Anthropic's skill-authoring guide and this repository's prompting standard. It distilled them into rules: one imperative rule per line with its reason, one term per concept, a default plus an escape hatch, no dates in the body, and references one level deep. 5. Writing. The coordinator wrote SKILL.md , this README and the document-head reference. Five agents wrote the other references from the notes, under a shared terms table. 6. Verification. The coordinator built the example app and ran every gate the skill prescribes: both HTML validators, ESLint, Prettier, tsc, the shell test, and axe plus element tests in Chromium, Firefox and WebKit. The run found defects in the first draft, and the skill was corrected: - Island sheets shipped with lazy modules shifted layout. - An inline