HTML

What this skill does

Writes, reviews, and fixes HTML markup: semantic structure, forms, accessibility, the document head, media and embeds. Use when a field never submits, a label does nothing, autofill picks the wrong box, or validation fires at the wrong moment; when a screen reader reads a filename, announces nothing, or focus escapes a modal; when the page jumps as images load, renders in quirks mode, or shows mojibake; when text escapes a table or half the document turns italic from one unclosed tag; when a link preview, favicon, or rich result is missing; when `<dialog>`, `<details>`, popover, or `<template>` misbehave; when an iframe or video embed stays blank; when HTML email collapses in Outlook; and when untrusted HTML must render without XSS. Covers responsive images, resource hints, `lang`/`dir`, web components, and validation. Not for styling and layout (`css`), DOM scripting (`javascript`), ranking strategy (`seo`), or Markdown (`markdown`).

HTML is part of the Developer Tools category — developer tools that help your agent write, review, debug, and ship code. You can install it on its own or alongside other developer tools skills from the OpenClaw catalog.

How to install HTML

The easiest path is via the OpenClaw Easy desktop app — one click, no terminal required:

1. Download OpenClaw Easy for macOS or Windows (free, one-click installer, ~30 seconds).
2. Open the in-app Skills panel.
3. Search for html and click Install.
4. The skill activates automatically when an incoming message matches its description.

Install from the command line

If you already run the OpenClaw CLI, add HTML with a single command:

openclaw skills add html

This pulls html from ClawHub and installs it into ~/.openclaw/skills/html/. Restart the OpenClaw gateway afterwards so the new skill is discovered.

How to use HTML

Once installed, HTML activates on its own: when an incoming message on WhatsApp, Telegram, Slack, Discord, Feishu or Line matches the skill's description, your OpenClaw agent loads it and runs the workflow. You can also trigger it explicitly by describing the task in chat. No extra configuration is required after install.

Turning video into a finished short

HTML works with video. Getting from there to something postable is a separate job: ViralMint — an open-source video pipeline — reframes to vertical, cleans the audio, cuts dead air, burns animated captions, and exports a version sized for TikTok, Reels, and Shorts.

It runs as an MCP server, so an OpenClaw agent can drive it from the same chat you already use: ask for a short, and the render comes back finished. See how to connect a video pipeline to your agent.

Manual install (advanced)

If you prefer manual installation:

1. Click the Download .zip button above to grab html-latest.zip directly from our S3 mirror.
2. Unzip into ~/.openclaw/skills/html/ (create the directory if it does not exist).
3. Restart OpenClaw Easy (or the OpenClaw CLI gateway) so the new skill is discovered.

Frequently asked questions

How do I install HTML?

Install HTML in the OpenClaw Easy desktop app by opening the Skills panel, searching for html, and clicking Install. From a terminal you can run: openclaw skills add html. Either way the skill is placed in ~/.openclaw/skills/html/.

Is HTML free?

Yes. HTML is free and open-source, distributed under the Apache-2.0 license through ClawHub. No account or payment is required to download or run it.

What does HTML do?

Writes, reviews, and fixes HTML markup: semantic structure, forms, accessibility, the document head, media and embeds.

Related: more developer tools skills

If HTML looks useful, you may also want to check out other developer tools skills in the OpenClaw catalog:

• GStack Review Stack ⬇ 3.1K
• Cross-Pollination Engine ⬇ 3.1K
• CSS ⬇ 3.1K
• GitLab ⬇ 3.1K
• Context7 API Documentation Fetcher ⬇ 3.1K

Browse the full OpenClaw skill catalog

This page covers just one skill. The OpenClaw skill hub has 10,000+ more — search, sort by downloads or stars, and install any of them in one click. There is also a curated awesome-openclaw-skills list grouped by use case.