How do I install the Unique Id skill?

Run npx skillmds@latest add thedaviddias/unique-id in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Unique Id skill do?

Use when reviewing templates, rendered HTML, or shared components related to Ensure all IDs are unique. Validate the final browser-facing markup, not just the source framework abstraction. It is listed under Web & Frontend on SkillMD.

Is Unique Id safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Unique Id?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Unique Id free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Unique Id?

thedaviddias (@thedaviddias) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Unique Id by thedaviddias — Agent Skill

Name: Unique Id
Author: thedaviddias

File contents

Ensure all IDs are unique

Duplicate IDs break form accessibility (labels don't connect), ARIA relationships fail, and JavaScript getElementById returns wrong elements—causing silent bugs.

Quick Reference

Each ID must appear only once per HTML document
Use classes for styling, IDs for unique anchors/references
Check for duplicates introduced by component libraries
Duplicate IDs break form labels, ARIA, and getElementById

Check

Scan this HTML document to ensure all ID attributes are unique across the entire page and properly reference related elements.

Fix

Remove duplicate ID values, ensure each ID is used only once per page, and update any references like labels, ARIA attributes, or JavaScript selectors.

Explain

Explain why unique IDs are essential for HTML validity, accessibility (form labels, ARIA), JavaScript functionality, and CSS styling.

Code Review

Review templates, server-rendered HTML, and shared components that output markup related to Ensure all IDs are unique. Flag exact elements, attributes, and routes where the rendered HTML violates the rule.

For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/en/rules/html/unique-id

Frequently asked questions

Unique Id