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Landmark One Main

Design
landmark-one-main

Landmark One Main is an Agent Skill for design published in the thedaviddias/Front-End-Checklist repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Use when reviewing rendered HTML, interactive components, or design-system patterns related to Use exactly one main landmark. Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output where relevant.

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How to use this skill

Bring this guide into your coding agent with a prompt tailored to the tool you use.

  1. Open your project in Codex.
  2. Copy and paste the prompt below.
  3. Review files and risks before approving any action.
Prompt to paste
Inspect the Agent Skill at https://github.com/thedaviddias/Front-End-Checklist/blob/HEAD/skills/landmark-one-main/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/landmark-one-main, but wait for my approval before writing files or running scripts.

Copying this prompt does not install or run the skill. Review third-party files before use.

Use exactly one main landmark

A single main landmark allows keyboard and screen reader users to jump directly to the primary content of the page, bypassing repetitive navigation.

Quick Reference

  • Ensure each page has exactly one <main> element
  • Avoid multiple elements with role='main'
  • Provides a clear starting point for the page's primary content

Check

Count the number of elements or elements with role='main' on the page to ensure there is exactly one.

Fix

Combine multiple main content areas into a single element or remove the 'role=main' attribute from extra containers.

Explain

Explain how the main landmark acts as a primary navigation target for assistive technologies, and why multiple main areas cause confusion.

Code Review

Review the rendered markup and interactive states that affect Use exactly one main landmark. Flag exact elements, roles, labels, focus behavior, or keyboard interactions that violate the rule, and note how to verify the fix with browser accessibility tooling or assistive tech.

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

Rule page: https://frontendchecklist.io/en/rules/accessibility/landmark-one-main