Set the responsive viewport meta tag

Without the viewport meta tag, mobile browsers render pages at desktop width (typically 980px) then shrink them, making text unreadable without zooming.

Quick Reference

• Add <meta name="viewport" content="width=device-width, initial-scale=1.0">
• Never use maximum-scale=1 or user-scalable=no (breaks accessibility)
• Essential for mobile-responsive layouts

Check

Verify that this HTML document includes a proper viewport meta tag for responsive design that controls how the page is displayed on mobile devices.

Fix

Add the viewport meta tag: in the head section.

Explain

Explain how the viewport meta tag enables responsive design and why it's essential for mobile-first web development.

Code Review

Review templates, server-rendered HTML, and shared components that output markup related to Set the responsive viewport meta tag. Flag exact elements, attributes, and routes where the rendered HTML violates the rule.

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

Rule page: https://frontendchecklist.io/en/rules/html/viewport