Use when reviewing templates, rendered HTML, or shared components related to Set the responsive viewport meta tag. Validate the final browser-facing markup, not just the source framework abstraction.
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---
name: viewport
description: "Use when reviewing templates, rendered HTML, or shared components related to Set the responsive viewport meta tag. Validate the final browser-facing markup, not just the source framework abstraction."
metadata:
category: html
priority: critical
difficulty: beginner
estimatedTime: "5"
source: frontendchecklist.io
url: https://frontendchecklist.io/rules/html/viewport
---
# 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: <meta name="viewport" content="width=device-width, initial-scale=1.0"> 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.
---
For full implementation details, code examples, and framework-specific guidance,
see `references/rule.md`.
Rule page: https://frontendchecklist.io/rules/html/viewport
