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viewport-zoom

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Use when applies to any `<meta name='viewport'>` element in HTML documents. Check the `content` attribute for `user-scalable=no`, `user-scalable=0`, `maximum-scale=1`, or `maximum-scale` values less than 2. This is a common mistake in mobile-first templates and CSS frameworks.

skills/viewport-zoom/SKILL.md

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# Do not disable pinch zoom

Pinch-to-zoom is an essential accessibility feature for low-vision users who cannot read text at the page's default size. When zoom is disabled, these users cannot enlarge text or images, making the page completely inaccessible without external magnification software. Low-vision users who rely on browser zoom are entirely blocked. Additionally, all users benefit from being able to zoom in on small text, fine-print, or complex images. Disabling zoom is one of the most harmful and easily preventable accessibility failures.

## Quick Reference

- Never use `user-scalable=no` or `user-scalable=0` in the viewport meta tag
- Never set `maximum-scale=1` (or any value below 5) in the viewport meta tag
- Both prevent pinch-to-zoom, violating WCAG 2.1 SC 1.4.4 (Resize Text, Level AA)
- The correct viewport meta tag is: `<meta name='viewport' content='width=device-width, initial-scale=1'>`
- Note: iOS 10+ ignores `user-scalable=no` in Safari, but other browsers and older iOS do not

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