Agent skill

Viewport Zoom

by thedaviddias in thedaviddias/Front-End-Checklist

A skill your agent uses when applies to any <meta name='viewport' element in HTML documents.

MITAuto-check passedFrontend & Design

Install Viewport Zoom

skills CLI
$ npx skills add thedaviddias/Front-End-Checklist --skill viewport-zoom -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install thedaviddias/Front-End-Checklist viewport-zoom --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/viewport-zoom .claude/skills/viewport-zoom && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
viewport-zoom
GitHub stars
74k
Token cost
~890 tokens
SKILL.md length
426 words
Files
2 (incl. references)
Skills in repo
390
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when applies to any <meta name='viewport' element in HTML documents.

  • Applies to any <meta name=viewport element in HTML documents
  • SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Tasks that involve Responsive design

What it does

Viewport Zoom is an agent skill from thedaviddias/Front-End-Checklist. 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.

Its SKILL.md is about 890 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).

It sits in Frontend & Design, covering Responsive design. It works with iOS. The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.

When your agent uses it

  • Applies to any <meta name=viewport element in HTML documents
  • Tasks that involve Responsive design

Example prompts

  • “viewport”
  • “/viewport-zoom”

What it can do on your machine

Read from SKILL.md and the folder at commit e8d14d0. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • frontendchecklist.io

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Viewport Zoom loads about 890 tokens when it runs, and up to ~1.7k if it reads all its reference files. Until then it costs about 73 tokens; SKILL.md has 426 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~73
When it runs · the whole SKILL.md, loaded when a task matches
~890
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.7k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 426 words, ~890 tokens.

Download SKILL.mdSave it as .claude/skills/viewport-zoom/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
viewport-zoom
description
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.
metadata.category
accessibility
metadata.priority
high
metadata.difficulty
beginner
metadata.estimatedTime
5
metadata.source
frontendchecklist.io
metadata.url
https://frontendchecklist.io/rules/accessibility/viewport-zoom

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

Check

Find the <meta name='viewport'> element in the HTML <head>. Check its content attribute for: (1) user-scalable=no — disables all zoom; (2) user-scalable=0 — same effect; (3) maximum-scale=1 or maximum-scale=1.0 — limits zoom to the initial scale; (4) any maximum-scale value below 2 — significantly limits zoom range. Flag any of these. Also check CSS for touch-action: none or user-zoom: fixed (CSS Device Adaptation, rarely used) that may limit zoom.

Fix

Remove user-scalable=no and maximum-scale=1 from the viewport meta tag. The correct viewport meta tag for a responsive site is: <meta name='viewport' content='width=device-width, initial-scale=1'>. If maximum-scale was set for a specific reason (e.g., to prevent unintended zoom on input focus on iOS), the correct fix is to set form input font-size: 1rem (16px) instead — iOS Safari only auto-zooms on input focus when font-size is below 16px.

Show full SKILL.md (149 more words)Show less

Explain

WCAG 2.1 SC 1.4.4 (Resize Text, Level AA) requires that text can be resized up to 200% without loss of content or functionality, except for captions and images of text. On mobile devices, pinch-to-zoom and the browser's built-in text size settings are the primary mechanisms for resizing text. Setting user-scalable=no or maximum-scale=1 in the viewport meta tag disables pinch-to-zoom entirely (or limits it to 1x), preventing low-vision users from enlarging content. This is a direct violation of SC 1.4.4. While iOS 10+ Safari ignores these settings, Android browsers, Chrome for iOS, and older iOS versions do not — so the setting must be removed regardless.

Code Review

Review stylesheets, component styles, and responsive states related to Do not disable pinch zoom. Flag exact selectors, declarations, or breakpoints that violate the rule in the rendered UI.


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

Rule page: https://frontendchecklist.io/rules/accessibility/viewport-zoom

© thedaviddias, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in skills/viewport-zoom of thedaviddias/Front-End-Checklist.

  • SKILL.md
  • references/rule.md

Open the folder on GitHubat commit e8d14d0

Compare with similar skills

Viewport Zoom next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Viewport Zoom compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Viewport Zoom this skillthedaviddias/Front-End-Checklist74k—~890Automated safety check: PassMIT
Ipados Design Guidelinesehmo/platform-design-skills606—~6.4kAutomated safety check: PassMIT
Dotnet UInovotnyllc/dotnet-artisan232—~1.3kAutomated safety check: PassMIT
Responsive CSSTheDecipherist/claude-code-mastery-project-starter-kit338—~2.2kAutomated safety check: PassMIT
Platform ConventionsOwl-Listener/designer-skills2.9k—~1.6kAutomated safety check: PassMIT
UI Designhashgraph-online/awesome-codex-plugins1.3k—~904Automated safety check: PassApache-2.0

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    232 GitHub stars~1.3k tokensUpdated 3 days ago
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Works with

Questions about Viewport Zoom

What does Viewport Zoom do?

A skill your agent uses when applies to any <meta name='viewport' element in HTML documents. Viewport Zoom is an agent skill from thedaviddias/Front-End-Checklist. Use when applies to any <meta name='viewport' element in HTML documents.

When should I use Viewport Zoom?

Viewport Zoom fits situations like: applies to any <meta name=viewport element in HTML documents; tasks that involve Responsive design.

How do I install Viewport Zoom in Claude Code?

Run `npx skills add thedaviddias/Front-End-Checklist --skill viewport-zoom -a claude-code`. Or copy the skill folder (skills/viewport-zoom in thedaviddias/Front-End-Checklist) into .claude/skills/viewport-zoom in your project. Claude Code loads it when a task matches its description.

How do I install Viewport Zoom in Codex?

Run `npx skills add thedaviddias/Front-End-Checklist --skill viewport-zoom -a codex`. Or copy the skill folder (skills/viewport-zoom in thedaviddias/Front-End-Checklist) into .agents/skills/viewport-zoom in your project. Codex loads it when a task matches its description.

Can I use Viewport Zoom in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add thedaviddias/Front-End-Checklist --skill viewport-zoom -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/viewport-zoom, .gemini/skills/viewport-zoom, .github/skills/viewport-zoom and .opencode/skills/viewport-zoom in your project.

What does Viewport Zoom need to run?

SKILL.md names no scripts, command-line tools or credentials: Viewport Zoom is instructions for the agent only.

Does Viewport Zoom access the network?

SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.

Is Viewport Zoom safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Viewport Zoom use?

Viewport Zoom is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Viewport Zoom use?

About 890 tokens (SKILL.md is roughly 3.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 776 tokens, read only when the agent opens those files.

What are the alternatives to Viewport Zoom?

Skills that share tags, products or a category with Viewport Zoom: Ipados Design Guidelines (ehmo/platform-design-skills, 606 stars), Dotnet UI (novotnyllc/dotnet-artisan, 232 stars), Responsive CSS (TheDecipherist/claude-code-mastery-project-starter-kit, 338 stars) and Platform Conventions (Owl-Listener/designer-skills, 2.9k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Viewport Zoom?

thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,421 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.

Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.