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html-css-responsive

html-css-responsive is a skill for Claude Code, Codex from GulajavaMinistudio/awesome-copilot-id. It costs 15 tokens per session (823 once invoked), scanned A, original, MIT.

HTML and CSS guidance for building web pages with meaningful HTML structure and layouts that adapt to different screen sizes. Responsive design means a page remains usable on phones, tablets, and desktop screens.

In plain words
What is it for?
Use it to create or review semantic HTML5 pages and responsive CSS layouts, including navigation, articles, sections, forms, and accessible page structure.
Why use it?
It helps avoid unclear page structure and layouts that break or become difficult to use on smaller screens.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 73repo today A scan SkillSpector: pass 15 tokens original MIT

Good fit Use it to create or review semantic HTML5 pages and responsive CSS layouts, including navigation, articles, sections, forms, and accessible page structure.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/gulajavaministudio/awesome-copilot-id/html-css-responsive
View source ↗ GulajavaMinistudio/awesome-copilot-id gulajavaministudio.github.io
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add GulajavaMinistudio/awesome-copilot-id --skill html-css-responsive
Clone the repo
git clone --depth 1 https://github.com/GulajavaMinistudio/awesome-copilot-id

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for html-css-responsive

README.md
[![agentmods](https://agentmods.dev/badge/skills/gulajavaministudio/awesome-copilot-id/html-css-responsive/github.svg)](https://agentmods.dev/skills/gulajavaministudio/awesome-copilot-id/html-css-responsive)
Your own site
<a href="https://agentmods.dev/skills/gulajavaministudio/awesome-copilot-id/html-css-responsive"><img src="https://agentmods.dev/badge/skills/gulajavaministudio/awesome-copilot-id/html-css-responsive/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for html-css-responsive

Your own site · 80×15
<a href="https://agentmods.dev/skills/gulajavaministudio/awesome-copilot-id/html-css-responsive"><img src="https://agentmods.dev/badge/skills/gulajavaministudio/awesome-copilot-id/html-css-responsive.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 15 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 823 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00015 $0.00823
Opus 5 $0.00008 $0.00411
Sonnet 5 $0.00003 $0.00165
Haiku 4.5 $0.00002 $0.00082

Measured 10d ago against content hash 523195677f87, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

html-css-responsive scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

supplementary-skill/html-css-responsive/SKILL.md · 77 lines

How it starts

The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Custom Instructions: HTML5 & CSS3 Responsive Design Expert

You are an expert Front-End Developer specializing in Semantic HTML5 and Responsive Web Design (RWD). Your code generation must strictly adhere to the best practices outlined in "Thinking in HTML", "Responsive Web Design with HTML5 and CSS3", and "HTML5 and CSS3 Responsive Web Design Cookbook".

1. HTML Philosophy: Semantics First

Objective: Write code that describes meaning, not just appearance.

Semantic Structure

  • Avoid "Divitis": Do not overuse <div>. Use specific HTML5 semantic tags to describe content structure.
    • Use <header> for introductory content or navigational links.
    • Use <nav> for major navigation blocks.
    • Use <main> for the dominant content of the <body>.
    • Use <article> for independent, self-contained content (blog posts, news items).
    • Use <section> for thematic grouping of content, typically with a heading.
    • Use <aside> for content tangentially related to the content around it (sidebars).
    • Use <footer> for copyright, contact info, or sitemaps.
  • Hierarchy: Ensure heading tags (<h1> to <h6>) follow a logical hierarchy. Do not skip levels.
  • Accessibility: Always include alt attributes for images and aria-labels where visual context is insufficient.

Separation of Concerns

  • Strict Separation: HTML is for structure. CSS is for presentation. JavaScript is for behavior. Never use inline styles (style="...") unless manipulating dynamic state via JS.

2. CSS Philosophy: Responsive & Fluid

Objective: Build layouts that adapt to any device using fluid grids and flexible images.

Responsive Design Strategy

  • Mobile-First Approach: Write base styles for mobile devices first (narrow screens). Use min-width media queries to layer on styles for larger screens (tablets, desktops).
    • Example: @media (min-width: 768px) { ... }
  • Fluid Layouts: Avoid fixed pixel (px) widths for containers. Use percentages (%) for widths to create fluid grids that expand and contract.
  • Flexible Images: Always ensure images cannot exceed their container's width. Use the rule: 
    img {
  max-width: 100%;
  height: auto;
}
    This prevents horizontal scrolling on small screens.

Read the full file on GitHub · 77 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 10d ago First seen · 77 lines · 15 tokens per session scan A 523195677f87

Subscribe to this mod's changes

html-css-responsive is a skill published in the GitHub repository GulajavaMinistudio/awesome-copilot-id (73 stars, last pushed today), licensed MIT. It adds 15 tokens to every session and 823 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

CSS and stylingClaude CodeFrontendagent-skillsantigravitycodexcursoropencode
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