Use when designing HTML semantics, accessible forms, responsive layouts, typography or reduced-motion behavior. Not for a Web Interface Guidelines compliance audit; use web-design-guidelines.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# UI/UX Best Practices Frontend Design
Comprehensive UI/UX and frontend design best practices guide. Contains 42 rules across 8 categories, prioritized by impact to guide accessible, performant, and user-friendly interface development.
## When to Apply
Reference these guidelines when:
- Structuring HTML for accessibility and semantics
- Writing CSS for responsive layouts and visual hierarchy
- Optimizing images and fonts for Core Web Vitals
- Designing forms with proper validation and error handling
- Adding animations and interactive elements
## Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|----------|----------|--------|--------|
| 1 | Accessibility & WCAG Compliance | CRITICAL | `access-` |
| 2 | Core Web Vitals Optimization | CRITICAL | `cwv-` |
| 3 | Visual Hierarchy & Layout | HIGH | `layout-` |
| 4 | Responsive & Mobile-First Design | HIGH | `resp-` |
| 5 | Typography & Font Loading | MEDIUM-HIGH | `typo-` |
| 6 | Color & Contrast | MEDIUM | `color-` |
| 7 | Forms & Validation UX | MEDIUM | `form-` |
| 8 | Animation & Performance | LOW-MEDIUM | `anim-` |
## Quick Reference
### 1. Accessibility & WCAG Compliance (CRITICAL)
…
The line at the top of this page pins the label git:20261026.fc845e3, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (4889 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag
Source
GitHub
cratis/ai · 4 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_qkuufttsakwg5bd4
GET https://markdownregistry.com/api/v1/resolve?ref=cratis/ai/ui-design
GET https://markdownregistry.com/api/v1/blob/ac6b26ef60b4aa2aa3ae3d6f3559dacd6def20f87dbea5b7754fc9bde6061063
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
cratis/ai · .cratis/ai/skills/analyzing-dotnet-performance/SKILL.md · Use when reviewing .NET hot paths or scanning source for allocation-heavy and inefficient patterns. Not for measuring a…
cratis/ai · .cratis/ai/skills/binlog-generation/SKILL.md · Use when an MSBuild failure or performance investigation needs a binary log and none exists. Not for analyzing existing…
cratis/ai · .cratis/ai/skills/check-bin-obj-clash/SKILL.md · Use when multi-project or multi-targeted MSBuild builds collide in bin, obj or project.assets.json, overwrite outputs…
cratis/ai · .cratis/ai/skills/coverage-analysis/SKILL.md · Use when interpreting supplied .NET coverage evidence or an explicit coverage-collection request. Not for hypothetical…
cratis/ai · .cratis/ai/skills/cratis-application-react-specifications/SKILL.md · Write specifications for the React and TypeScript surface of a Cratis application slice — view models, helpers, command…
cratis/ai · .cratis/ai/skills/cratis-application-slice-conformance/SKILL.md · Reconcile a Cratis slice's hand-written or gap-filled code and specifications with its contract (the `.play` slice and…
cratis/ai · .cratis/ai/skills/cratis-application-slice-specifications/SKILL.md · Specify the backend behavior of an event-sourced Cratis application slice — plain-call specs for pure decisions, plus…
cratis/ai · .cratis/ai/skills/cratis-arc-authentication-authorization-and-identity/SKILL.md · Wire authentication, authorization and identity in a Cratis Arc application — IProvideIdentityDetails and the…
cratis/ai · .cratis/ai/skills/cratis-arc-command-execution/SKILL.md · Execute an existing Cratis Arc command from backend code through ICommandPipeline — the scopeless and scoped overloads…
cratis/ai · .cratis/ai/skills/cratis-arc-command-kotlin/SKILL.md · Define a Cratis Arc command in Kotlin or Java — the @Command class, its handle() method, the optional provide() step…
cratis/ai · .cratis/ai/skills/cratis-arc-command-operation/SKILL.md · Declare immediate inline work as a Cratis Arc ICommandOperation returned by a model-bound command, with optional…
tencentcloudbase/cloudbase-ai-toolkit · connectors/cloudbase-intl/skills/references/ui-design/SKILL.md · Use when users need visual direction, interface hierarchy, layout decisions, design specifications, or prototypes…
tencentcloudbase/cloudbase-ai-toolkit · config/source/skills/ui-design/SKILL.md · Use when users need visual direction, interface hierarchy, layout decisions, design specifications, or prototypes…
tencentcloudbase/cloudbase-ai-toolkit · plugin/cloudbase/skills/ui-design/SKILL.md · Use when users need visual direction, interface hierarchy, layout decisions, design specifications, or prototypes…
tencentcloudbase/cloudbase-ai-toolkit · config/.claude/skills/ui-design/SKILL.md · Use when users need visual direction, interface hierarchy, layout decisions, design specifications, or prototypes…
infometa/workbuddyskills · connectors/cloudbase/skills/references/ui-design/SKILL.md · Use when users need visual direction, interface hierarchy, layout decisions, design specifications, or prototypes…
