About

Can I Wrap? is a free, instant lookup tool for HTML element nesting rules. Type a child and a parent element, and it tells you whether the nesting is valid, invalid, or context-dependent — with explanations, code examples, and links to MDN.

Data is sourced from the HTML Living Standard and MDN Web Docs.

Features

• Nesting validation — Checks if an element can be placed inside another based on content model rules.
• Detailed explanations — Shows why a combination is valid, invalid, or depends on context.
• Code examples — Provides highlighted HTML snippets for each check.
• Content categories — Browse all HTML elements organized by their content categories (flow, phrasing, interactive, embedded, heading, sectioning).
• Popular checks — Quick access to common nesting questions like <div> inside <span> or <a> inside <button>.
• Autocomplete — Search elements by tag name or description.
• Shareable URLs — Results are reflected in the URL so you can share a specific check.
• MDN references — Direct links to MDN documentation for both elements.

Tech Stack

• Astro 6
• Tailwind CSS 4
• TypeScript

Getting Started

Prerequisites

• Node.js >= 22.12.0
• pnpm

Installation

pnpm install

Development

pnpm dev

Opens the dev server at http://localhost:4321.

Build

pnpm build

Preview

pnpm preview

Project Structure

├── public/
│   ├── favicon.svg
│   ├── og-image.png
│   └── robots.txt
├── src/
│   ├── components/
│   │   └── PixelHeart.astro
│   ├── data/
│   │   └── html-nesting.ts      # Element definitions and nesting logic
│   ├── layouts/
│   │   └── Layout.astro
│   ├── lib/
│   │   └── sponsors.ts          # GitHub Sponsors integration
│   ├── pages/
│   │   └── index.astro
│   ├── scripts/
│   │   └── checker.ts           # Client-side nesting checker
│   └── styles/
│       └── global.css
├── astro.config.mjs
└── package.json

Inspiration

This project is inspired by Can I Include? by AJ, a tool that checks whether a given HTML element can be contained within another. Can I Wrap? builds on the same idea with updated data from the current HTML Living Standard, a redesigned interface, and extended nesting logic including content categories and contextual rules.

License

MIT

Author

Built by midudev.