Demo ToDo app using pure vanilla Web Components, with:

• State management in the root
• Routing via History API
• <form> for input
• Nested CSS and container queries
• Nested components: todo-list and todo-form with input/output events
• LocalStorage "backend" with simulated 400ms delay
• Uses Baseline 2025 features: container queries, declarative shadow DOM, etc.

• Add, edit, delete todos
• Routing: / (list), /add, /edit?id=...
• All code is modern, no framework, just native browser features

Open index.html directly in a modern browser (Chrome, Edge, Firefox, Safari 2025+).

• index.html — Entry point
• app-root.js — Application root, routing, state
• todo-list.js — List component
• todo-form.js — Form component

• Nested selectors
• Container queries (works in Baseline 2025)
• CSS variables

• Data is stored in LocalStorage.
• Fake backend delays (400ms) for all mutations.