Web Components let you create reusable, encapsulated HTML elements that work everywhere — React, Vue, Angular, or vanilla JS.
The Three Pillars
- Custom Elements: Define new HTML tags
- Shadow DOM: Encapsulated DOM and styling
- HTML Templates: Reusable markup
Creating a Custom Element
Usage
Shadow DOM Styling
Slots for Composition
When to Use Web Components
- Design system shared across frameworks
- Micro-frontend integration points
- Third-party embeddable widgets
- When you need true style encapsulation