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Frontend & Design
Web Components (Custom Elements)
Build framework-agnostic, reusable UI components with Web Components using Custom Elements, Shadow DOM, and HTML templates.
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Overview
Web Components are a set of web platform APIs that let you create reusable custom elements with encapsulated styles and behavior. AI agents can generate Custom Elements with Shadow DOM, define observed attributes, implement lifecycle callbacks, and create HTML templates that work in any framework or vanilla HTML.
The three main technologies are Custom Elements (define new HTML tags), Shadow DOM (encapsulated DOM and styles), and HTML Templates (`` and `` for composable markup). Your AI agent can create web components that work identically in React, Vue, Svelte, Angular, or plain HTML, making them ideal for shared design systems.
Libraries like Lit (from Google) simplify web component development with reactive properties, declarative templates, and a tiny runtime. AI agents can help you build component libraries with Lit, implement form-associated custom elements, create themeable components using CSS custom properties, and distribute components via npm for cross-framework consumption.
The three main technologies are Custom Elements (define new HTML tags), Shadow DOM (encapsulated DOM and styles), and HTML Templates (`` and `
Libraries like Lit (from Google) simplify web component development with reactive properties, declarative templates, and a tiny runtime. AI agents can help you build component libraries with Lit, implement form-associated custom elements, create themeable components using CSS custom properties, and distribute components via npm for cross-framework consumption.
Who Is This For?
- Teams building framework-agnostic component libraries
- Organizations sharing UI components across React, Vue, and Angular apps
- Developers creating embeddable widgets that work anywhere
- Engineers building design systems that survive framework migrations
Installation
Setup for Claude Code
npm install lit
# Or use vanilla Web Components — no install neededConfiguration
// my-card.ts (Lit example)
import { LitElement, html, css } from "lit";
import { customElement, property } from "lit/decorators.js";
@customElement("my-card")
export class MyCard extends LitElement {
static styles = css`:host { display: block; border: 1px solid #e2e8f0; border-radius: 0.5rem; padding: 1rem; }`;
@property() heading = "";
render() {
return html`<h2>${this.heading}</h2><slot></slot>`;
}
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