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lit

Simple. Fast. Web Components.

Lit is a simple library for building fast, lightweight web components.

At Lit's core is a boilerplate-killing component base class that provides reactive state, scoped styles, and a declarative template system that's tiny, fast and expressive.

Documentation

See the full documentation for Lit at lit.dev

Overview

Lit provides developers with just the right tools to build fast web components:

A fast declarative HTML template system
Reactive property declarations
A customizable reactive update lifecycle
Easy to use scoped CSS styling

Lit builds on top of standard web components, and makes them easier to write:

import {LitElement, html, css} from 'lit';
import {customElement, property} from 'lit/decorators.js';

// Registers the element
@customElement('my-element')
export class MyElement extends LitElement {
  // Styles are applied to the shadow root and scoped to this element
  static styles = css`
    span {
      color: green;
    }
  `;

  // Creates a reactive property that triggers rendering
  @property()
  mood = 'great';

  // Render the component's DOM by returning a Lit template
  render() {
    return html`Web Components are <span>${this.mood}</span>!`;
  }
}

Once you've defined your component, you can use it anywhere you use HTML:

<my-element mood="awesome"></my-element>

Contributing

Please see CONTRIBUTING.md.