Learn LIT with Real Code Examples

Lit allows developers to create reusable components using standard web components.

It provides reactive properties and declarative templates to make UI updates efficient.

Lit focuses on minimal JavaScript overhead while supporting rich interactivity.

Custom Elements integration

Shadow DOM encapsulation

Reactive property system

Declarative rendering

Event binding & lifecycle hooks

LitElement base class

Reactive properties and state

Shadow DOM encapsulation

HTML templating with lit-html

CSS styles scoped to component

src/components - Lit components

src/styles - shared styles

index.html - main entry

package.json - dependencies

tsconfig.json - optional TypeScript support

Define a LitElement subclass

Add reactive properties

Create render() template with `html`

Attach scoped styles

Use component in HTML or other frameworks

Beginner: simple button component

Intermediate: interactive form components

Advanced: reusable widget libraries

Expert: large design systems

Community: open-source web components

More lightweight than React or Vue

Standards-compliant vs framework-specific

Better for reusable components than Angular

Faster runtime updates

Smaller ecosystem than major frameworks

2019 – Lit 2.0 initial release

2020 – Improved reactive system & TypeScript support

2021 – Scoped styling & Shadow DOM improvements

2022 – Expanded tooling & Open-WC integration

2025 – Modernized reactive updates and ecosystem growth

LitElement: Base class for components

Reactive properties: Data-bound properties that trigger updates

Shadow DOM: Encapsulated DOM for components

lit-html: Tagged template literal for declarative rendering

Custom elements: Standard web components