Lit – 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.

Skip the boilerplate

Building on top of the Web Components standards, Lit adds just what you need to be happy and productive: reactivity, declarative templates and a handful of thoughtful features to reduce boilerplate and make your job easier. Every Lit feature is carefully designed with web platform evolution in mind.

Tiny footprint, instant updates

Weighing in at around 5 KB (minified and compressed), Lit helps keep your bundle size small and your loading time short. And rendering is blazing fast, because Lit touches only the dynamic parts of your UI when updating — no need to rebuild a virtual tree and diff it with the DOM.

Interoperable & future-ready

Every Lit component is a native web component, with the superpower of interoperability. Web components work anywhere you use HTML, with any framework or none at all. This makes Lit ideal for building shareable components, design systems, or maintainable, future-ready sites and apps.

Custom Elements

Lit components are standard custom elements, so the browser treats them exactly like built-in elements. Use them in hand-written HTML or framework code, output them from your CMS or static site builder, even create instances in JavaScript — they just work!

Scoped styles

Lit scopes your styles by default, using Shadow DOM. This keeps your CSS selectors simple and ensures that your component’s styles don’t affect — and aren’t affected by — any other styles on the page.

Reactive properties

Declare reactive properties to model your component’s API and internal state. A Lit component efficiently re-renders whenever a reactive property (or corresponding HTML attribute) changes.

Declarative templates

Lit templates, based on tagged template literals, are simple, expressive and fast, featuring HTML markup with native JavaScript expressions inline. No custom syntax to learn, no compilation required.

Shareable Components

Need to deliver interactive content or features that drop into any site, built on any stack? Because they’re natively supported by browsers, web components are the perfect solution — and Lit makes them easy to build.

Design Systems

A design system helps you create experiences that are consistently excellent and on brand. But what if your organization uses multiple frameworks? With Lit, you can build one set of components that works for every team.

Sites and Apps

Use Lit components to progressively enhance a static site, or build an entire app. By embracing Web Components, Lit minimizes lock-in and promotes maintainability: update or migrate one component at a time, without disrupting product development.


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