What is Lit?
Lit is an open-source library maintained by Google for building Web Components —
custom elements that work natively in every modern browser without a framework
runtime. Lit wraps the standard Custom Elements and Shadow DOM APIs with a small,
fast base class (LitElement), an efficient HTML templating system built
on tagged template literals, and a reactive property system that re-renders only
what actually changed.
Why Learn Lit?
Because Lit components are standard custom elements, they work in any framework
(React, Vue, Angular) or with no framework at all, making Lit an excellent choice
for design systems and shareable UI libraries. Lit ships a tiny runtime (a few
kilobytes), renders efficiently by updating only changed DOM nodes, and has
first-class TypeScript support through decorators like @property and
@customElement.
What You Will Learn in This Lit Course
This course is organized into focused lessons so you can learn step by step. You
will start with setup and your first component, then move into templates, reactive
properties, and the full lifecycle, followed by events, slots, and shadow DOM
styling. From there, you'll cover built-in directives like repeat and
classMap, reactive controllers, forms and accessibility, TypeScript
decorators, performance, server-side rendering, and finish with best practices and
interview preparation material.