Web Components
Web Components is a set of native browser standards — Custom Elements, Shadow DOM, and HTML Templates — that let developers create reusable, encapsulated custom HTML tags without depending on any particular JavaScript framework.
Definition
Web Components is a set of native browser standards — Custom Elements, Shadow DOM, and HTML Templates — that let developers create reusable, encapsulated custom HTML tags without depending on any particular JavaScript framework.
Overview
Web Components emerged from a W3C/WHATWG standardization effort to give the platform itself the component model that frameworks like React and Angular had been providing at the application layer. Three specifications work together: Custom Elements let developers define new HTML tags (e.g. `<my-widget>`) backed by JavaScript classes; Shadow DOM provides style and markup encapsulation so a component's internal structure and CSS don't leak into or get overridden by the surrounding page; and HTML Templates (`<template>`) allow inert, reusable markup fragments to be cloned into the DOM efficiently. Because Web Components are a browser standard rather than a library, elements built this way work in any framework — or none — making them well suited for design systems and component libraries meant to be shared across teams using different tech stacks. Libraries like Lit and, earlier, Polymer exist to make authoring Web Components more ergonomic, adding reactive templating on top of the raw platform APIs. Web Components are widely used for embeddable third-party widgets, cross-framework design systems, and incrementally modernizing legacy applications, though most full application development still favors component frameworks like React or Vue.js for their richer state-management and ecosystem tooling.
Key Concepts
- Custom Elements for defining new, reusable HTML tags
- Shadow DOM for style and markup encapsulation
- HTML Templates for efficient, reusable inert markup
- Framework-agnostic — works in React, Vue, Angular, or plain HTML
- Native browser support without requiring a runtime library
- Composable with libraries like Lit for more ergonomic authoring
Use Cases
Frequently Asked Questions
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