What is webcomponentsjs?

yyx990803/webcomponentsjs — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2015-02-24

★ 3JavaScriptAudience · developerComplexity · 2/5Dormant

Mindmap

mindmap
  root((repo))
    What it does
      Polyfills Web Components
      Custom Elements support
      HTML Imports support
      Shadow DOM isolation
    Tech stack
      JavaScript
      Node.js build tools
      Gulp
    Use cases
      Support older browsers
      Support Internet Explorer 11
      Drop-in prebuilt bundle
    Audience
      Frontend engineers
      Web Components developers
    Variants
      Full version
      Lite version no Shadow DOM

mindmap root((repo)) What it does Polyfills Web Components Custom Elements support HTML Imports support Shadow DOM isolation Tech stack JavaScript Node.js build tools Gulp Use cases Support older browsers Support Internet Explorer 11 Drop-in prebuilt bundle Audience Frontend engineers Web Components developers Variants Full version Lite version no Shadow DOM

What do people build with it?

USE CASE 1

Load the polyfill bundle so custom HTML elements work correctly on older browsers like Internet Explorer 11.

USE CASE 2

Use the lite version when a project only needs Custom Elements and HTML Imports without Shadow DOM overhead.

USE CASE 3

Build the polyfills locally with Node.js and gulp for a customized bundle instead of the prebuilt files.

USE CASE 4

Ensure consistent Web Components behavior across desktop and mobile versions of Chrome, Firefox, and Safari.

What is it built with?

JavaScriptNode.jsGulp

How does it compare?

	yyx990803/webcomponentsjs	amarjitjim/browserpilot	andershaig/cssess
Stars	3	3	3
Language	JavaScript	JavaScript	JavaScript
Last pushed	2015-02-24	—	2011-08-19
Maintenance	Dormant	—	Dormant
Setup difficulty	—	moderate	easy
Complexity	2/5	3/5	1/5
Audience	developer	developer	developer

Figures from each repo's GitHub metadata at analysis time.

Copy-paste prompts

Prompt 1

Show me how to add the webcomponentsjs polyfill to my HTML page so Custom Elements work in older browsers.

Prompt 2

Explain the difference between the full and lite builds of this Web Components polyfill and which one I should use.

Prompt 3

Help me set up a Node.js and gulp build to compile a customized version of this polyfill bundle.

Prompt 4

Write a Custom Element that relies on Shadow DOM and works correctly once this polyfill is loaded.

Frequently asked questions