Web Components Polyfills
Web Components Polyfills observed · 2026-08-28
Health v2 · maintenance only
72/100
- Activity 88
- Release rhythm 35
- Longevity 100
Flags: no_releases
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 2694
- days_rel: n/a
- days_push: 72
- n_releases_24m: 0
Adoption not part of the score
1189 stars · 168 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
A suite of polyfills that implement the HTML Web Components specs (custom elements, shadow DOM, HTML imports) for browsers lacking native support. It is maintained in the webcomponents/polyfills monorepo after migrating from webcomponents/webcomponentsjs.
Use cases
- support web components in older browsers
- polyfill custom elements and shadow DOM
- run web components on legacy browsers like IE11
- load web components polyfills in my app
- make custom elements work without native support
When to choose
- your app must support older browsers without native Web Components support
- you use frameworks or libraries built on Web Components that depend on these polyfills
When to avoid
- you only target modern browsers with native custom elements and shadow DOM support
- you need a full UI framework rather than spec polyfills
Facets
library · maturity maintenance
ui-components frontend-framework web-development frontend browser-extensions browser web-components polyfills custom-elements shadow-dom html javascript
2 sources
- readme: https://github.com/webcomponents/polyfills · fetched 2026-08-28 · 3fe7f864312d
- homepage: http://webcomponents.org/polyfills/ · fetched 2026-08-29 · 42ea62076c69
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| webcomponents/polyfills | main | 72 |
| webcomponents/webcomponentsjs | mirror | 10 |
For agents
markdown · JSON · MCP: product_card(name="webcomponents/polyfills")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem