Modernizr/Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser. observed · 2026-08-28
Health v2 · maintenance only
66/100
- Activity 97
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 6186
- days_rel: n/a
- days_push: 21
- n_releases_24m: 0
Adoption not part of the score
25694 stars · 2926 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
Modernizr is a JavaScript library that detects which HTML5 and CSS3 features are supported in the user's browser. It exposes results as properties on a global Modernizr object and as CSS classes on the html element, enabling progressive enhancement.
Use cases
- detect html5 and css3 feature support in the browser
- apply css fallbacks for unsupported browser features
- progressively enhance pages based on browser capabilities
- check if webgl, canvas, or svg is available at runtime
- write conditional javascript for older browsers
When to choose
- you need granular, per-feature browser capability detection
- you support legacy browsers and want progressive enhancement
- you want feature classes on the html element for css styling
When to avoid
- you only target evergreen modern browsers and use native CSS feature queries
- you need a full polyfill library rather than detection
- you rely on the outdated modernizr.com website instead of npm builds
Facets
library · maturity maintenance
ui-components developer-tools frontend web-development browser-extensions browser feature-detection html5 css3 progressive-enhancement browser-compatibility nodejs javascript
2 sources
- readme: https://github.com/Modernizr/Modernizr · fetched 2026-08-28 · 4f88f5237027
- registry_npm: https://registry.npmjs.org/modernizr · fetched 2026-08-29 · bbb31d7bfe70
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| Modernizr/Modernizr | main | 66 |
For agents
markdown · JSON · MCP: product_card(name="Modernizr/Modernizr")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem