# scottjehl/Respond

A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)

Repository: https://github.com/scottjehl/Respond
Canonical: https://ross.abutalabs.com/products/respond
Language: JavaScript
License: MIT
License Family: permissive
Archived: true
Last push: 2018-03-16T09:38:34+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 5686, "days_push": 3092, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 11207, forks 3254 (observed 2026-08-28T04:10:46.425494+00:00)

## What it is
Respond.js is a fast, lightweight JavaScript polyfill that adds min/max-width CSS3 Media Query support to browsers lacking it, primarily Internet Explorer 6-8. It enables responsive web designs in legacy browsers by fetching CSS via AJAX and translating media queries.

## Use cases
- support responsive layouts in internet explorer 8
- polyfill css3 media queries for legacy browsers
- make mobile-first responsive design work in ie6-ie8
- enable min-width and max-width media queries in old ie
- serve responsive css to browsers without media query support

## When to choose
- you must support IE 8 or older browsers that lack CSS3 media query support
- you need a tiny (1kb gzipped) dependency-free polyfill for responsive breakpoints
- you are maintaining a legacy site with mobile-first responsive CSS

## When to avoid
- your target browsers natively support CSS3 media queries (all modern browsers)
- you need media query features beyond min/max-width
- your stylesheets are on a CDN and you cannot set up a local proxy for cross-domain AJAX
- you are starting a new project - IE 6-8 support is obsolete

## Facets
- artifact type: library
- maturity: abandoned
- function: css-framework, browser-extension
- domain: web-development, frontend, cross-platform
- platform: browser
- tags: css3-media-queries, responsive-web-design, internet-explorer, polyfill, legacy-browser-support, web-server

## Member repositories
- scottjehl/Respond (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:46.425494+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:16:27.421998+00:00, confidence not recorded.
  - readme: https://github.com/scottjehl/Respond (fetched 2026-08-28T04:10:46.425494+00:00, sha 034deceef41c)
- Data as of 2026-08-30T08:39:29.467469+00:00.