# compat-table/compat-table

ECMAScript compatibility tables

Repository: https://github.com/compat-table/compat-table
Canonical: https://ross.abutalabs.com/products/compat-table
Homepage: http://compat-table.github.io/compat-table/
Language: JavaScript
License: NOASSERTION
License Family: other
Last push: 2026-05-05T22:36:47+00:00

## Health v2 (maintenance only)
Score: 68/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 80, release rhythm 35, longevity 100
- inputs: {"age_days": 5992, "days_push": 120, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4507, forks 933 (observed 2026-08-28T04:08:52.549372+00:00)

## What it is
A community-maintained set of compatibility tables tracking ECMAScript (ES5, ES6, ES Next, and non-standard) feature support across JavaScript engines, browsers, compilers, and Node.js versions. Data files are built into browsable HTML pages showing which platforms support which language features.

## Use cases
- check which browsers support a specific ES6 feature
- compare JavaScript engine support for ES Next proposals
- find out if a transpiler like Babel supports a given feature
- look up Node.js support for a JavaScript language feature
- verify non-standard feature support across platforms

## When to choose
- you need authoritative, community-audited data on ECMAScript feature support across runtimes and browsers
- you are deciding whether a language feature is safe to use in your target environments
- you want to check transpiler/compiler coverage of ES6 features

## When to avoid
- you need runtime feature detection in production code (use a feature-detection library instead)
- you need compatibility data for CSS, HTML, or web APIs rather than the JavaScript language itself
- you need machine-readable API access without parsing the JS data files yourself

## Facets
- artifact type: dataset
- maturity: active
- function: developer-tools, documentation, testing
- domain: web-development, developer-tools, programming-languages
- platform: browser
- tags: ecmascript, javascript, compatibility-tables, feature-support, browser-support, es6, esnext, web-server, nodejs

## Member repositories
- compat-table/compat-table (main) score 68

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:52.549372+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 2026-08-29T18:20:22.282002+00:00, confidence not recorded.
  - readme: https://github.com/compat-table/compat-table (fetched 2026-08-28T04:08:52.549372+00:00, sha cd6ceadae115)
  - homepage: http://compat-table.github.io/compat-table/ (fetched 2026-08-29T09:06:37.523512+00:00, sha 44136fa355b3)
- Data as of 2026-08-30T08:39:29.467469+00:00.