# jquery/sizzle

A sizzlin' hot selector engine.

Repository: https://github.com/jquery/sizzle
Canonical: https://ross.abutalabs.com/products/sizzle
Homepage: https://sizzlejs.com
Language: JavaScript
License: NOASSERTION
License Family: other
Last push: 2026-01-14T16:58:46+00:00

## Health v2 (maintenance only)
Score: 51/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 62, release rhythm 8, longevity 100
- inputs: {"age_days": 6583, "days_push": 231, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6302, forks 928 (observed 2026-08-28T04:09:41.555152+00:00)

## What it is
Sizzle is a pure-JavaScript, bottom-up CSS selector engine designed to be dropped into a host library, historically serving as jQuery's selector engine. It supports virtually all CSS3 selectors with results returned in document order across a wide range of browsers.

## Use cases
- add CSS selector querying to a custom JavaScript library
- support CSS3 selectors in legacy browsers like IE7
- parse and match complex CSS selector expressions in the DOM
- build a DOM manipulation library without writing a selector engine
- query DOM elements with selectors like :not(a.b) and nested pseudo-selectors

## When to choose
- you need a standalone selector engine for a host library or legacy browser support
- you're maintaining or building on top of jQuery-era tooling

## When to avoid
- you're targeting modern browsers only - native querySelector/querySelectorAll covers this
- you need a full DOM manipulation library - use jQuery instead

## Facets
- artifact type: library
- maturity: maintenance
- function: parser, developer-tools
- domain: web-development, frontend, parsers
- platform: browser
- tags: css-selectors, dom, selector-engine, jquery, nodejs, javascript

## Member repositories
- jquery/sizzle (main) score 51

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:41.555152+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 2026-08-29T17:46:15.208606+00:00, confidence not recorded.
  - readme: https://github.com/jquery/sizzle (fetched 2026-08-28T04:09:41.555152+00:00, sha 9ff426c5a2f7)
  - homepage: https://sizzlejs.com (fetched 2026-08-29T08:43:00.398836+00:00, sha 26cd09318819)
  - registry_npm: https://registry.npmjs.org/sizzle (fetched 2026-08-29T08:43:00.409139+00:00, sha 30344acb2d64)
- Data as of 2026-08-30T08:39:29.467469+00:00.