# OfficeDev/office-ui-fabric-core

The front-end CSS framework for building experiences for Office and Microsoft 365.

Repository: https://github.com/OfficeDev/office-ui-fabric-core
Canonical: https://ross.abutalabs.com/products/office-ui-fabric-core
Homepage: https://developer.microsoft.com/en-us/fabric
Language: SCSS
License: NOASSERTION
License Family: other
Archived: true
Last push: 2025-01-13T20:49:27+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 1, release rhythm 8, longevity 100
- inputs: {"age_days": 4124, "days_push": 597, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3741, forks 459 (observed 2026-08-28T04:08:15.979205+00:00)

## What it is
Office UI Fabric Core is the SCSS-based front-end CSS framework implementing the Office Design Language (now branded Fluent UI) for building web experiences consistent with Office and Microsoft 365. It provides core styles such as icons, typography, fonts, colors, and grid layout, separate from the companion Office UI Fabric React component library.

## Use cases
- style an Office Add-in to match Microsoft 365 design language
- get Office-style icons, fonts, colors, and grid in a web app
- build a responsive mobile-first UI with Fluent design styles
- customize SCSS styles for a SharePoint or Office-branded site
- pair core styles with Office UI Fabric React components

## When to choose
- building Office Add-ins or Microsoft 365-integrated web experiences
- you need the Office/Fluent design language in plain CSS/SCSS without React
- you want CDN or npm-distributed core styles for icons, type, and grid

## When to avoid
- building non-Microsoft-branded apps where Fluent styling is unnecessary
- you need full UI components rather than core styles (use Office UI Fabric React / Fluent UI React)
- starting a brand-new project, since the repo is in maintenance and Fluent UI is the successor

## Facets
- artifact type: framework
- maturity: maintenance
- function: css-framework, ui-components, frontend-framework
- domain: web-development, frontend, web-design
- platform: cross-platform
- tags: scss, office-design-language, fluent-ui, microsoft-365, icons, responsive-design, office-add-ins, web-server

## Member repositories
- OfficeDev/office-ui-fabric-core (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:15.979205+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 2026-08-29T18:29:06.528334+00:00, confidence not recorded.
  - readme: https://github.com/OfficeDev/office-ui-fabric-core (fetched 2026-08-28T04:08:15.979205+00:00, sha 414c9c1eda30)
  - homepage: https://developer.microsoft.com/en-us/fabric (fetched 2026-08-29T09:23:29.987445+00:00, sha 0d374933ee99)
  - site_page: https://learn.microsoft.com/docs (fetched 2026-08-29T09:23:29.989790+00:00, sha f29800be2b9a)
  - site_page: https://www.microsoft.com/about (fetched 2026-08-29T09:23:29.991709+00:00, sha 743b30305950)
- Data as of 2026-08-30T08:39:29.467469+00:00.