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+# Welcome to MDN data
+
+> **Note**
+> We are in the process of deprecating the `mdn/data` package in favor of [`w3c/webref`](https://github.com/w3c/webref).
+> If you depend on this project, let us know in our community [GitHub discussions](https://github.com/mdn/mdn-community/discussions/categories/platform).
+> Thank you.
+
+[![NPM version](https://img.shields.io/npm/v/mdn-data.svg)](https://www.npmjs.com/package/mdn-data)
+[![lint](https://github.com/mdn/data/actions/workflows/lint.yml/badge.svg)](https://github.com/mdn/data/actions/workflows/lint.yml)
+
+This repository contains general data for Web technologies and is maintained by the [MDN team at Mozilla](https://wiki.mozilla.org/MDN).
+
+## Repository contents
+
+The data in this repository is used in MDN Web Docs to build [information boxes](https://developer.mozilla.org/en-US/docs/Web/CSS/background) and [sidebar navigation](https://developer.mozilla.org/en-US/docs/Web/API/Window).
+External tools make use of this data as well, for example, the [CSSTree](https://github.com/csstree/csstree/) CSS parser.
+
+There's a top-level directory for each broad area covered: for example, `api` and `css`.
+Inside each of these directories is one or more JSON files containing the data.
+
+### api
+
+Contains data about Web APIs:
+
+- API inheritance (interface inheritance and mixin implementations)
+
+### css
+
+Contains data about:
+
+- CSS at-rules
+- CSS functions
+- CSS properties
+- CSS selectors
+- CSS syntaxes
+- CSS types
+- CSS units
+
+For more information, see the [CSS data](./css/README.md) documentation and the [Updating CSS JSON DB](./docs/updating_css_json.md) guide.
+
+### l10n
+
+The l10n folder contains localization strings that are used in the various
+json files throughout this repository.
+
+## Problems?
+
+If you find a problem, please [file an issue](https://github.com/mdn/data/issues/new).
+
+## Contributing
+
+We're very happy to accept contributions to this data.
+Please familiarize yourself with the schema for the data you're editing, and send us a pull request.
+See the [CONTRIBUTING.md](./CONTRIBUTING.md) document for more information.
+
+## See also
+
+- [https://github.com/mdn/browser-compat-data](https://github.com/mdn/browser-compat-data)
+  for compatibility data for Web technologies