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# MDN CSS data
This folder contains data about the different features of the [CSS](https://developer.mozilla.org/en-US/docs/Web/CSS) language.
## How to update the CSS JSON DB
A guide to making changes is provided in the [How to update the CSS JSON DB](../docs/updating_css_json.md) document.
## Different types of CSS data
The CSS data is split into these parts:
- **at-rules**:
[data](https://github.com/mdn/data/blob/main/css/at-rules.json) |
[schema](https://github.com/mdn/data/blob/main/css/at-rules.schema.json) |
[docs](https://github.com/mdn/data/blob/main/css/at-rules.md)
- **functions**:
[data](https://github.com/mdn/data/blob/main/css/functions.json) |
[schema](https://github.com/mdn/data/blob/main/css/functions.schema.json) |
[docs](https://github.com/mdn/data/blob/main/css/functions.md)
- **properties**:
[data](https://github.com/mdn/data/blob/main/css/properties.json) |
[schema](https://github.com/mdn/data/blob/main/css/properties.schema.json) |
[docs](https://github.com/mdn/data/blob/main/css/properties.md)
- **selectors**:
[data](https://github.com/mdn/data/blob/main/css/selectors.json) |
[schema](https://github.com/mdn/data/blob/main/css/selectors.schema.json) |
[docs](https://github.com/mdn/data/blob/main/css/selectors.md)
- **syntaxes**:
[data](https://github.com/mdn/data/blob/main/css/syntaxes.json) |
[schema](https://github.com/mdn/data/blob/main/css/syntaxes.schema.json) |
[docs](https://github.com/mdn/data/blob/main/css/syntaxes.md)
- **types**:
[data](https://github.com/mdn/data/blob/main/css/types.json) |
[schema](https://github.com/mdn/data/blob/main/css/types.schema.json) |
[docs](https://github.com/mdn/data/blob/main/css/types.md)
- **units**:
[data](https://github.com/mdn/data/blob/main/css/units.json) |
[schema](https://github.com/mdn/data/blob/main/css/units.schema.json) |
[docs](https://github.com/mdn/data/blob/main/css/units.md)
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