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# Types
[data](https://github.com/mdn/data/blob/main/css/types.json) |
[schema](https://github.com/mdn/data/blob/main/css/types.schema.json)
[CSS basic data types](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Types) define the kinds of values (keywords and units) accepted by CSS properties and functions.
## Structure for types
A type object looks like the following example.
```json
"length": {
"groups": [
"CSS Types"
],
"status": "standard"
},
```
The 2 properties are both required.
* `groups` (array of strings): CSS is organized in modules like "CSS Types" or "CSS Color". MDN organizes features in these groups as well — `groups` should contain the name of the module(s) the type is defined in.
* `status` (enum string): This is either `standard`, `nonstandard`, `experimental` or `obsolete` depending on the standardization status of the feature.
There is another property that is optional:
* `mdn_url` (string): a URL linking to the type's page on MDN. This URL must omit the localization part of the URL (such as `en-US/`).
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