1. cssimportrule api

2. cssimportrule api: href

3. cssimportrule api: layername

4. cssimportrule api: media

5. cssimportrule api: stylesheet

6. cssimportrule api: supportstext

7. css at-rule: `@import`

8. css at-rule: `@import`: `layer()`

9. css at-rule: `@import`: `supports()` as import condition

10. css at-rule: `@keyframes`: ignore `!important` declarations

11. javascript statement: import: import attributes with `assert` syntax (formerly import assertions): `assert {type: 'css'}`

12. javascript statement: import: import attributes (`with` syntax): `with {type: 'css'}`