CSS Extensions can be used to enhance the functionality of the web pages. The following table lists down some of the CSS extensions used in SASS:
| CSS Extension | Description |
|---|---|
| Nested Rules | It is a way of combining multiple CSS rules within one another. |
| Referencing Parent Selectors | It is the process of selecting parent selector by using the & character. |
| Nested Properties | It allows nesting of properties into other properties which leads to grouping of another related code. |
| Placeholder Selectors | Sass supports placeholder selector using class or id selector by making use of @extend directive. |