r

abstract var r: R?(source)

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2020.

Syntax: <length> | <percentage>

Initial value: 0

| Chrome | Firefox | Safari |  Edge  | IE  |
| :----: | :-----: | :----: | :----: | :-: |
|   43   |   69    |   9    |   79   | No  |