borderInlineStartColor
This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
Syntax: <'border-top-color'>
Initial value: currentcolor
| Chrome | Firefox | Safari | Edge | IE |
| :----: | :---------------------------: | :------: | :----: | :-: |
| 69 | 41 | 12.1 | 79 | No |
| | 3 _(-moz-border-start-color)_ | | | |Content copied to clipboard