[css] Unknown property: 'overscroll-behavior'

[nicolashenry]

• VSCode Version: 1.21.1
• OS Version: Windows 7

Steps to Reproduce:

1. Open a css file
2. Add overscroll-behavior property somewhere :

.my-selector {
    overscroll-behavior: contain;
}

3. Warning occurs: Unknown property: 'overscroll-behavior'

Does this issue occur when all extensions are disabled?: Yes

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• [css] add backdrop-filter (experimental) (#27204)