`scroll-marker-group` CSS property flagged as 'Unknown property'

[mikeygough]

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

• VS Code Version: 1.101.0 (Universal)
• OS Version: macOS Sequoia Version 15.5

Steps to Reproduce:

1. Disable all VSCode extensions. This bug is not related to extensions.
2. Create a .css file.
3. Try to apply the scroll-marker-group property to an element. For example:
   ul {scroll-marker-group: after;}
4. Note the blue squiggly highlighting and VSCode error
   Unknown property: 'scroll-marker-group' css(unknownProperties)
5. scroll-marker-group is indeed a valid property. The scroll-marker-group property is used to control whether a scroll container has a ::scroll-marker-group pseudo-element generated. This bug was identified while following the MDN tutorial for creating a CSS carousel.

[vs-code-engineering]

Thanks for creating this issue! It looks like you may be using an old version of VS Code, the latest stable release is 1.101.1. Please try upgrading to the latest version and checking whether this issue remains.

Happy Coding!

[mikeygough]

FYI, updated my version to the latest but am experiencing the same error.