vscode-csstree

Validate CSS according to W3C specs and browser implementations.

Extension highlights wrong properties and values when enabled. Just install the extension and open your CSS file. Validation will be performing in background.

CSS validator based on CSSTree as plugin for VSCode.

Extension Settings

• csstree.enable: enable/disable this extension

Other

If you want to disable VSCode's internal CSS linting then just add

"css.validate": false

to your preferences.