Exclude @keyframes params from being parsed as a Less variable (#10773)
* Exclude @keyframes params from being parsed as a Less variable
* Update changelog_unreleased/css/10773.md
Co-authored-by: fisker Cheung <lionkay@gmail.com>
* Update changelog_unreleased/css/10773.md
Co-authored-by: fisker Cheung <lionkay@gmail.com>
* Add "keyframes" to cspell.json
Co-authored-by: fisker Cheung <lionkay@gmail.com>