css.properties.clip.auto fails in Firefox 1.0 although it's supported

See: https://github.com/mdn/browser-compat-data/pull/26333#discussion_r2020645618

<img width="1086" alt="image" src="https://github.com/user-attachments/assets/35a33fd3-4205-4283-a86f-a79000ac4858" />
