Clam and others supported by 95.8% of browsers globally:
Clamp is in CSS Values Level 4:
https://www.w3.org/TR/css-values-4/
And they already started working on CSS Values Level 5:
https://www.w3.org/TR/css-values-5/
While the W3C tends to be cautious in its process, the likelihood of changing syntax is slim to none. It's worth noting that Mediawiki doesn't necessarily need to implement this; it just needs to allow it in the CSS sanitizer. Therefore, there's no reason to hold back.
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4