Ionic CSS attributes are deprecated

Upgrading to 4.10.0 I am getting the following CSS error:

[DEPRECATED][CSS] Ionic CSS attributes are deprecated.

This a major change and it has not been documentated in the changelog as a breaking change. Very frustrating, can anyone else confirm this breaking change has occured in 4.10.0??

It’s not a “breaking change” nor an error, it’s a deprecation warning.

It’s a warning that a breaking change will happen in future, and a chance for you to fix it before it happens.

What version did you have, before of the upgrade?