How to set '-unity-font-definition' to 'None' in uss file?

Hi, I am trying to use UIE in my new project. I like to dynamically generate UI controls from configuration data + c# code. Font and Font Asset in Text interfered with my work when I inherited Button and encapsulated it as a new base control, Font Asset will be assigned an initial Asset, which will cause Font assignments to fail.

But assigning '-unity-font-definition' in USS causes an new exception (I've tried the string None, assigning it directly to None or null, neither of which prevents an exception from being raised)


That's all I could find https://docs.unity3d.com/Manual/UIE-USS-SupportedProperties.html

What do I need to do to properly assign this property to None like the document at runtime ？
Thank you all

 

thank you for your help！

 

@SimonDufour Maybe I missed something, but how do you actually set the USS property to "None" (as mentioned in the docs) from the USS style file?