What is a material design text field?
The article seems to assume that this a well defined and well known term that needs no further introduction.
The article seems to assume that this a well defined and well known term that needs no further introduction.
Anyway, it's like crystal meth. If you don't know what it is you are winning! The advice is for people who are unlucky enough to be near it.
If you don't know what it is, you probably aren't going to accidentally use them, and aren't a target of the advice, since you would probably have to either read the spec or adopt a library that waves around being an implementation of the spec to do it.
The term is well-known and understood by the intended audience.