Given an element that has a HTML Data Attributes defined on it: <div data-type="info">
It is possible to use CSS to target the element by:
Presence of the data attribute: div[data-type]
When the data attribute has a particular value: div[data-type="info"]
The latter allows for customisation based on a certain property being set - such as if this attribute was info or warning. It is a nice Vanilla JS solution that could be combined with Web Components to provide similar functionality to customisation based on React properties.