Hello Kevin, I recently had time to review this issue and I created a new MRE. It's a Gradle project but it has no dependencies as requested, there are just two resources a .ttf font that has some font icons and a CSS for the custom control user agent.
This time nothing works except for inline style (with setStyle()), I don't know if I'm doing something wrong or it's a bug to be honest The project is here: https://drive.google.com/file/d/1oaUawMqg0QYcMmokYyocpFkBzutPNMLR/view?usp=sharing
