Moodle 3.10. 
Moodle mobile 3.9.4.

When adding UI components from here, they do not work on the app.

I find this super useful as it massively helps the student UI. It would be great if they work on the app.

Reproduction:
1 - Create a page on Moodle

2- Add:

<span class="badge badge-pill badge-danger">Danger</span> 

3 - Save
4 - The text "Danger" in white with red background colour is shown
5 - Go to that page via the Moodle App and you will see that the class is ignored