Covers the following TinyMCE API:
style_formats
TinyMCE includes a default button which makes it possible to create UI for assigning custom inline text styles. This button (which renders as a dropdown) then appears in its registered position in the TinyMCE toolbar.
From #12, the following screenshot depicts a style select dropdown that allows for different inline text markup:
Please open a new issue to suggest additional examples of existing usage.
While Gutenberg's implementation of the Classic Block will include the style select dropdown, there isn't a way to offer an equivalent experience for other rich-text editing experiences.
See these issues for related conversation: