I’m not confused, I’m telling you you are misguided. As an author, you can suggest a font to use. We do this all the time when building web pages by defining styles for a page, but once it reaches a user’s browser it’s in their control.

If you want more control, you will need to pick a different medium. It sounds like pdf might be what you want?

What other people see is their problem. Plenty of people don’t mind or prefer sans-serif. Ensuring your designs look the same on everyone’s machine has been a problem since the dawn of the Internet, and you aren’t going to solve it by replacing 'I’s with a special character. Worse still, if a user’s font don’t doesn’t include that character, they’ll end up with an ugly ‘�’ or something similar.

You need to decide where you lie on the control vs flexibility spectrum, because currently you want it both ways. You either make static images of text formatted exactly how you want (and adding alt text!!), or you let users view the text as they wish.

I find it really strange how you’ve been confronted with locked down text from Samsung, and your first instinct is to try to inflict that same thing on others.

I think it might be easier to use a serif font. Where are you trying to make this change? At the browser level? OS? Or somewhere else? You should be able to make that change, but the specific configuration will vary.

Dedicated single purpose machines. It’s nice to have a device that doesn’t include all of the usual distractions. For example, I have an old iPhone that only has the PBS Kids app and some pre-approved shows downloaded. Everything else has been removed, so I feel a little bit better about hanging it to a child on road trips and the like. Another old laptop has been covered into a Step Mania machine.