That is really cool! Thank you Ruben, @RbnJrg!
I don't need to stick to epub3. I though it was more recent, with more features
You're right, text to path fixes everything on Kobo.
Even img with width is working now:
Code:
<img width="100%" alt="drawing" src="../Images/drawing2.svg"/>
I wonder if it also work on other e-reader? I only have a Kobo and I use Linux.