You make a good point. The question about an HTML editor has come up a few times (see HTML View, HTML editor would be really useful, and Issues/Quirks/Requests Encountered). In one of these threads, Kevin with Instructure suggested that this functionality would be built following general availability. Like you I look forward to this being added!
All the best---
I agree it's a problem and hope it gets fixed soon!
It's up to you what size you want, based on your specific need. For most media, I like to use width="100%" height="550". The width="100%" will make it responsive and the height="550" seems to take up an appropriate amount of space in most situations. If you're using a stimulus item, it would take up half your screen and your real estate is very valuable, so I'd probably start with width="100%" height="300". You could then adjust the height based on the aspect ratio of your particular item by deleting it and then recreating it.
I need to add a piecewise function and that was only done through the HTML code. Does anyone know how to add that in quizzes.next? It's not in the math equation template, so I'm at a loss.
I do not use many Quizzes.Next quizzes in my courses, but I do assist teachers that do. Every time they have questions, I usually try to troubleshoot or help via the HTML Editor. But here I am, years after it's conception, not able to do so. Very frustrating! I was trying to do some accessibility with a table and couldn't really do so with the RCE. I can't wait for this feature.