@ckish3
My preferred solution would be to remove the ability to set the font size from the toolbar. Then it's up to the user to decide how big they want their font by setting it inside their browser rather than the teacher deciding how big it should be. As hard as Canvas makes it to change things to improve accessibility, this is one area they make too easy to change. And specifying a point size is a bad thing to do anyway, it should be a relative size.
I have a script that I run on my content pages that strips out all spans, non-breaking spaces, and does does some other cleanup that shouldn't be an issue, but it is. When all of the spans are gone, all of my text is the same size.
What you might be seeing is that the font size you see when you're viewing quizzes within the quiz edit screen is not the same font the students get when taking it.
Here's what a quiz question looks like while editing the question in the quiz.

Here's what it looks like after you've saved it. Notice this is smaller.

Here's what it looks like when students take it (or the teacher previews it).

There is no need to change the font size there, it's just fine when you take it.
To do some testing, I did change the font size to 12pt for everything in the question and it turned out the same size as if I hadn't put in the 12pt. The only thing that changed was that middle section when viewing the question (but not editing it directly) and some people might want it smaller so they can see more without having to scroll as much.
This discussion post is outdated and has been archived. Please use the Community question forums and official documentation for the most current and accurate information.