In current versions of Moodle, feedback displayed in the little feedback popup window in the Cloze-type questions is strictly limited to text. There is also a problem with displaying quotes, e.g. a feedback message such as Yes, this comes from the Greek word "pyros", for fire. will simply not show up at all in the popup window.
I am suggesting the following hack, which makes it possible to display in the feedback window:
- a) all kind of HTML formatting: images, colors, fonts, etc.
- b) double quotes, single quotes and apostrophes are all changed to their smart quotes equivalent, to avoid crashes.
If you want to try out the hack on a test installation, see bug report #MDL-6377.
If you want to see exactly what it looks like, go to my Moodle test site, log into Course 101 as user moodler, password moodler, go to Sample quizzes -> Quiz What is Moodle? - Cloze.
Hope that helps,
Joseph