I'm trying to use the website's review function on my Android device. Right now, I have to set default fonts to Unicode fonts that include CJK characters. This works with the Anki application as well as many different websites.
It seems that the Reviewing the Kanji website here, however, uses a set font for all kanji and thus all kanji display as boxes for me. Is there some solution for this? I guess the easiest would be to use the same font that you use for displaying kanji.
EDIT: For anyone else having this issue, replace the DroidSerif and DroidSerif Bold fonts with a unicode serif of your choice. Issue resolved.