User blog comment:DaNASCAT/Technical Update: September 26, 2016/@comment-29896437-20160927121027/@comment-126761-20160927172626

Unfortunately, the Wii U browser is not supported here - it's used so rarely that it's not something we can justify testing against. That said, please do feel free to send in a bug report to Special:Contact/bug - we can look into it further. (It could end up being really easy to fix, though I can't make any promises.)