Opera mini and UC Browser have partial Javascript support and do not support the three-dimensional transformation used for flexible menus, for example, using Foundation and Bootstrap frames (since these browsers are also not mentioned in the compatibility list). In addition, they donβt download gifs, you need to use svg images instead, because both compress their assets before downloading, which makes it much faster compared to other browsers.
You can check the link below for Opera Mini and UC, respectively:
https://dev.opera.com/articles/opera-mini-content-authoring-guidelines/
http://forum.ucweb.com/forum.php?mod=viewthread&tid=871055
You can fix this by detecting both browsers and fixing it using HTML with jQuery Mobile.
Hope this helps you.
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