Currently, elements in overflow menu toggle list are buttons, which are
- not catered to be perfectly cross-browser rendered (see missing min-height on last item
- carrying unnecessary type="button" attribute
Developer notes
The problem lies in the Icon code:
https://github.com/wikimedia/mediawiki-extensions-MobileFrontend/blob/master/src/mobile.startup/Icon.js#L128
This should only be set when the tag name is "input".
