The Widget-style of a menuItem in its link when the menu is selected

This impact the menu style.
When a widget-style is defined at the menuItem level, and the menuItem is selected, the widget-style of the item is pushed in the link level of the menuItem.

Adrian explain that :

In the "old days" screen widgets had styles assigned at a very granular level. Around 2007 or so, that was changed so only a widget's container (an HTML <div> for example) was styled, and the elements it contained were styled with descendent CSS selectors (CSS inheritance).

You can see that concept at work here:

https://cwiki.apache.org/confluence/display/OFBADMIN/HTML+and+CSS+Best+Practices

"...styles should be applied to containers, and the container's style should style all of the elements it contains."

and here:

https://cwiki.apache.org/confluence/display/OFBIZ/OFBiz+maincss.css+HTML+Element+Collection+Styles

Don't assume the widget code is correct. It may be in need of an update.