I found that "Mediawiki:Common.js" does not affect anything on Bigforest Wiki. At first, I though it migh be a collision with server. Howeever, I replaced Common.js to that of Jayuwiki (it does work in Jayuwiki) and still it does not change anything. For example, there is no difference in the template page (틀:둘러보기 상자/핵심) (meaning Template:Navbox/core in Korean), but collapsing button does not appear on bigforst wiki (clearly Jayuwiki shows collapse contents button on Navbax above bar..) Actually, gadgets and other javascripts are almost the same so I cannot find "inteference" between scripts.. So this might be an issue of individual wiki, not universal.

How can I solve the issue?