Last modified: 2014-02-28 23:41:48 UTC
Although it can't be used in articles, it is widely used elsewhere, including userpages. If you try and VEdit https://en.wikipedia.org/w/index.php?title=User:Elitre_(WMF)/Sandbox&oldid=573626556 you'll notice that this reflects in reference numbering being incorrect, since the ones in the divbox will be ignored. Thanks.
My previous comment was related to a page containing <div style="{{divstyleamber}}">Content.</div>, which can not be edited.
Another issue: <<Open a page with {{divbox|amber|test|Test content.}} Click on the divbox, open the template dialogue. Click on "apply changes". Divbox disappears.>> If you want to test this, VEdit https://en.wikipedia.org/w/index.php?title=User:Elitre_(WMF)/Sandbox&oldid=573628652 .