In Chinese, characters with a single dot on top stay separated from the rest of the character. (Eg. Chinese 宝)
In kanji, this is frequently not the case - virtually all 宀 characters I see have dots stuck to the 冖 part (宝, 字, etc.). On the other hand, there are a few kanji I've seen that don't involve 宀 and so the dots are separated: eg. 主.
Do all 宀 kanji have the dots stuck to the top? Perhaps there are kanji with both 丶 and 冖 but the two don't form a connected 宀. Do all other single dot kanji have the dots separated (like 主)?
Edit. Just found that the dots are stuck in kanji with 广 radicals. Would still like to know when the dots are stuck and when they are not stuck. Is there a rule?