This may be useful when you try to restrict user actions or control the appearance of the document while it is embedded. 當您嘗試限制用戶(hù)操作或者它是嵌入時(shí)控制文檔外觀(guān)這可能很有用。
The best way to use markup to control the appearance of your documents is to concentrate on the content of the document, not on its final appearance. 用標記來(lái)控制文檔外觀(guān)的最好方法，就是把精力集中在文檔內容本身，而不是它最終看上去的樣子。
