hidden ·.inner-hidden 元素：因為沒有在此元素設定 visibility: visible ，所以元素為不可見的 ·.inner-visible 元素：也就是畫面中的紅色矩形，因為有在 ... ... <看更多>

With visibility:hidden the object still takes up vertical height on the page. With display:none it is completely removed. If you have text ... ... <看更多>

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visibility :visible on a child can make content visible inside a visibility:hidden ancestor. If the ancestor chain to which visibility:hidden ... ... <看更多>