It is scrolled fully into view within its parent container, if any.
如果有父容器的话，则该点可完全卷动至检视内。
If a container is not specified, its element's parent is set as the container.
如果没有父容器被指定，默认它的父对象被指定为它的容器。
If a container is not specified, its element's parent is set as the container.
如果没有父容器被指定，默认它的父对象被指定为它的容器。
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