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Fetch the first and last elements from the container, if any.
(如果有的话)获取容器内的第一个和最后一个元素。
youdao
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The container and all of its child elements as a whole receive focus only once.
容器及其所有子元素整个只能接收焦点一次。
youdao
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The container and all of its child elements as a whole receive focus only once.
容器及其所有子元素整个只能接收焦点一次。
youdao