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。
You can either keep the information as attributes or as a set of child elements.
可以将这些信息保存为属性，也可以保存为一组子元素。
You can either keep the information as attributes or as a set of child elements.
可以将这些信息保存为属性，也可以保存为一组子元素。
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