block-level elements 块级元素 ; 内联块状元素 ; 适合对象
Block-level elements and block boxes 块级元素和块框 ; 块级元素与块盒
In strict doctypes, both of these require other block level elements to be inside of them.
在strict文档类型定义里面，要求所有其他的块级元素都在它们里面。
This includes things like setting the margins on block level elements like paragraphs, headers, and lists to the same value as (or some multiple of) the base line-height setting for the site.
这包括把类似p, header, li等块元素统一(或者部分分类)设置成站点的统一行高。
If the list item contains block-level elements, then everything up to the first block is placed in the command; after that, any non-list items are placed in an wrapper.
如果列表项包含块级别元素，则将第一个块之前的全部内容都放入命令中，此后的所有非列表项都放在包装器中。
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