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。

In strict doctypes, both of these require other block level elements to be inside of them.

youdao

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。

In strict doctypes, both of these require other block level elements to be inside of them.

youdao