In this way, you can add content from other document models inside this element, thus extending the types of elements allowed overall in the document-albeit in a specific location.

这样，您可以将来自其他文档模型的内容添加到这个元素中，从而扩展这个文档所允许的总体元素类型—尽管是在一个特定的位置。

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Element types with mixed content are allowed to hold either character data alone or character data interspersed with child elements.

包含混合内容的元素类型可以单独存放字符数据，也可以将字符数据与子元素混合存放。

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This behavior has allowed publishers to understand the types of content their readers appreciate most and is poised to help those publishers negotiate more meaningful relationships with relevant advertisers.

FORBES: How Sharing Will Transform Online Advertising