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Microdata is a HTML5 specification for adding rich semantics to web content. This is a finer grained semantics than can be achieved with the semantic tags used by HTML itself. Microdata is designed to provide machine-readable labels to allow scripts to provide services that are customized to the page, or enable content from a variety of sources to be processed by a single script in a consistent manner. Microdata supports the use of vocabularies to define name-value pairs to assign values to properties.
You may define your own vocabularies for your own purposes or use one of the publicly available vocabularies, such as those at schema.org. Currently, none of the major browsers support microdata natively. Other than private uses, the only current real-world usage for microdata is Google's support for microdata in their search engines. Google operates a page for testing microdata as part of their webmaster tools. We will take a look at this in the next movie. Microdata is a new feature in HTML5, Currently, it's used by Google to enhance indexing in its search engine.
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