Why does Google Testing Tool use the “id” attribute to generate a URL for the Microdata item?

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This is strange.

It’s definitely not conforming to the Microdata Note. Apart from Microdata’s itemref attribute, HTML5’s id attribute has no special meaning in Microdata.

If Google wants to use the id value anyway, they should at least generate the URL with a fragment identifier, i.e., http://www.example.com/#foobar.

My guess is that they are (probably unintentionally) handling HTML5’s id attribute the same way as Microdata’s itemid attribute. If using itemid instead of id in your example, Google’s Testing Tool output is the same, but this time correct.

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