Microdata is used to nest semantics within existing content on web pages.
Marc Noon commented
I think there should be at least a detection for schema.org artifacts... it should allow for any third party plugin to easily do stuff with those artifacts.
David Storey [MSFT] commented
Note that Microdata support was removed from both Chrome and Safari/WebKit: http://manu.sporny.org/2013/microdata-downward-spiral/
It was also dropped by Opera when they switched from Presto to Blink.
Duplicate (see before)
David Millar commented
Microdata is nice, but I don't get what there would be to support - it's just there.