Merge pull request #1491 from naturalatlas/itemscope

Added support for itemscope, itemtype, itemprop attributes.

docs/ref-04-tags-and-attributes.md

@@ -64,7 +64,11 @@ scrollLeft scrollTop seamless selected size span spellCheck src srcDoc step
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 ```
 
-In addition, the non-standard `autoCapitalize` and `autoCorrect` attributes are supported for Mobile Safari, and the `property` attribute is supported for Open Graph `<meta>` tags.
+In addition, the following non-standard attributes are supported:
+
+- `autoCapitalize autoCorrect` for Mobile Safari.
+- `property` for [Open Graph](http://ogp.me/) meta tags.
+- `itemProp itemScope itemType` for [HTML5 microdata](http://schema.org/docs/gs.html).
 
 There is also the React-specific attribute `dangerouslySetInnerHTML` ([more here](/react/docs/special-non-dom-attributes.html)), used for directly inserting HTML strings into a component.