Rating: 4 stars

If you run a post URL through the W3C validator, it shows that this plugin modifies the code creating invalid HTML (I used HTML5).

Once this is corrected, I’m gonna be a huge fan.

Rating: 5 stars

This is a very simple plugin that does exactly what it says it will do. Once installed, it adds the Schema.org Article markup properties suggested by Google to qualify your content for the In-Depth Articles feature box in serach.

It requires no intervention on the user’s part, but allows customization of Headline, Alternative Headline, and Description if desired.