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There was nothing like this before ;) But seriously - I ever missed a possibility to check the "richness of semantic" of a html document. Some things are possible with the Web Developer Toolbar, but Semantic Checker concentrates on semantic topic only and is doing this imho in a very usable way.
For the future I'm planning highlighting of HTML5 elements (right now, there are only HTML4 elements highlighted). Other candidates are WAI-ARIA roles and attributes as well as Microformats. All visualized by different colors. An overview will present some statistics of all of these elements.
|User since||July 22, 2008|
|Number of add-ons developed||3 add-ons|
|Average rating of developer's add-ons||Rated 4 out of 5 stars|
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