If you are using the AddThis bookmarking plugin ( http://wordpress.org/extend/plugins/addthis/ ) then you need this plugin to make sure that the generated HTML by the AddThis plugin is Valid. The plugin adds the xmlns:addthis="http://www.addthis.com/help/api-spec" entry to the html head tag so that the custom attributes of the AddThis plugin are recognized properly.
Requires: 2.9 or higher
Compatible up to: 4.1.8
Last Updated: 2014-12-16
Active Installs: 200+
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