This script is the defacto way to enable use of HTML5 sectioning elements in legacy Internet Explorer.
Sleek, intuitive, and powerful mobile first front-end framework for faster and easier web development.
Open graph description entity tag
Sites who has this tag are verfied by google to use WebMaster tools
The http-equiv attribute provides an HTTP header for the information/value of the content attribute. The http-equiv attribute can be used to simulate an HTTP response header.
A canonical link element is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical", or "preferred".