!!! Overview
[{$pagename}] is part of WHATWG's [HTML] living specification that provides another way to embed microformats and poshformats vocabularies, and has been superseded by [microformats].

[{$pagename}] was explicitly dropped by the [W3C] (and therefore not part of [W3C] [HTML5]) due to a lack of interest by anyone to edit the spec and keep it up to date

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]