2.1.111 [HTML5:2014] Section 5.6.7 Page load processing model for content that uses plugins

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V0257: Plugins are not loaded into a newly created document; instead a download is attempted

The specification states:

 ... Page load processing model for content that uses plugins
  
     When a resource that requires an external resource to be rendered is to be loaded in 
     a browsing context, the user agent should create a Document object, mark it as being 
     an HTML document and mark it as being a plugin document, set its content type to the 
     ... MIME type of the resource (type in the navigate algorithm), ... append an html 
     element to the Document, append a head element and a body element to the html 
     element, append an embed to the body element, and set the src attribute of the embed 
     element to the address of the resource.

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Plugins are not loaded into a newly created document; instead a download is attempted.