2.1.100 [W3C-HTML51] Section 6.7.6 Page load processing model for media

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V0256: Audio and video media are not loaded into a Document; instead a download is attempted

The specification states:

 ... Page load processing model for media
  
     When an image, video, or audio resource is to be loaded in a browsing context, the 
     user agent should create a Document object, mark it as being an HTML 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 element host element for the media, as 
     described below, to the body element, and set the appropriate attribute of the 
     element host element, as described below, to the address of the image, video, or 
     audio resource.

EdgeHTML Mode

Audio and video media are not loaded into a Document; instead a download is attempted.