Jim Jewett <jimjjew...@gmail.com> added the comment:

The standard itself says that it only applies to content served over http; if 
the content is retrieved by ftp or from a file system, then you should trust 
that.  I don't notice that in the code you pointed to.

So maybe filetype is the right answer if the data isn't coming over the 
network?  For whatwg demonstration code, it is reasonable to assume that, but 
in python -- at a minimum, you should document the assumption prominently in 
the docs and docstring.

----------
nosy: +Jim.Jewett

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<https://bugs.python.org/issue40841>
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