Validating Pandoc generated HTML 5

[Nandakumar Chandrasekhar <navanitachora-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Dear Folks,

I have the following question in regard to the HTML 5 generated by Pandoc.

Is Pandoc generating HTML 5 using the XHTML standard?

When validating the generated HTML through the W3C validator I see the 
following information notices about void elements:

Trailing slash on void elements has no effect 
<https://github.com/validator/validator/wiki/Markup-%C2%BB-Void-elements#trailing-slashes-in-void-element-start-tags-do-not-mark-the-start-tags-as-self-closing>
 and interacts badly with unquoted attribute values 
<https://github.com/validator/validator/wiki/Markup-%C2%BB-Void-elements#trailing-slashes-directly-preceded-by-unquoted-attribute-values>
.

Since this is just informational I am not too worried about the trailing 
slash being placed at the end of elements although it does not seem to be 
part of the HTML 5 standard.

However, when I am faced with an error like below I would like to fix it:

Error: Bad value doc-endnotes for attribute role on element aside 
<https://html.spec.whatwg.org/multipage/#the-aside-element>.
</figure>↩<aside id="footnotes" class="footnotes footnotes-end-of-document"↩
role="doc-endnotes">↩<hr />

I would like to know the community's verdict on this and how I may remove 
these messages while validating if at all possible. Many thanks

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