Use of footnotes causes HTML5 validation error

[jonbeebe]

If footnotes are used in Markdown (which is very common), Hugo renders the anchor with rel="footnote" and this causes an HTML5 validation error:

Bad value footnote for attribute rel on element a: The string footnote is not a registered keyword.

Suggested fix is to use data-rel instead of rel. Any HTML that is generated directly by Hugo (and not from user-supplied templates) should always be valid.

[bep]

HTML5 validation error

What validator are you using?

[jonbeebe]

@bep I am using the W3C Markup Validation Service: https://validator.w3.org/#validate_by_input

This page shows the valid values for rel:
http://microformats.org/wiki/existing-rel-values#HTML5_link_type_extensions

[bep]

A fix for this was committed upstream just 3 days ago:

russross/blackfriday@55d61fa

I will verify that we're at latest BF.

[jonbeebe]

@bep Great thanks! Very fast response.

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