html output W3C Validation issue ('Bad value “top” for attribute “rel” on element “link”)

[hhsprings]

themes/basic/layout.html has wrong link rel usage:

{%- block linktags %}
    {%- if hasdoc('about') %}
    <link rel="author" title="{{ _('About these documents') }}" href="{{ pathto('about') }}" />
    {%- endif %}
    {%- if hasdoc('genindex') %}
    <link rel="index" title="{{ _('Index') }}" href="{{ pathto('genindex') }}" />
    {%- endif %}
    {%- if hasdoc('search') %}
    <link rel="search" title="{{ _('Search') }}" href="{{ pathto('search') }}" />
    {%- endif %}
    {%- if hasdoc('copyright') %}
    <link rel="copyright" title="{{ _('Copyright') }}" href="{{ pathto('copyright') }}" />
    {%- endif %}
    <link rel="top" title="{{ docstitle|e }}" href="{{ pathto(master_doc) }}" />
    {%- if parents %}
    <link rel="up" title="{{ parents[-1].title|striptags|e }}" href="{{ parents[-1].link|e }}" />
    {%- endif %}
    {%- if next %}
    <link rel="next" title="{{ next.title|striptags|e }}" href="{{ next.link|e }}" />
    {%- endif %}
    {%- if prev %}
    <link rel="prev" title="{{ prev.title|striptags|e }}" href="{{ prev.link|e }}" />
    {%- endif %}
{%- endblock %}

The value top and up is invalid for rel attribute. Please see W3CSchools, etc.

[hhsprings]

W3C Validation also reports:

info: 'Element “body” does not need a “role” attribute.'

Maybe it means verbose, so we can remove it simply, I think.

[tk0miya]

Memo: Indeed, top and up is no longer needed in HTML specification.

Tag	HTML4	HTML5
author	X	O
index	O	X
search	X	O
copyright	O	O (basically uses license instead)
top	X	X
up	X	X
next	O	O
prev	O	O

refs:

• https://www.w3.org/TR/html4/types.html#h-6.12
• https://www.w3.org/TR/html5/links.html

[tk0miya]

About "document" role, WAI-ARIA says:

Authors SHOULD set the role of document on the element that encompasses the entire document. If the document role applies to the entire web page, authors SHOULD set the role of document on the root node for content, such as the body element in HTML or svg element in SVG.

https://www.w3.org/TR/wai-aria/roles#document

It seems setting the role to the body element is good way. So I will keep it.