Hi David,

> Hello. While at one time org XHTML output validated successfully, now the default values of certain variables in ox-html cause the resulting
> output to not validate as XHTML 1.0 Strict.
>
> org-html-infojs-template: script tag attribute “type” is required (2x)
> org-html-style-default: style tag attribute “type” is required
>
> Also the following output gives the error “there is no attribute ‘role’”.
>
>  <div id=“table-of-contents” role=“doc-toc”>
>
> The same for this output:
>
>  role=“doc-backlink”

There seem to be known difficulties combining HTML5 ARIA attributes (like `role')
and XHTML. There seem to be a few pages with information about this, such as
<https://www.powermapper.com/blog/w3-aria-why-doesnt-it-validate/>.

All the best,
Timothy

-- 
Timothy (‘tecosaur’/‘TEC’), Org mode contributor.
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/tec>.