LyXHTML doc doesn't pass validation

[Thibaut Cuvelier]

On Wed, 23 Mar 2022 at 20:02, Lorenzo Bertini <lorenzobertini97 at gmail.com>
wrote:

> Il 23/03/22 19:03, Thibaut Cuvelier ha scritto:
> > On Wed, 23 Mar 2022 at 18:43, Lorenzo Bertini
> > <lorenzobertini97 at gmail.com <mailto:lorenzobertini97 at gmail.com>> wrote:
> >
> >     Running a very simple LyXHTML doc (a section with a few paragraphs)
> >     against this validator https://validator.w3.org/check
> >     <https://validator.w3.org/check> reports some
> >     errors, I don't really know if we care or not:
> >
> >     1. value of attribute "dir" cannot be "auto"; must be one of "ltr",
> >     "rtl"
> >     2. element "section" undefined
> >
> >     Is this a problem? I just wanted to check if I could use the <figure>
> >     tag but its not part of the specification.
> >
> >
> > What version of HTML are you checking against? There are some glimpses
> > of HTML5 in the current output. For instance, dir="auto" and section are
> > perfectly legal in HTML5
> > (https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/dir
> > <https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/dir>
> and
> > https://developer.mozilla.org/en-US/docs/Web/HTML/Element/section
> > <https://developer.mozilla.org/en-US/docs/Web/HTML/Element/section>)
>
> I checked XHTML 1.0, as it should be what LyX outputs. I was about to
> check up some of the xhtml_output code to maybe add `figure`
> environments, but since its XHTML there's very little allowed.
>

XHTML 1 dates back from 2001... LyX generates XHTML 5, but the doctype is
kept from XHTML 1 for compatibility issues (some browsers completely change
their behaviour based on the doctype). The issue has been discussed on the
mailing list a while ago.
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