[BUG] ox-html output does not pass validation for html4-strict doctype [9.7-pre (release_9.6.23-1423-gcea6a1.dirty @ /home/yantar92/.emacs.d/straight/build/org/)]

[BUG] ox-html output does not pass validation for html4-strict doctype [9.7-pre (release_9.6.23-1423-gcea6a1.dirty @ /home/yantar92/.emacs.d/straight/build/org/)]

[Ihor Radchenko]

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Setting (setq org-html-doctype "html4-strict") and exporting a trivial
Org document (like the attached) to HTML fails to pass validation at
https://validator.w3.org/

The error is

 Line 6, Column 72: character data is not allowed here
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />

 ....using XHTML-style self-closing tags (such as <meta ... />) in HTML
 4.01 or earlier. To fix, remove the extra slash ('/') character. For
 more information about the reasons for this, see Empty elements in
 SGML, HTML, XML, and XHTML.

caused by /> self-closing tag.

However, dropping /> will lead to validation failing for the default
value of `org-html-doctype' - "xhtml-strict".

I am wondering whether it is at all possible to use the same syntax and
yet pass validation for all the allowed values of `org-html-doctype':
"html4-strict", "html4-transitional", "html4-frameset", "xhtml-strict",
"xhtml-transitional", "xhtml-frameset", "xhtml-11", "html5", "xhtml5".


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[-- Type: application/vnd.lotus-organizer, Size: 119 bytes --]

:PROPERTIES:
:ID:       d6de1b70-d3d9-4f6a-be94-4d23d9ed2bfc
:END:
#+title: testmath
#+date: [2024-03-22 20:59]
foobar

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Emacs  : GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41, cairo version 1.18.0)
 of 2024-03-24
Package: Org mode version 9.7-pre (release_9.6.23-1423-gcea6a1.dirty @ /home/yantar92/.emacs.d/straight/build/org/)
-- 
Ihor Radchenko // yantar92,
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/yantar92>

Re: [BUG] ox-html output does not pass validation for html4-strict doctype [9.7-pre (release_9.6.23-1423-gcea6a1.dirty @ /home/yantar92/.emacs.d/straight/build/org/)]

[Max Nikulin]

On 25/03/2024 18:18, Ihor Radchenko wrote:
> I am wondering whether it is at all possible to use the same syntax and
> yet pass validation for all the allowed values of `org-html-doctype':
> "html4-strict", "html4-transitional", "html4-frameset", "xhtml-strict",
> "xhtml-transitional", "xhtml-frameset", "xhtml-11", "html5", "xhtml5".

Is it correct to use text/html for XHTML? I would expect 
application/xhtml+xml, but it is better to check standard.

For html5 my expectation is

     <meta charset="utf-8">

instead of http-equiv
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta#charset

ox-html content-type metadata (was: [BUG] ox-html output does not pass validation for html4-strict doctype [9.7-pre (release_9.6.23-1423-gcea6a1.dirty @ /home/yantar92/.emacs.d/straight/build/org/)])

[Ihor Radchenko]

This is tangent to the original problem I described.

Max Nikulin <manikulin@gmail.com> writes:

> On 25/03/2024 18:18, Ihor Radchenko wrote:
>> I am wondering whether it is at all possible to use the same syntax and
>> yet pass validation for all the allowed values of `org-html-doctype':
>> "html4-strict", "html4-transitional", "html4-frameset", "xhtml-strict",
>> "xhtml-transitional", "xhtml-frameset", "xhtml-11", "html5", "xhtml5".
>
> Is it correct to use text/html for XHTML? I would expect 
> application/xhtml+xml, but it is better to check standard.

It is certainly not an error.

Also,
https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types#texthtml
says

All HTML content should be served with this type. Alternative MIME types
for XHTML (like application/xhtml+xml) are mostly useless nowadays.

> For html5 my expectation is
>
>      <meta charset="utf-8">
>
> instead of http-equiv
> https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta#charset

What made you think that your expectation is not fulfilled by ox-html?

-- 
Ihor Radchenko // yantar92,
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/yantar92>