Re: id attributes for header elements

[Per Bothner]

On 12/26/21 10:29, Patrice Dumas wrote:
> On Sun, Dec 26, 2021 at 10:08:50AM -0800, Per Bothner wrote:
> > I don't remember, and I don't see how it could be better for navigation..
>
> It was some time ago, at least some people expected the link to point to
> the start of the header, and not to the heading command.

I don't know of a browser which would show a user-visible difference
between navigating to an element vs navigating to an empty element just
before the element.  (And if there were a difference, perhaps some
high-lighting the navigated-to element, I think navigating to a heading
command would be better than nagivating to the empty element.)

I believe putting the link on the sectioning command is slightly better (more
semantically meaningful and easier to work with) than putting it before
- and it is never worse.

> In my view, the @anchor{Electron} is not associated to the @subheading (except
> for being before).  The @subheading has its own id as an heading not
> associated to a Texinfo element.

My point is that at least the id for the @subheading should be on the generated 
heading.

I.e.

@subheading Element

should generate:

<h4 id="Electron">Electron</h4>

It feel wrong to generate a separate empty <span> in this case.
It may be reasonable to do so for @anchor - but not for a @subheading.

> In a case like
>
> @node My node
> @section Section
>
> note that there is no id output especially for the sectionning command,
> it is the id of the "element" (also called a tree unit) that encompasses
> a unit of Texinfo.  In general it corresponds to a @node + sectioning
> @-command + associated content.

When there is a "tree unit" for a sectioning command, it makes sense
to put the id on the corresponding <div>.  But when we just have a @subheading,
there is no <div>.  However, there is an <h4> element that corresponds directly 
to
the @subheading.  In that case it makes sense to put the id on the h4.
--
        --Per Bothner
per@bothner.com   http://per.bothner.com/