[docutils:feature-requests] #108 "title" option for the "image" directive

If at all, an attribute/option to-be-translated to the HTML "title" attribute would come under a different name ( maybe "tooltip"):

* Looking at its [description in the HTML standard](https://html.spec.whatwg.org/multipage/dom.html#the-title-attribute), the title attribute is misnamed. It contains "advisory information" presented as a tooltip (if at all). 
* It can easily be confused with the HTML [`<title>` element](https://html.spec.whatwg.org/multipage/semantics.html#the-title-element).
* In  Docutils, there is already a ["title" attribute](https://docutils.sourceforge.io/docs/ref/doctree.html#title-1): Used on the `<document>` element for the "metadata title" (which corresponds to the HTML `<title>` element!

In HTML, "title" is one of the common attributes, supported by (almost) all elements. Where should Docutils/rST support stop?

The LaTeX package "pdfcomment" provides a `\pdftooltip` macro that may be used for
pop-ups in PDF output. Like the HTML "title" attribute, it may be used on paragraphs, tables, footnotes references...

However, whether support for an attribute you should not rely on is a valuable addition for a lightweight markup language remains questionable, especially as for the rare use cases exist workarounds in form of CSS rules or "raw" HTML.

Commit [r9950] adds support for class values on the figure caption. Now you can write:
~~~
.. figure:: meow.png
    .. class:: tooltip

   A siamese cat.
~~~
and style the resulting  HTML5 writer output with

     figcaption.tooltip {
       display: none;
       padding: 0.5em;
       width: 20vh;
       background: lightyellow;
       }
     figure:hover figcaption.tooltip { 
       display: block; 
       position: absolute;
       }

To suppress the tooltip in PDF output, convert with 

    rst2latex --strip-elements-with-class=tooltip



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**[feature-requests:#108] "title" option for the "image" directive**

**Status:** open
**Group:** Default
**Created:** Sun Sep 29, 2024 08:41 AM UTC by toastal
**Last Updated:** Mon Oct 14, 2024 06:46 AM UTC
**Owner:** nobody


Like `image`’s `:alt:` directive, allow `:title:` for creating titles on pointer hover. The use case here is different from alt as alt is for assistive technologies & titles are more to give a labels for images for those with pointer cursors.

Expected input

~~~
.. image:: /house.jxl
	:alt: Home
	:title: Navigate home
	:target: /

.. image:: /cat.jxl
	:alt: A Siamese cat on a chair
	:title: Chula says, “meow”
~~~

Expected HTML output

~~~
<a href="/"><img src="/house.jxl" alt="Home" title="Navigate home"></a>
<img src="/cat.jxl" alt="A Siamese cat on a chair" title="Chula says, “meow”">
~~~

~~~






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