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Re: Adaptive Image Element Proposal

From: Laura Carlson <laura.lee.carlson@gmail.com>
Date: Fri, 7 Sep 2012 17:54:27 -0500
Message-ID: <CAOavpvcjDBZcBPWaS2fx0FR-6sLeM-ydjQwMmNWK7T+tGUi33Q@mail.gmail.com>
To: Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no>
Cc: Adrian Roselli <Roselli@algonquinstudios.com>, Mathew Marquis <mat@matmarquis.com>, Peter Winnberg <peter.winnberg@gmail.com>, Steve Faulkner <faulkner.steve@gmail.com>, HTML WG <public-html@w3.org>, "public-respimg@w3.org" <public-respimg@w3.org>
Hi Leif,

Resending minus the attachments as the mailing list has file size
restrictions. Screenshots are in the Wiki.

You wrote:
> I think: Mat changed his direction not only
> because of temporary "lack of support" complexity *but also* because
> he saw that their model (double @alt) would *end up* complex, once
> <picture> was supported.

Yes, double alt would be complex.

> It is a move towards allowing alternative text via fallback markup
> content (as opposed to just via attributes), and hence a postive step.

An element like <desc> would provide a semantic holder for rich text
on-page long descriptions.

However, it would be hamstrung to on-page descriptions. It would not
be a direct off-page long description that could be applied globally
across multiple sites, or across an entire site, or across a subset of
pages.
http://www.d.umn.edu/~lcarlson/research/constriants/separate-doc.html

> <picture>
>   <img src=file alt=text longdesc=description.url >
> </picture>
>
> QUESTION: How would users of the equipment listed on your
>           research page access that longdesc?
>   ANSWER: It would be broken in some of them...
>
> Browsers: I believe it would not work in a single one of the browsers
>           that you list. E.g. it would not work in iCab. Why not?
>           Because you cannot access the context menu for an image
>           that is hidden behind another element.

This is incorrect Leif. It seems to work in all of them that I tested.

Here is a test page:
http://www.d.umn.edu/~lcarlson/research/constriants/picture-test.html

HTML:
<picture>
 <img src="images/external.png"
 alt="One external file provides and controls the description for multiple docs"
 longdesc="ld/separate-doc.html">
</picture>

I haven't found any instances where the above HTML code differs in
functionality from the what is listed on the research page.

Some results with screen shots:
WORKS in iCab natively
(screenshot: http://www.w3.org/html/wg/wiki/images/4/41/Icab.png )
WORKS in Opera natively
(screenshot: http://www.w3.org/html/wg/wiki/images/f/f2/Opera.png )
WORKS in Opera w/tellmemore
(screenshot: http://www.w3.org/html/wg/wiki/images/2/26/Tellmemore.png )
WORKS in Firefox w/Patrick's longdesc
(screenshot http://www.w3.org/html/wg/wiki/images/b/bf/Firefox.png )
WORKS in Firefox w/Anthony's longdesk
(screenshot: http://www.w3.org/html/wg/wiki/images/c/c1/Longdesk.png )
WORKS in Safari w/longdesc favelet
(screenshot: http://www.w3.org/html/wg/wiki/images/a/af/Safari.png )
WORKS in Chrome w/longdesc favelet
(screenshot: http://www.w3.org/html/wg/wiki/images/8/89/Chrome.png )

Gez Lemon tested the page with JAWS and IE, and the longdesc attribute
is revealed and works correctly with JAWS (opened this page when he
activated it: http://www.d.umn.edu/~lcarlson/research/constriants/ld/separate-doc.html).
He also tested it with Jim Thatcher's longdesc favelet and that found
and revealed it too.

Best Regards,
Laura
--
Laura L. Carlson
Received on Friday, 7 September 2012 22:54:54 GMT

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