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RE: Validation errors in "Techniques for providing useful text alternatives" page

From: Rabab Gomaa <Rabab.Gomaa@inspection.gc.ca>
Date: Thu, 11 Apr 2013 18:24:11 -0400
Message-Id: <5166FFCA.1E64.00E0.0@inspection.gc.ca>
To: "'Jonathan Avila'" <jon.avila@ssbbartgroup.com>, "Andy Keyworth" <akeyworth@tbase.com>, "'WAI Interest Group list'" <w3c-wai-ig@w3.org>
I don't think the validator has a bug. The validator is correct showing
an error when a figcaption is preceded and followed by a flow content.
(Ref. content model
http://www.w3.org/TR/html5/grouping-content.html#the-figure-element)

 
I would argue the W3C rule for not allowing figcaption to be preceded
and followed by flow content. 
 
Rabab Gomaa
>>> "Andy Keyworth" <akeyworth@tbase.com> 4/11/2013 10:12 am >>>

My best guess is it’s a Validator bug; the sample code from
“http://www.w3.org/TR/html-alt-techniques/#hbh” doesn’t pass the
Validator either. 
Going to a simplified code sample:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>test</title>
</head>
<body>
<figure role="group">   
<img src="webcam1.jpg" alt="Sopwith house weather cam. Taken on the
21/04/10 at 11:51 and 34 seconds." />  
<figcaption>View from the top of Sopwith house, looking towards north
Kingston. In the foreground of the image are the safety rails on the
flat part of the roof. Nearby there are low rise industrial buildings,
beyond are blocks of flats. In the distance there's a church
steeple.</figcaption>
<p>This image is updated every hour.</p>
</figure>
</body>
</html>
causes the Validator to declare the same error about “element p not
allowed as a child of element figure in this context”; while 
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>test</title>
</head>
<body>
<figure role="group">   
<img src="webcam1.jpg" alt="Sopwith house weather cam. Taken on the
21/04/10 at 11:51 and 34 seconds." />  
<p>This image is updated every hour.</p>
<figcaption>View from the top of Sopwith house, looking towards north
Kingston. In the foreground of the image are the safety rails on the
flat part of the roof. Nearby there are low rise industrial buildings,
beyond are blocks of flats. In the distance there's a church
steeple.</figcaption>
</figure>
</body>
</html>
does not, even though according to the description on the page above,
both element orderings are valid. 

Andy Keyworth
Senior Web Accessibility Specialist |T-Base Communications Inc. (
http://www.tbase.com/ )
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From:Rabab Gomaa [mailto:Rabab.Gomaa@inspection.gc.ca] 
Sent: April-11-13 7:52 AM
To: Jonathan Avila; 'WAI Interest Group list'
Subject: Re: Validation errors in "Techniques for providing useful text
alternatives" page

 

My doctype is well defined. The code below can be used to see the role
and figcaption errors on W3C validation service http://validator.w3.org
.

 

Notice the <p> before the figcaption is causing the second error; the
figure element does not allow "flow content" followed by "one
figcaption" then "flow content". 

However, sometimes there is information like this <p> in the code below
related to the figure. Other example can be <p> about the source of the
figure data OR hint to click on image to enlarge.  Do you think it ok to
add such information in the figcaption? 


It doesn't seem to me a figcaption (by definition in HTML 5 - caption
or legend for the rest of the contents...) for the figure.

 



<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>test</title>
</head>
<body>
<figure role="group">
<p>Note: The data presented is based relative to the size.</p>
<figcaption>The Regulation of Plants</figcaption>
<img src="images/pntchae.gif" alt="Flowchart - The Regulation of
Plants. Details in text following the image"
width="450" height="358">
<details>
<summary>Description for image</summary>
<p>Here you put the long description content</p>
</details>
</figure>
</body>
</html>




>>> Jonathan Avila <jon.avila@ssbbartgroup.com> 4/10/2013 8:43 pm >>>

Did you define the doctyoe as HTML indicating HTML5?  Those sound like
a doctyoe declaration issue. 

 

Jon


On Apr 10, 2013, at 7:58 PM, "Rabab Gomaa"
<Rabab.Gomaa@inspection.gc.ca> wrote:



Hello, 

 

I used some techniques from "Techniques for providing useful text
alternatives" page however the W3C validation service shows the
following errors: 

 

- Error 1: Attribute role not allowed on element figure at this point.

<figure role="group">

-- Role is a solution to provide a programmatically determinable
relationship between the image and its description until:
http://www.w3.org/TR/html-alt-techniques/#haee 

Also upon the page http://www.w3.org/TR/wai-aria/roles#group Authors
SHOULD use a groupto form logical collection of items in a widget (
http://www.w3.org/TR/wai-aria/terms#def_widget ) such as children in
a tree widget forming a collection of siblings in a hierarchy, or a
collection of items having the same container in a directory. 

Is role supported or not for the figure element?

 

- Error 2: Element p not allowed as child of element figure in this
context. (Suppressing further errors from this subtree.)

<figure role="group">

<img src="webcam1.jpg" alt="Sopwith house weather cam.">
<figcaption>View from the top of Sopwith house </figcaption>
<p>This image is updated every hour.</p>
</figure>

-- Sometimes there is a note <p> or table and it is not always usable
to have them all with the image before or after the <figcaption> 

so what to do? A similar example exists on
http://www.w3.org/TR/html-alt-techniques/#hbh 

 

Thank you,

Rabab
Received on Thursday, 11 April 2013 22:24:44 UTC

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