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RE: Image replacement techniques fail with IE accessiblity settin gs

From: Scarlett Julian (ED) <Julian.Scarlett@sheffield.gov.uk>
Date: Fri, 5 Dec 2003 10:27:08 -0000
Message-ID: <F9BE3B1AB649D311A573009027852E4D047CB8E7@EDUC_MXS>
To: 'Tom Croucher' <tcroucher@netalleynetworks.com>, Jon Dodd - Bunnyfoot <jon@bunnyfoot.com>
Cc: w3c-wai-ig@w3.org


Tom

brief test only but the positioning differs in IE6 and Moz Firebird. Also the <h1> overflows it's allocated space in IE6 causing scrollbars to appear :-( 
I've no doubt that this is 'just' cross-browser css problems but given that the purpose of image replacement is to candify a page they probably make a lot of difference to some people.

Julian

> -----Original Message-----
> From: Tom Croucher [mailto:tcroucher@netalleynetworks.com]
> Sent: Friday, December 05, 2003 10:17 AM
> To: Jon Dodd - Bunnyfoot
> Cc: w3c-wai-ig@w3.org
> Subject: Re: Image replacement techniques fail with IE accessiblity
> settings
> 
> 
> 
> Yes. I made an accessible Image replacement technique, which  
> unfortunately contains some semantic chaff. However it works 
> and it, or  
> something based on it is the only way to make accessible image  
> replacement with CSS2. This is due to the fact that all image  
> replacement currently uses background: for including the 
> images. I have  
> explored the possibility of removing some of the <span> tags 
> from the  
> markup using before: and after: but concluded that since IE doesn't  
> support and Opera, Mozilla, and Safari badly support them it is not  
> workable at the moment. However I would love someone to use them to  
> find something which would work in the future.
> 
> This works on the idea of having a container element which has two  
> spans in it, one for the text and an empty one for the image. Within  
> the container these are then overlayed the image over the text. The  
> container can be put anywhere happily with the image 
> replacement still  
> working. In this example a <h1> is used but a <span> could be used  
> equally well.
> 
> <html>
> <head>
> 
> <style>
> #logoimage {
>   	/* Must use position to cause the overlap */
>           position: absolute;
> 	background: url('helloworld.gif') top left no-repeat;
> 	height: 31px;
> 	width: 214px;
> 	padding: 0;
> 	margin: 0;
> 	z-index: 1;
> }
> 
> #logo {
> 	/* Must use position to cause the overlap */
>           position: absolute;
> 	overflow: auto;
> 	height: 31px;
> 	width: 214px;
> 	padding: 0;
> 	margin: 0;
> 	z-index: -1;
> }
> 
> #logocontainer {
>          /* Must have same height and width as the 
> replacement image */
>          height: 31px;
>          width: 214px;
> }
> 
> </style>
> 
> </head>
> 
> <body>
> <br />
> <br />
> <h1 id="logocontainer"><a href="#" id="logo">Hello World!</a><span  
> id="logoimage"></span></h1>
> 
> </body>
> 
> </html>
> 
> The image used in this code example is available at  
> <http://www.netalleynetworks.com/Members/tcroucher/accessibility/ 
> helloworld.gif>
> 
> There is a "test" page for this at  
> <http://www.netalleynetworks.com/Members/tcroucher/accessibili
ty/nnir>  
mostly because I haven't had the time to write it up properly.


I hope this is a decent solution that people are happy with.


Tom

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Received on Friday, 5 December 2003 05:27:43 GMT

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