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CSS content property and empty image alt values

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From: steven
Date: Dec 9, 2010 4:12AM

Is anybody familiar with screen reader support (or intentional lack of
support) for the CSS 'content' property?

I ask because I know that images generated by HTML markup are known to be
read by screen readers, but I am thinking if CSS content itself is not read,
then there can often be cases where presentational imagery serves no place
in the HTML DOM and in such cases, would be better than serving images with
empty alt values.

What are peoples thoughts and experience on this.

Regards,

Steven