Thank you for the update and link Patrick, that's good to know.

> It's an outdated piece of advice. Old screen readers did not cope with 
> empty alts, so alt="*" was suggested as a viable default: screen
> readers apparently didn't read that out on normal settings.
> 
> However, nowadays the suggested practice is the null alt, alt=""
> 
> This issue no longer exists, so, as a 
> strong recommendation and not a requirement, we encourage sites to 
> switch to null or empty ALT text."
> 
http://www.rnib.org.uk/xpedio/groups/public/documents/PublicWebsite/
public_alttext.hcsp#P16_1774 
> (halfway down, under "Layout images")
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