Checkpoint 1.1 Provide text alternatives for ... inserted bullets ...

Checkpoint 1.1 states: Provide text alternatives for ... inserted bullets ...

While it is easy to provide alt-text for an inserted bullet in the old
fashioned way, e.g.

<IMG SRC="blueball.gif" ALT="Item: "> Pencil <BR> 
<IMG SRC="blueball.gif" ALT="* "> Telephone <BR> 
<IMG SRC="blueball.gif" ALT=" "> Calendar <BR> 

how can we add a text alternative for a bullet image inserted via a style
sheet? E.g.

<style>
UL LI { list-style-image: url(blueball.gif) }
</style>

Any thoughts?

Chuck

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