I've tried implementing 'honest' tricks of obscured and
shrinked-to-invisibility text (like yours) for such things, and as far
as I've found they're completely unreliable. Most devices have a minimum
text size option, and on many this is turned on by default - for
example, Opera and Safari will keep the text visible and legible, and IE
doesn't understand 0 for this property, and will ignore it (the smallest
you can get text in IE is 1px, which looks absolutely bizarre).
For all such instances I would now recommend the generic screen
reader-friendly option of wrapping the text in question in a span, and
making that span {position:absolute;left:-90000px;}.
By separating the text into the span, you no longer need to apply
anything to the images.
Regards,
Barney
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