There are probably so many answers and contradictory answers to this question. I have one for you to ponder. Does the Google bot, or maybe others too, read and `screen tips`. I am hoping to use many screen tips and wondered if they could be read. Have a think folks Salamander
if they are in the source code, and written in plain HTML, CSS (Sometime javascript) then yes they can be read, i know google is more advanced then others so google most probally can but the others might not.
What about text within <span style="display:none"> </span> blocks? Sometimes this is how people do tooltips/hovers, etc.