This idea's based on the following (x)html:
<form><fieldset><buttondisabledtitle="this is disabled">disabled button</button></fieldset></form>
And uses the following CSS to achieve something close to your aim:
button {position: relative;}
button:hover:after
{position: absolute;
top:0;
left:0;
content: attr(title);
background-color:#ffa;
color:#000;
line-height:1.4em;
border:1px solid #000;}
It's not ideal, but it was the best non-JavaScript idea I could come up with.
from:http://stackoverflow.com/questions/2151575/how-do-you-render-tooltip-on-disabled-html-button