I ran a validation on my website and AFAICT the CSS value for speak should be valid CSS3.

Described here: http://www.w3schools.com/xslfo/prop_speak.asp

.stylename
{
    speak: spell-out;
}

generates this error:

Value Error : speak spell-out is not a speak value : spell-out 

(also the link on speak leads to a 404: http://jigsaw.w3.org/css-validator/nullaural.html#propdef-speak)

I hope this is a valid bug and I'm not wasting peoples time :)

Thanks,

Phill