decimal alignment

according to http://www.w3.org/TR/REC-CSS2/tables.html#column-alignment
I should be able to use the style text-align style to align float data along the decimal point but I have not gotten this to work in either IE or FireFox.
Can some one verify if this does work or not??
I tried with single, double, and no quotes to no avail.

TD
{
text-align: "." ;
}

doesn't work for me maybe it used to work but has since then become deprecated with the newer doctypes and what not

https://bugzilla.mozilla.org/show_bug.cgi?id=2212