I am applying truncation using CSS styles:

.yui-skin-sam td:not(.yui-dt-editable) .yui-dt-liner{
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    -ms-text-overflow: ellipsis;        
    -o-text-overflow: ellipsis;
    -moz-binding: url('ellipsis.xml#ellipsis');     
}

.yui-skin-sam td[class~=yui-dt-editable] .yui-dt-liner{
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    -ms-text-overflow: ellipsis;        
    -o-text-overflow: ellipsis;
}

(Sidenote: I'm not sure if this is the best way to write my CSS. This is a Firefox specific workaround since truncation on Firefox only sort-of works).

I want a tool-tip to appear over text that is truncated. How do I detect if text is truncated so that I can display a tool-tip?