Dojo.query remove class

Dojo.query remove class

I want to remove a class so I use this following code :
var StyleToRemove = query(".someclass").parent().parent().parent().parent();
StyleToRemove.forEach(function(node) {
domClass.remove(node, "ui-state-default");
});
The code works on Firefox(StyleToRemove returns object HTMLdivElement) but
not on ie8(StyleToRemove returns object).
Why ?