javascript - confirm() not working in IE9 but working in IE8

Question

I have below code in my aspx page, which is working fine in IE8. but not working in IE9.

function ProjetFocus() {
        var s = confirm("Do you want to create a new project?");
        if (s == false) {
            document.getElementById('<%=txtProject.ClientID %>').value = "";
        }           
    }

Answer 1

is it in compatipility mode or has javascript disabled for ie9? Check this out.