Help Text on mouseover

While using Title Attribute in <apex:selectOption> which is supposed to show the help text is not working,
the below process works have a try!!

Code:

VF page:
                           <apex:selectRadio layout="pagedirection" id="myList">                        
                              <apex:selectOptions value="{!items}"/>
                           </apex:selectRadio>

Controller:
 public List<SelectOption>  items =new List<SelectOption> ();
 public List<SelectOption> getItems() {
        List<SelectOption> options = new List<SelectOption>();
        SelectOption so1 = new SelectOption('Option1','<span title="Hi Option1">Option1</span>');
        so1.setEscapeItem(false);
        options.add(so1);
        SelectOption so2 = new SelectOption('Option2','<span title="Hi Option2">Option2</span>');
        so2.setEscapeItem(false);
        options.add(so2);
        SelectOption so3 = new SelectOption('Option3','<span title="Hi Option3">Option1</span>');
        so3.setEscapeItem(false);
        options.add(so3);
   
    return options;
}

Output: