I have been reading recently that people are having problems with IE10 touch screen devices when trying to use multi level menus that work using :hover to open the sub menus.
Because IE10 touch screen devices treat 'hover' in the same way as 'click' these menus do not open the sub menus but instead go to the linked page. Even when the top level element is not a link then the sub menu only opens whilst you keep your finger on the top level element. Trying to move onto the sub menu will cause it to collapse.
To solve this problem I have found that Microsoft have the 'aria-haspopup' attribute that can be applied to any element which may display a popup window. So we can apply this to the list items which contain sub menus.
This only needs to be applied to the top level list items as it cascades down through the many levels of sub menus.
So on any top level list item that contains sub menus just add the attribute aria-haspopup="true" and to stop all links in the sub menus from having to be tapped twice you will need to add the attribute aria-haspopup="false" to the list items that contain links but do not have sub menus.
So if you have a touch screen PC or tablet running IE10 then you will see that this menu works perfectly.
I believe that this is the first dropdown/flyout menu on the web to work on a touch screen device using IE10
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