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Megamenu responsive F6 (drilldown ?)

Hi All,
I try to make a megamenu responsive, with drilldown menu for small screens but the drilldown don't works.
http://codepen.io/ggdav/pen/jWBqaK/
I think something is missing, so i tried to add a "data-submenu" on ul but its the same result. How can I do that?
Thank you

foundation 6megamenuResponsivedrilldown

Hi All,
I try to make a megamenu responsive, with drilldown menu for small screens but the drilldown don't works.
http://codepen.io/ggdav/pen/jWBqaK/
I think something is missing, so i tried to add a "data-submenu" on ul but its the same result. How can I do that?
Thank you