Using the tab to open child menus

Hello,
For accessibility reasons, clicking on the Tab key should open the child menus. Right now the tab key focuses only on the main menu, and not on the child menus. What code do I have add for it?

Hi Nirit,

Thanks for using our product,
I'm sorry, I don't understand your question. Please clarify your issue again and what is name product that you are using on your site?
Thank you so much for empathy,

Hi,
I have Mega Menu in the website magid.huji.ac.il , and when I use the tab in the keyboard to move from one link to the other, the sub menus do not open. Usually I add to the links tabindex="0" in such cases, but I tried to add it here and it does not work.

Hi Nirit,

I'm sorry, Currently, our module doesn't support "tab" in the keyboard that can open sub-menus
Thank you so much for empathy