Yes! Excellent!
In my first code I have thought the anchor with the button without href, because I was trying to handle click and hover, and I don’t want to load any page. Once you click (or hover) on that button, you can see the list of hrefs and load what you want.
I was thinking also about this:
When I have that button (the first button tagged Sub Menu here) with anchor but without href, once I hover on it, (useful if there is only one child link) the href of the child link appears also on that empty anchor!
Look at this site, scroll down a little bit and look at the right fixed menu. You can see that, (if you use an inspector) only when you hover on the image of the menu, that image become clickable with the same anchor with href of his child link. (It has been used something as, ::before and content, things that I have never used before!)