What did you do?

golang.org home page, attempt to open responsive menu.
It works fine when I add the is-active class to the header, so I suspect it's the JS code. In the JS code, the click event for the headerMenuButton relies on the path.indexOf("/doc/") to be true, the home page will never satisfy this condition. The click event is never added.

What did you expect to see?

The responsive menu.

What did you see instead?

Nothing.