Does :hover work in 3.1.1?

Does :hover work in 3.1.1?

I am trying to write a JavaScript-less dropdown to switch locale as
e.g. outlined here:
 https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_responsive_navbar_dropdown

Short story: the dropdown is an ul with "display: none" and hovering
over a parent element (that is displayed) is supposed to switch to
"display: block".

But nothing happens when I hover over the parent.

Google found me this, dated August 19 2022, listing pseudo-classes as
Pending, but August 19 2022 is almost two years ago...?
 https://dillo.org/css.html
(looks like that "Pending" may be from January 1 2015...?)

If :hover doesn't work I will have to do it a different way: maybe with
a separate settings page containing a form...?

Here is the HTML of the dropdown:
     <li>
      <div class="locale-dropdown">
       <a href="">Language</a>
       <ul class="locale-dropdown-content">
        <li><a href="">English</a></li>
        <li><a href="">norsk bokmål</a></li>
       </ul>
      </div>
     </li>

(the dropdown is nested in a <li> that is part of the <ul> that forms the <nav>)

The CSS looks like this:

.locale-dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.locale-dropdown:hover .locale-dropdown-content {
  display: block;
}

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