How to exclusively style parent or child when hovering over either of them?

I have some very simple HTML that looks like

<div id="parent">
    <a href='#link' id="child">Child</a>
</div>

I want to style the parent when hovering over the parent and I want to style the child when hovering over the child. I never want both to be styled at the same time.

I tried various combinations of :hover and :not() selectors in SCSS. Googling didn’t bring me far; most solutions I found just tell me how to style the parent when hovering over the child, which is the opposite of what I want.

I found this and this workaround, both from 2013, but I was wondering whether there is a better, more modern way to do this.

>Solution :

If you only intend to support modern, evergreen browsers that support :has, then you can style #parent based on the following conditions:

• is hovered
• does not have a hovered child

That translates to a selector of such: #parent:hover:not(:has(#child:hover)).

In the example below, the #parent is red only when it is hovered and not its child:

#parent:hover:not(:has(#child:hover)) {
  background: red;
}

#child:hover {
  background: green;
} 

<div id="parent">
  <a href='#link' id="child">Child</a>
</div>