Ready to Play with :has CSS4 Selector

index.html

<div class="has">
  <h1 class=".works">:has() CSS4 Selector<br>It's working!</h1>
</div>

<div class="hasnt">
  <h1 class=".not-working">:has() CSS4 Selector<br>It isn't working just yet.</h1>
</div>

Ready to Play with :has CSS4 Selector.markdown

Ready to Play with :has CSS4 Selector

When your browser supports CSS4 selector :has(), the winning statement will be revealed.

A Pen by Liam Conrad on CodePen.

License.

style.css

@import url(http://fonts.googleapis.com/css?family=Raleway:300,400);

body {
  background-color: #556;
}

div {
  width: 70vmin;
  height: 10vmin;
  margin: -5vmin -35vmin;
  position: absolute;
  top: 50%;
  left: 50%;
  
  border-radius: 2vmin;
  overflow: hidden;
  
  &.hasnt {
    background-color: tomato;
  }
  
  &.has {
    background-color: mediumspringgreen;
  }
}

h1 {
  position: absolute;
  top: 50%;
  height: 6vmin;
  width: 100%;
  margin: -3vmin auto 0;
  font-size: 3vmin;
  line-height: 3vmin;
  text-align: center;
  
  font-family: "Raleway";
  font-weight: 400;
  letter-spacing: 0.1rem;
  color: white;
}

.has {
  display: none;
  
  &:has(.works) {
    display: block;
    
    &+.hasnt:has(.not-working) {
      display: none;
    }
  }
}