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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <h1>CSS Stairway Nav with :has()</h1>

<p>Fork from <a href="https://codepen.io/chriscoyier/pen/AZYeer">Chris Coyier's "Stairway Hover Nav" Pen</a></p>

<p>This Pen is quoted in <a href="https://dskd.jp/archives/117.html">my blog.</a> I also explain a little about: has (), so please take a look.</p>

<div>
  <h2>One Step</h2> 
  <nav class="-step1">
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
  </nav>  
</div>

<div>
   <h2>Two Step</h2>
   <nav class="-step2">
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
  </nav>
</div>

<div>
   <h2>Three Steps</h2>
   <nav class="-step3">
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
  </nav>
</div>

<div>
  <h2>Four Steps</h2>
  <nav class="-step4">
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
    <a href="#">Navigation</a>
  </nav>
</div>
!

CSS 

              
                :root {
  --step1-hs: 26, 95.1%;
  --step1-l: 48.2%;
  --step2-hs: 188, 87.6%;
  --step2-l: 41%;
  --step3-hs: 116, 88.1%;
  --step3-l: 42.7%;
  --step4-hs: 0, 0%;
  --step4-l: 40%;
  --z-index-1st: 3;
  --z-index-2nd: 2;
  --z-index-3rd: 1;
  --z-index-4th: 0;
  --transform-1st: scale(1.1) translateX(24px);
  --transform-2nd: scale(1.07) translateX(12px);
  --transform-3rd: scale(1.04) translateX(4px);
  --transform-4rd: scale(1.01) translateX(2px);
  --box-shadow-1st: 0 0 10px rgba(0, 0, 0, 0.75);
  --box-shadow-2nd: 0 0 10px rgba(0, 0, 0, 0.5);
}

/* color settings */
.-step1, .-step1 a { background-color: hsl(var(--step1-hs), var(--step1-l)) }
.-step2, .-step2 a { background-color: hsl(var(--step2-hs), var(--step2-l)) }
.-step3, .-step3 a { background-color: hsl(var(--step3-hs), var(--step3-l)) }
.-step4, .-step4 a { background-color: hsl(var(--step4-hs), var(--step4-l)) }

/* common a style */
nav a {
  display: block;
  padding: 10px;
  color: white;
  text-decoration: none;
  position: relative;
  transition: all 0.2s ease;
}

.-step1 a:hover {
  --step1-l: 63.2%;
  transform: var(--transform-1st);
  box-shadow: var(--box-shadow-1st);
  z-index: var(--z-index-1st);
}

.-step2 a:hover {
  --step2-l: 60%;
  transform: var(--transform-1st);
  box-shadow: var(--box-shadow-1st);
  z-index: var(--z-index-1st);
}

/* prev & next hover element */
.-step2 a:has(+ a:hover),
.-step2 a:hover + a {
  --step2-l: 49%;
  transform: var(--transform-2nd);
  box-shadow: var(--box-shadow-2nd);
  z-index: var(--z-index-2nd);
}


.-step3 a:hover {
  --step3-l: 57.7%;
  transform: var(--transform-1st);
  box-shadow: var(--box-shadow-1st);
  z-index: var(--z-index-1st);
}

/* prev & next hover element */
.-step3 a:has(+ a:hover),
.-step3 a:hover + a {
  --step3-l: 52.7%;
  transform: var(--transform-2nd);
  box-shadow: var(--box-shadow-2nd);
  z-index: var(--z-index-2nd);
}

/* 2prev & 2next hover element */
.-step3 a:has(+ a + a:hover),
.-step3 a:hover + a + a {
  --step3-l: 47.7%;
  transform: var(--transform-3rd);
  z-index: var(--z-index-3rd);
}


.-step4 a:hover {
  --step4-l: 60%;
  transform: var(--transform-1st);
  box-shadow: var(--box-shadow-1st);
  z-index: var(--z-index-1st);
}

/* prev & next hover element */
.-step4 a:has(+ a:hover),
.-step4 a:hover + a {
  --step4-l: 55%;
  transform: var(--transform-2nd);
  box-shadow: var(--box-shadow-2nd);
  z-index: var(--z-index-2nd);
}

/* 2prev & 2next hover element */
.-step4 a:has(+ a + a:hover),
.-step4 a:hover + a + a {
  --step4-l: 50%;
  transform: var(--transform-3rd);
  z-index: var(--z-index-3rd);
}

/* 3prev & 3next hover element */
.-step4 a:has(+ a + a + a:hover),
.-step4 a:hover + a + a + a {
  --step4-l: 45%;
  transform: var(--transform-4th);
  z-index: var(--z-index-4th);
}


body { 
  background: #222;
  color: white;
  padding: 20px;
}
body > div {
  width: 20%;
  float: left;
  margin-right: 5%;
}
h1 {
  font-size: 36px;
  margin: 0 0 10px 0;
}
h2 {
  margin: 0 0 10px 0; 
}
p a {
  color: hsl(var(--step2-hs), var(--step2-l))
}
!

JS 

              
                // no js
!
999px

Console