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HTML 

              
                  <ul class="tabs">
  <li class="active">
    <h3><a id="responsive" href="javascript: document.querySelector('.tabs .active').classList.remove('active'); document.querySelector('#responsive').parentElement.parentElement.classList.add('active');">Responsive</a></h3>
    <div>
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque iaculis metus est, at maximus metus pulvinar a. Proin scelerisque placerat orci, quis porta sapien aliquam id.</p>
    </div>
  </li>
  <li>
    <h3><a id="accessible" href="javascript: document.querySelector('.tabs .active').classList.remove('active'); document.querySelector('#accessible').parentElement.parentElement.classList.add('active');">Accessible</a></h3>
    <div>
      <p>Mauris tincidunt, velit nec iaculis rhoncus, lorem sapien feugiat lacus, sit amet pretium nisi augue ac nisi. Donec at rhoncus tellus, nec feugiat purus. Vestibulum elit odio, tincidunt ac ligula ut, commodo lacinia velit. Morbi cursus lorem eget vulputate facilisis. Praesent elementum lacus nec eros cursus finibus.</p>
    </div>
  </li>
  <li>
    <h3><a id="overscroll-ready" href="javascript: document.querySelector('.tabs .active').classList.remove('active'); document.querySelector('#overscroll-ready').parentElement.parentElement.classList.add('active');">Overscroll</a></h3>
    <div>
      <p>Phasellus ligula tortor, mollis non facilisis ac, pretium id quam. Vestibulum tristique lacus ac libero suscipit, quis cursus quam condimentum. Ut bibendum justo aliquet, mattis eros id, venenatis turpis. Aenean at tortor ac sem hendrerit fringilla in vel magna. Mauris a tellus ullamcorper, lobortis ligula et, blandit augue.</p>
    </div>
  </li>
</ul>
!

CSS 

              
                body, html {height: 100%; margin: 0; padding: 0;}
body {display: flex; font-family: sans-serif; line-height: 1.4;}

.tabs {margin: auto; padding: 0; max-width: 50rem; position: relative; border-radius: 1rem;}
.tabs li {list-style: none;}
.tabs li > div {padding: 0 1.5rem 0 2.35rem; color: rgb(31, 20, 26); display: none;}
.tabs li.active > div {display: block;}
.tabs li > h3 {font-size: 1rem; margin: 0; padding: 0 1.5rem; position: relative;} 
.tabs li > h3 a {color: inherit; text-decoration: none; display: block; width: 100%; cursor: text; outline-color: rgb(255, 20, 146); cursor: pointer; color: rgb(107, 97, 102); padding: 0.5rem 0; border: 1px dotted transparent;}
.tabs li p {margin: 0 0 2rem;}
.tabs li.active > h3 {color: rgb(31, 20, 26);}
.tabs li.active > h3 a {margin-bottom: 0.5rem; color: black;}
.tabs li > h3 a::before {content: "›"; margin-right: 0.5rem; color: #ff1492;}
.tabs li > h3 a:hover {background: rgba(255, 20, 146, 0.05);}
.tabs li > h3 a:focus {outline: none; border: 1px dotted black;}

@media (min-width: 576px) {
  .tabs {padding-top: 4rem; box-shadow: 0px 0px 1rem rgba(0,0,0,0.15); }
  .tabs li {margin: 0;}
  .tabs li > div {padding: 0.75rem 1.5rem 0.5rem 1.5rem; min-height: 8rem}
  .tabs li > h3 {position: absolute; top: 0rem; text-align: center; margin: 0; padding: 0; border: 0;}
  .tabs li:first-child h3 a {border-top-left-radius: 1rem;}
  .tabs li:nth-child(2) > h3 {margin-left: 9.3rem;}
  .tabs li:nth-child(3) > h3 {margin-left: 18.6rem;}
  .tabs li.active > h3 {border-bottom: 2px solid #ff1492;}
  .tabs li > h3 a {padding: 1rem 0 1rem!important; margin-bottom: 0!important; width: 9.3rem;}
  .tabs li > h3 a::before {content: none;}
}
!

JS 

              
                /*

Hi Adam, 

Your CSS and JS wizardry is amazing! Thank you for that. I immediately got a lot of different questions though:

- Do you really need all that fancyness? 
- What does the kebab do? 
- Aren't these tabs just the headers? 
- Is this still readable without CSS? 
- Do you actually need javascript for tabs?

I illustrated how I would build a tabs component and how I would simplify its view on mobile. My tabs have very little javascript, they are fully responsive and are fully accessible (try tabbing). The only downside could be that the links are mistaken by (users of) screen readers for actual useful/interesting links. I do not (yet) know how to solve that. Do you?

I am looking forward to your next GUI challenge. Have a great day!

https://web.dev/shows/gui-challenges/mMBcHcvxuuA/

*/
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999px

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