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CSS

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JavaScript

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HTML

              
                <details>
  <summary>
    What can I put in here?
  </summary>

  <p>
    You can put whatever you want! Here's an example of a list:
  </p>
  
  <ul>
    <li>This is a great feature</li>
    <li>It is accessible out-of-the-box</li>
    <li>No need for a JavaScript library</li>
    <li>Plus you can style it with CSS</li>
  </ul>
</details>

<!-- Shameless plug 😉 -->
<a class="twitter" href="https://twitter.com/KeenanPayne_" title="Follow me on Twitter" target="_blank">
    <img src="https://assets.codepen.io/174608/twitter.svg" />
</a>
              
            
!

CSS

              
                body {
  padding-left: 3rem;
  padding-right: 3rem;
  width: 100%;
}

details {
  --shadow: hsla(0, 0%, 0%, 0.05);
  --shadow-light: hsla(0, 0%, 95%, 0.1);
  --shadow-dark: hsla(0, 0%, 0%, 0.075);
  
  background-color: white;
  border-radius: 10px;
  box-sizing: border-box;
  transition: box-shadow 500ms cubic-bezier(0.22, 1, 0.36, 1),
              transform 225ms cubic-bezier(0.45, 0, 0.55, 1);
  width: 100%;
  
  @media (min-width: 560px) {
    margin-left: auto;
    margin-right: auto;
    max-width: 600px;
  }
  
  &:hover {
    box-shadow: -6px -6px 12px var(--shadow-light, transparent), 
                6px 6px 12px var(--shadow, transparent);
  }
  
  &:active {
    box-shadow: -4px -4px 8px var(--shadow-light, transparent), 
                4px 4px 8px var(--shadow, transparent);
  }
  
  &:active {
    transform: scale(.995);
  }
  
  // Open state
  &[open] {
    box-shadow: -12px -12px 24px var(--shadow-light, transparent), 
                12px 12px 24px var(--shadow, transparent);
    border: 2px solid var(--shadow-dark);
  }
  
  // Subsequent details
  + details {
    margin-top: 24px;
  }
  
  // Descendants
  > summary {
    cursor: pointer;
    font-weight: 400;
    // Hiding outline for aesthetics, shifting the focus state
    // to the <details>, but reconsider depending on your 
    // approach to accessibility
    outline: none;
    padding: 1.25rem 1.5rem;
  }
  
  > p,
  > ul {
    color: #666;
    font-size: .875rem;
    line-height: 1.6;
    margin-top: 0;
  }
  
  > p { 
    margin-bottom: 0;
    padding: 0 1.5rem .5rem;
  }
  
  > ul {
    padding-bottom: 1rem;
    padding-left: 3rem;
  }
}

// You can update the triangle to be whatever you would
// like by using the following code:
details > summary {
  // list-style: none;
  
  &::-webkit-details-marker {
    // display: none; 
  }
}


//
// Demo Styles
// -----------

:root {
  align-items: center;
  background-color: #f7f8fc;
  display: flex;
  font-family: 'Inter', sans-serif;
  justify-content: center;
  min-height: 100vh;
  
  @supports (font-variation-settings: normal) {
    font-family: 'Inter var', sans-serif;
  }
}

.twitter { 
  bottom: 0;
  position: fixed;
  right: 0;
  width: 50px;
}
              
            
!

JS

              
                /**
 * Goodbye JavaScript
 * You are no longer needed
 * At least for today
 * 😉
 */
              
            
!
999px

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