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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <div class="box">
  <input type="checkbox" id="expanded">
  <p>Hey, don't cut me off like that. I want to speak my mind and don't appreciate being put into a box.</p>
  <!-- Note: I have sadly not found a nice way to put the more button/label inline inside the paragraph, after or before the ellipsis. -->
  <label for="expanded" role="button">read more</label>
</div>

<footer>Inspired by <a href="https://css-tricks.com/almanac/properties/l/line-clamp/">Geoff's demos</a></footer>
            
          
!

CSS

            
              .box {
  
  input {
    opacity: 0;
    position: absolute;
    pointer-events: none;
  }
  
  p {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;  
    overflow: hidden;
  }
  
  input:focus ~ label {
    outline: -webkit-focus-ring-color auto 5px;
  }
  
  input:checked + p {
    -webkit-line-clamp: unset;
  }
  
  input:checked ~ label,
  p:not(.truncated) ~ label{
    display: none;
  }
  
}


/* From here on presentation styles */
body {
  align-items: center;
  background: 
    radial-gradient(
      farthest-side at bottom left,
      rgba(255, 0, 255, 0.5), 
      #246756
    ),
    radial-gradient(
      farthest-corner at bottom right,
      rgba(255, 50, 50, 0.5), 
      #246756 400px
    );
  display: flex;
  flex-direction: column;
  height: 100vh;
  justify-content: center;
  line-height: 1.5;
}

.box {
  background-color: #fff;
  box-shadow: 2px 2px 10px #246756;
  padding: 2em;
  width: 15vw;
  max-width: 250px;
  min-width: 150px;
  
  p {
    margin: 0;
  }
  
  label {
    border-radius: 4px;
    padding: 0.2em 0.6em;
    border: 1px solid #009ce2;
    background-color: #00acff;
    color: #fff;
    font-size: 0.8em;
  }
  
}

footer {
  margin-top: 2em;
  color: #ffffff66;
  a {
    color: #fff;
  }
}
            
          
!

JS

            
              /*
 * Since the pseudo class :truncated is sadly not a thing, if your truncated box is responsive or the text in the box is of arbitrary size, the following code adds or removes a "truncated" class to simulate the feature.
 *
 * Warning: Doesn't work in all browsers due to the use of ResizeObserver, use something like the window's resize event if you need it to be moar cross browser.
 */
const ps = document.querySelectorAll('p');
const observer = new ResizeObserver(entries => {
  for (let entry of entries) {
    entry.target.classList[entry.target.scrollHeight > entry.contentRect.height ? 'add' : 'remove']('truncated');
  }
});

ps.forEach(p => {
  observer.observe(p);
});
            
          
!
999px

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