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HTML

              
                <div class="wrapper">
 <h1>Fragmentation In Multicol: box-decoration-break</h1>
  <p>Investigating which properties are supported for multicol, and also whether feature queries correctly indicate support.</p>
<section class="slice">
    <h2>box-decoration-break: slice</h2>
    <p class="note">The bottom of the border in column 1 and top of the border in column 2 should be missing.</p>

    <div class="supports"></div>

    <div class="container">
      <p>But almost before the invention of the hot-air balloon had been completed, and before Pilâtre de Rozier had made his ascent, a rival craft had appeared upon the scene, to which we must more specially refer in the next chapter.</p>

      <p class="target">This box should be broken across two columns. It has a border which is what we are interested in here.</p>

      <p>During the time of which we are speaking there was living in London a famous chemist named Henry Cavendish. He was the son of a nobleman, and a very rich man; but he shut himself up entirely from the world, and devoted his whole time and energies
        to the study of science. So afraid was he of being interrupted in his work that he lived the life of a hermit, commanding his servants to keep out of his sight on pain of dismissal, and ordering his dinner daily by means of a note placed on the
        hall table. In the year 1760—twenty-two years before the Montgolfier brothers began their experiments—this eccentric man had discovered what was then known as “inflammable air,” but what we now call hydrogen gas.</p>

    </div>
  </section>

<section class="clone">
    <h2>box-decoration-break: clone</h2>
    <p class="note">The two parts of the box should each have a complete border.</p>

    <div class="supports"></div>

    <div class="container">
      <p>But almost before the invention of the hot-air balloon had been completed, and before Pilâtre de Rozier had made his ascent, a rival craft had appeared upon the scene, to which we must more specially refer in the next chapter.</p>

      <p class="target">This box should be broken across two columns. It has a border which is what we are interested in here.</p>

      <p>During the time of which we are speaking there was living in London a famous chemist named Henry Cavendish. He was the son of a nobleman, and a very rich man; but he shut himself up entirely from the world, and devoted his whole time and energies
        to the study of science. So afraid was he of being interrupted in his work that he lived the life of a hermit, commanding his servants to keep out of his sight on pain of dismissal, and ordering his dinner daily by means of a note placed on the
        hall table. In the year 1760—twenty-two years before the Montgolfier brothers began their experiments—this eccentric man had discovered what was then known as “inflammable air,” but what we now call hydrogen gas.</p>

    </div>
  </section>
  
  <section class="webkit-clone">
    <h2>-webkit-box-decoration-break: clone</h2>
    <p class="note">The two parts of the box should each have a complete border.</p>

    <div class="supports"></div>

    <div class="container">
      <p>But almost before the invention of the hot-air balloon had been completed, and before Pilâtre de Rozier had made his ascent, a rival craft had appeared upon the scene, to which we must more specially refer in the next chapter.</p>

      <p class="target">This box should be broken across two columns. It has a border which is what we are interested in here.</p>

      <p>During the time of which we are speaking there was living in London a famous chemist named Henry Cavendish. He was the son of a nobleman, and a very rich man; but he shut himself up entirely from the world, and devoted his whole time and energies
        to the study of science. So afraid was he of being interrupted in his work that he lived the life of a hermit, commanding his servants to keep out of his sight on pain of dismissal, and ordering his dinner daily by means of a note placed on the
        hall table. In the year 1760—twenty-two years before the Montgolfier brothers began their experiments—this eccentric man had discovered what was then known as “inflammable air,” but what we now call hydrogen gas.</p>

    </div>
  </section>
</div>
              
            
!

CSS

              
                body {
  padding: 2em;
  font: 16px/1.5 'Open Sans', sans-serif;
  color: #333;
}

.note {
  font-size: 85%;
}

section {
  border-top: 1px solid #ccc;
  margin-bottom: 2em;
  padding-bottom: 2em;
}

.wrapper {
  width: 800px;
  margin: 0 auto;
}

.container {
  column-width: 250px;
  column-gap: 25px;
}

.target, .fancy {
  font: 26px 'Berkshire Swash', cursive;
}

.target {
  border: 5px solid #ccc;
  padding: 5px;
}

.slice .target {
  box-decoration-break: slice;
}

.clone .target {
  box-decoration-break: clone;
}

.webkit-clone .target {
  -webkit-box-decoration-break: clone;
}


.supports {
  padding: .5em;
  width: 800px;
  margin: 2em auto;
  border: 1px solid red;
}

.supports::after{
  content: "Feature Queries says NO"
}

@supports (box-decoration-break: slice) {
  .slice .supports {
    border: 1px solid green;
  }
  
  .slice .supports::after {
    content: "Feature Queries says YES"
  }
}

@supports (box-decoration-break: clone) {
  .clone .supports {
    border: 1px solid green;
  }
  
  .clone .supports::after {
    content: "Feature Queries says YES"
  }
}

@supports (-webkit-box-decoration-break: clone) {
  .webkit-clone .supports {
    border: 1px solid green;
  }
  
  .webkit-clone .supports::after {
    content: "Feature Queries says YES"
  }
}
              
            
!

JS

              
                
              
            
!
999px

Console