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<!doctype html>
<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<title>Examples of 'column-rule-extent' values in a Masonry grid layout.</title>
<style>
.grid {
  position: relative;
  display: inline-grid;
  grid: masonry / 3ch 4ch 5ch;
  gap: 20px;
  margin-right: 20px;
  margin-bottom: 40px;
  background: lightgrey;

  block-size: 160px;
  align-content: center;

  column-rule: solid blue;
  column-rule-align: rule;
  column-rule-edge-align: gap-over;
  row-rule: 6px solid purple;
  row-rule-extent: all-long;
}
.segment { column-rule-extent: segment; }
.segment-allow-overlap { column-rule-extent: segment allow-overlap; }
.short-allow-overlap { column-rule-extent: short allow-overlap; }
.short { column-rule-extent: short; }
.long-allow-overlap { column-rule-extent: long allow-overlap; }
.long { column-rule-extent: long; }
.start { column-rule-extent: start; }
.end { column-rule-extent: end; }
.all-long-allow-overlap { column-rule-extent: all-long allow-overlap; }
.all-long { column-rule-extent: all-long; }

x {
  background: grey;
  opacity: 0.5;
}
x:nth-child(1) { padding-block-start: 30px; }
x:nth-child(2) { grid-column:span 2 }
x:nth-child(3) { padding-block-end: 20px;  }
x:nth-child(7) { grid-column: span 2;  }
x:nth-child(8) { padding-block-end: 10px;  }

.grid::after {
  position: absolute;
  bottom: -3em;
  font-size: 10px;
  font-style: italic;
  vertical-align: top;
  content: attr(test);
  white-space: pre;
}
pre { font-size: 10px; }
</style>

<pre>All have <i>'column-rule-edge-align: gap-over'</i> to extend
the edge rules out to the content-box edge.</pre>

<div class="grid short"><x>1</x><x>2</x><x>3</x><x>4</x><x>5</x><x>6</x><x>7</x><x>8</x></div>
<div class="grid long"><x>1</x><x>2</x><x>3</x><x>4</x><x>5</x><x>6</x><x>7</x><x>8</x></div><br>
<div class="grid start"><x>1</x><x>2</x><x>3</x><x>4</x><x>5</x><x>6</x><x>7</x><x>8</x></div>
<div class="grid end"><x>1</x><x>2</x><x>3</x><x>4</x><x>5</x><x>6</x><x>7</x><x>8</x></div><br>

<script>
window.onload = function() {
  [...document.querySelectorAll('.grid')].forEach(function(elm) {
    const cs = window.getComputedStyle(elm);
    elm.setAttribute("test", 
      "'column-rule-extent: " + cs.columnRuleExtent + "' \n" +
      "'column-rule-align: " + cs.columnRuleAlign + "'"
    );
  });
}
</script>