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<!doctype html>
<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<title>Examples of subgrid rules.</title>
<style>
.grid {
  position: relative;
  display: inline-grid;
  grid-template-columns: 30px 50px 70px;
  inline-size: 200px;
  gap: 8px;
  place-content: center;
  border: 2px solid;

  column-rule: auto solid;
  column-rule-image: linear-gradient(#f008,#fc08);
  column-rule-extent: all-long allow-overlap;
  row-rule: 6px solid purple;
  row-rule-extent: all-long;
}

.subgrid {
  display: grid;
  grid: subgrid / subgrid;
  grid-column: 1 / span 2;
  grid-row: 2 / span 2;
  border: 1px dashed;
  margin: 6px;

  column-rule: 2px solid red;
  row-rule: solid blue;
  row-rule-align: rule;
  row-rule-edge-align: gap-over;
}

.subgrid.larger {
  gap: 16px;
  row-rule-lateral-inset-start: 1px;
}

.subgrid.smaller {
  gap: 4px;
  row-rule-width: 100%;
}

x {
  background: grey;
  opacity: 0.5;
}

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

<div class="grid" test="A subgrid with a larger gap than the parent.">
  <x>1</x><x>2</x><x>3</x>
  <div class="subgrid larger"><x>4</x><x>5</x><x>6</x></div>
  <x>7</x><x>8</x>
</div>

<div class="grid" test="A subgrid with a smaller gap than the parent.">
  <x>1</x><x>2</x><x>3</x>
  <div class="subgrid smaller"><x>4</x><x>5</x><x>6</x></div>
  <x>7</x><x>8</x>
</div>