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+<!doctype html>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<title>Example of 'column-rule-extent: segment' on a grid container</title>
+<style>
+html,body {
+  color:black; background-color:white; font:20px/1 monospace;
+}
+
+.grid {
+  display: inline-grid;
+  grid: repeat(3, 30px) / auto 20px 40px;
+  gap: 10px 16px;
+
+  column-rule: solid blue;
+  column-rule-extent: segment;
+  row-rule: solid purple;
+  row-rule-extent: segment;
+
+  border: 2px solid;
+  margin-right: 15px;
+  margin-bottom: 30px;
+  background: lightgrey;
+}
+
+x {
+  grid-column: 1;
+  background: grey;
+}
+
+</style>
+
+<div class="grid"><x>row 1</x><x>row 2</x><x>row 3</x></div>