1 files changed, 36 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-tables/collapsed-border-partial-invalidation-001.html b/testing/web-platform/tests/css/css-tables/collapsed-border-partial-invalidation-001.html
new file mode 100644
index 0000000000..67330e4d2c
--- /dev/null
+++ b/testing/web-platform/tests/css/css-tables/collapsed-border-partial-invalidation-001.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="author" title="David Shin" href="dshin@mozilla.com">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1879731">
+<link rel="match" href="collapsed-border-partial-invalidation-001-ref.html">
+<meta name="assert" content="Invalidating part of a border-collapsed table keeps border styling correctly.">
+<style>
+table {
+  border-collapse: collapse;
+}
+
+.group {
+  border-left: 1px solid black;
+  border-right: 3px solid black;
+}
+</style>
+<table>
+  <tbody id="table">
+    <tr><td class="group">X</td></tr>
+    <tr><td>X</td></tr>
+  </tbody>
+</table>
+
+<script>
+onload = function () {
+  // Make sure the table layout is flushed
+  table.getBoundingClientRect();
+  const tr = document.createElement('tr');
+  const td = document.createElement('td');
+  td.innerText = "X";
+  tr.appendChild(td);
+  table.appendChild(tr);
+  document.documentElement.className = "";
+}
+</script>
+</html>