1 files changed, 33 insertions, 1 deletions
diff --git a/testing/web-platform/tests/css/css-cascade/scope-implicit.html b/testing/web-platform/tests/css/css-cascade/scope-implicit.html
index 9add25fc9a..a1c6d1c626 100644
--- a/testing/web-platform/tests/css/css-cascade/scope-implicit.html
+++ b/testing/web-platform/tests/css/css-cascade/scope-implicit.html
@@ -196,4 +196,36 @@ test((t) => {
   assert_equals(getComputedStyle(outer).zIndex, 'auto');
   assert_equals(getComputedStyle(outside_limit).zIndex, 'auto');
 }, 'Implicit @scope with limit');
-</script>
-\ No newline at end of file
+</script>
+
+<template id=test_concurrent_scope_proximity>
+<style>
+@scope {
+  * { z-index: 1;}
+}
+</style>
+  <div>
+    <style>
+      @scope {
+        * { z-index:2; }
+      }
+    </style>
+    <div id=inner>
+    </div>
+  </div>
+  <div id=outer></div>
+<style>
+@scope {
+  * { z-index: 3;}
+}
+</style>
+</template>
+<script>
+test((t) => {
+  t.add_cleanup(() => main.replaceChildren());
+  main.append(test_concurrent_scope_proximity.content.cloneNode(true));
+
+  assert_equals(getComputedStyle(inner).zIndex, '2');
+  assert_equals(getComputedStyle(outer).zIndex, '3');
+}, 'Proximity calculation of multiple implicit @scope');
+</script>