1 files changed, 43 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-properties-values-api/registered-property-crosstalk.html b/testing/web-platform/tests/css/css-properties-values-api/registered-property-crosstalk.html
new file mode 100644
index 0000000000..8108894369
--- /dev/null
+++ b/testing/web-platform/tests/css/css-properties-values-api/registered-property-crosstalk.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1" />
+<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1238686" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+
+  @property --x {
+    syntax: "<number>";
+    inherits: true;
+    initial-value: 0;
+  }
+
+  #a {
+    --y: 0;
+  }
+
+  #b {
+    --z: 0;
+  }
+
+  #c {
+    --x: 42;
+  }
+
+</style>
+
+<div id=a>
+  <div id=b>
+    <div id=c>
+    </div>
+  </div>
+</div>
+
+<script>
+
+test(function(){
+  assert_equals(getComputedStyle(a).getPropertyValue('--x'), '0');
+  assert_equals(getComputedStyle(b).getPropertyValue('--x'), '0');
+  assert_equals(getComputedStyle(c).getPropertyValue('--x'), '42');
+}, 'Only #c should be affected by --x:42');
+
+</script>