1 files changed, 16 insertions, 0 deletions
diff --git a/testing/web-platform/tests/shadow-dom/slots-outside-shadow-dom.html b/testing/web-platform/tests/shadow-dom/slots-outside-shadow-dom.html
new file mode 100644
index 0000000000..a6fa2b27f7
--- /dev/null
+++ b/testing/web-platform/tests/shadow-dom/slots-outside-shadow-dom.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<meta charset=utf-8>
+<title></title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id="host1"><slot>foo</slot></div>
+<script>
+
+test(() => {
+  var host1 = document.getElementById("host1");
+  var sr = host1.attachShadow({mode: "open"});
+  sr.innerHTML = "<slot></slot>";
+  assert_array_equals(sr.firstChild.assignedNodes({ flatten: true }), [host1.firstChild]);
+}, "Light DOM slot element should be in flattened assignedNodes");
+
+</script>