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diff --git a/testing/web-platform/tests/html/editing/editing-0/contenteditable/contentEditable-slotted-inherit.html b/testing/web-platform/tests/html/editing/editing-0/contenteditable/contentEditable-slotted-inherit.html
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+++ b/testing/web-platform/tests/html/editing/editing-0/contenteditable/contentEditable-slotted-inherit.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>contentEditable inherit from light tree parent</title>
+<link rel="author" title="Rune Lillesveen" href="mailto:futhark@chromium.org">
+<link rel=help href="https://html.spec.whatwg.org/multipage/#contenteditable">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<p>You should see the word PASS two times below and no FAIL.</p>
+<div id="host1" contenteditable><div>FAILPASS</div></div>
+<div id="host2" contenteditable><div>FAILPASS</div></div>
+<script>
+  test(() => {
+    const root = host1.attachShadow({mode:"open"});
+    root.innerHTML = "<slot></slot>";
+    const text = host1.firstChild.firstChild;
+    const selection = window.getSelection();
+    selection.collapse(text, 0);
+    selection.extend(text, 4);
+    host1.focus();
+    document.execCommand("delete");
+    host1.blur();
+    assert_equals(text.data, "PASS", "Text should be PASS after FAIL is deleted");
+  }, "Slotted child of contenteditable host should be editable - slot direct child of shadow root");
+
+  test(() => {
+    const root = host2.attachShadow({mode:"open"});
+    root.innerHTML = "<div><slot></slot></div>";
+    const text = host2.firstChild.firstChild;
+    const selection = window.getSelection();
+    selection.collapse(text, 0);
+    selection.extend(text, 4);
+    host2.focus();
+    document.execCommand("delete");
+    host2.blur();
+    assert_equals(text.data, "PASS", "Text should be PASS after FAIL is deleted");
+  }, "Slotted child of contenteditable host should be editable - slot wrapped in shadow tree ancestor");
+</script>