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diff --git a/testing/web-platform/tests/IndexedDB/keygenerator-inject.html b/testing/web-platform/tests/IndexedDB/keygenerator-inject.html
new file mode 100644
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+++ b/testing/web-platform/tests/IndexedDB/keygenerator-inject.html
@@ -0,0 +1,119 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Key Generator behavior with explicit keys and value injection</title>
+<link rel=help href="https://w3c.github.io/IndexedDB/#inject-key-into-value">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/support.js"></script>
+<script>
+
+indexeddb_test(
+  (t, db) => {
+    db.createObjectStore('store', {autoIncrement: true, keyPath: 'id'});
+  },
+  (t, db) => {
+    const tx = db.transaction('store', 'readwrite', {durability: 'relaxed'});
+    t.onabort = t.unreached_func('transaction should not abort');
+
+    const store = tx.objectStore('store');
+
+    store.put({name: 'n'}).onsuccess = t.step_func(e => {
+      const key = e.target.result;
+      assert_equals(key, 1, 'Key generator initial value should be 1');
+      store.get(key).onsuccess = t.step_func(e => {
+        const value = e.target.result;
+        assert_equals(typeof value, 'object', 'Result should be object');
+        assert_equals(value.name, 'n', 'Result should have name property');
+        assert_equals(value.id, key, 'Key should be injected');
+        t.done();
+      });
+    });
+  },
+  'Key is injected into value - single segment path');
+
+indexeddb_test(
+  (t, db) => {
+    db.createObjectStore('store', {autoIncrement: true, keyPath: 'a.b.id'});
+  },
+  (t, db) => {
+    const tx = db.transaction('store', 'readwrite', {durability: 'relaxed'});
+    t.onabort = t.unreached_func('transaction should not abort');
+
+    const store = tx.objectStore('store');
+
+    store.put({name: 'n'}).onsuccess = t.step_func(e => {
+      const key = e.target.result;
+      assert_equals(key, 1, 'Key generator initial value should be 1');
+      store.get(key).onsuccess = t.step_func(e => {
+        const value = e.target.result;
+        assert_equals(typeof value, 'object', 'Result should be object');
+        assert_equals(value.name, 'n', 'Result should have name property');
+        assert_equals(value.a.b.id, key, 'Key should be injected');
+        t.done();
+      });
+    });
+  },
+  'Key is injected into value - multi-segment path');
+
+indexeddb_test(
+  (t, db) => {
+    db.createObjectStore('store', {autoIncrement: true, keyPath: 'a.b.id'});
+  },
+  (t, db) => {
+    const tx = db.transaction('store', 'readwrite', {durability: 'relaxed'});
+    t.onabort = t.unreached_func('transaction should not abort');
+
+    const store = tx.objectStore('store');
+
+    store.put({name: 'n1', b: {name: 'n2'}}).onsuccess = t.step_func(e => {
+      const key = e.target.result;
+      assert_equals(key, 1, 'Key generator initial value should be 1');
+      store.get(key).onsuccess = t.step_func(e => {
+        const value = e.target.result;
+        assert_equals(typeof value, 'object', 'Result should be object');
+        assert_equals(value.name, 'n1', 'Result should have name property');
+        assert_equals(value.b.name, 'n2', 'Result should have name property');
+        assert_equals(value.a.b.id, key, 'Key should be injected');
+        t.done();
+      });
+    });
+  },
+  'Key is injected into value - multi-segment path, partially populated');
+
+indexeddb_test(
+  (t, db) => {
+    db.createObjectStore('store', {autoIncrement: true, keyPath: 'id'});
+  },
+  (t, db) => {
+    const tx = db.transaction('store', 'readwrite', {durability: 'relaxed'});
+    const store = tx.objectStore('store');
+
+    assert_throws_dom('DataError', () => {
+      store.put(123);
+    }, 'Key path should be checked against value');
+
+    t.done();
+  },
+  'put() throws if key cannot be injected - single segment path');
+
+indexeddb_test(
+  (t, db) => {
+    db.createObjectStore('store', {autoIncrement: true, keyPath: 'a.b.id'});
+  },
+  (t, db) => {
+    const tx = db.transaction('store', 'readwrite', {durability: 'relaxed'});
+    const store = tx.objectStore('store');
+
+    assert_throws_dom('DataError', () => {
+      store.put({a: 123});
+    }, 'Key path should be checked against value');
+
+    assert_throws_dom('DataError', () => {
+      store.put({a: {b: 123} });
+    }, 'Key path should be checked against value');
+
+    t.done();
+  },
+  'put() throws if key cannot be injected - multi-segment path');
+
+</script>