diff --git a/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map.rs b/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map.rs
index 7e87143275..3f00adbc73 100644
--- a/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map.rs
+++ b/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map.rs
@@ -18,7 +18,7 @@ pub(in crate::native_bridge::document) use methods::{
     named_node_map_set_named_item_ns_method_callback,
 };
 #[derive(WebApiFunctionTemplate)]
-#[webapi(interface = web_api_interfaces::NamedNodeMap, enumerable)]
+#[webapi(interface = web_api_interfaces::NamedNodeMap, enumerable, receiver)]
 struct NamedNodeMapPrototypeDeclaration {
     #[webapi(accessor_property, getter = named_node_map_length_getter_callback)]
     length: (),
diff --git a/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map/cache.rs b/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map/cache.rs
index 5d57fae7b4..8dd93aa2bb 100644
--- a/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map/cache.rs
+++ b/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map/cache.rs
@@ -42,6 +42,9 @@ pub(crate) fn live_named_node_map_wrapper<'s>(
         wrapper.set_internal_field(0, element.into()),
         "NamedNodeMap wrapper must expose its owner element field"
     );
+    web_api_interfaces::NamedNodeMap::DESCRIPTOR
+        .initialize(scope, wrapper)
+        .expect("NamedNodeMap wrapper must have native identity");
     super::super::super::super::bindings::set_named_constructor_prototype(
         scope,
         wrapper,
diff --git a/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map/helpers.rs b/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map/helpers.rs
index 8e75767480..096b3de0bd 100644
--- a/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map/helpers.rs
+++ b/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map/helpers.rs
@@ -11,6 +11,7 @@ pub(super) fn named_node_map_element<'s>(
     scope: &mut v8::PinScope<'s, '_>,
     map: v8::Local<'s, v8::Object>,
 ) -> Option<v8::Local<'s, v8::Object>> {
+    let map = moli_webapi_declare::web_api_object_target(scope, map)?;
     get_private_object(scope, map, NAMED_NODE_MAP_ELEMENT_SLOT).or_else(|| {
         map.get_internal_field(scope, 0)
             .and_then(|value| v8::Local::<v8::Object>::try_from(value).ok())
diff --git a/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map/methods.rs b/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map/methods.rs
index 6d2a4302c6..83b2da54b5 100644
--- a/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map/methods.rs
+++ b/moli-renderer-v8/src/native_bridge/document/attributes/named_node_map/methods.rs
@@ -30,6 +30,13 @@ struct NamedNodeMapNamespaceArgs {
     local_name: String,
 }
 
+#[derive(webidl::WebIdlArgs)]
+#[webidl(prefix = "NamedNodeMap")]
+struct NamedNodeMapAttrArgs<'s> {
+    #[webidl(required, interface = web_api_interfaces::Attr)]
+    attr: v8::Local<'s, v8::Object>,
+}
+
 pub(in crate::native_bridge::document) fn named_node_map_item_method_callback<'a>(
     scope: &mut v8::PinScope<'a, '_>,
     args: v8::FunctionCallbackArguments<'a>,
@@ -77,15 +84,20 @@ pub(in crate::native_bridge::document) fn named_node_map_set_named_item_method_c
         rv.set_null();
         return;
     };
+    let Some(parsed) = webidl::parse_args::<NamedNodeMapAttrArgs<'a>>(scope, &args) else {
+        return;
+    };
+    let attr = moli_webapi_declare::web_api_object_target(scope, parsed.attr)
+        .expect("converted Attr has native identity");
     if let Some((runtime_ptr, _)) = detached_native_element_runtime_and_handle(scope, element) {
         crate::custom_elements::with_custom_element_reaction_scope(scope, runtime_ptr, |scope| {
-            if let Some(value) = detached_native_set_attribute_node(scope, element, args.get(0)) {
+            if let Some(value) = detached_native_set_attribute_node(scope, element, attr.into()) {
                 rv.set(value);
             }
         });
         return;
     }
-    let Some(value) = live_set_attribute_node(scope, element, args.get(0)) else {
+    let Some(value) = live_set_attribute_node(scope, element, attr.into()) else {
         rv.set_null();
         return;
     };
@@ -168,15 +180,20 @@ pub(in crate::native_bridge::document) fn named_node_map_set_named_item_ns_metho
         rv.set_null();
         return;
     };
+    let Some(parsed) = webidl::parse_args::<NamedNodeMapAttrArgs<'a>>(scope, &args) else {
+        return;
+    };
+    let attr = moli_webapi_declare::web_api_object_target(scope, parsed.attr)
+        .expect("converted Attr has native identity");
     if let Some((runtime_ptr, _)) = detached_native_element_runtime_and_handle(scope, element) {
         crate::custom_elements::with_custom_element_reaction_scope(scope, runtime_ptr, |scope| {
-            if let Some(value) = detached_native_set_attribute_node(scope, element, args.get(0)) {
+            if let Some(value) = detached_native_set_attribute_node(scope, element, attr.into()) {
                 rv.set(value);
             }
         });
         return;
     }
-    let Some(value) = live_set_attribute_node(scope, element, args.get(0)) else {
+    let Some(value) = live_set_attribute_node(scope, element, attr.into()) else {
         rv.set_null();
         return;
     };
diff --git a/moli-renderer-v8/src/script_vm/tests/browser_api/mod.rs b/moli-renderer-v8/src/script_vm/tests/browser_api/mod.rs
index e76f62d702..e3898e136a 100644
--- a/moli-renderer-v8/src/script_vm/tests/browser_api/mod.rs
+++ b/moli-renderer-v8/src/script_vm/tests/browser_api/mod.rs
@@ -83,3 +83,5 @@ mod window_current_event_private;
 mod video_codec_support;
 
 mod event_prototype_attributes;
+
+mod named_node_map_receivers;
diff --git a/moli-renderer-v8/src/script_vm/tests/browser_api/named_node_map_receivers.rs b/moli-renderer-v8/src/script_vm/tests/browser_api/named_node_map_receivers.rs
new file mode 100644
index 0000000000..6245f9fca2
--- /dev/null
+++ b/moli-renderer-v8/src/script_vm/tests/browser_api/named_node_map_receivers.rs
@@ -0,0 +1,126 @@
+use super::*;
+
+#[test]
+fn named_node_map_receivers_validate_native_identity_before_attr_conversion() {
+    let mut vm = new_parsed_test_vm(
+        "https://named-node-map-receivers.test/",
+        "<!doctype html><iframe id=child></iframe>",
+    );
+    let result = vm
+        .eval(include_str!(
+            "../../../../tests/fixtures/named-node-map-receivers.js"
+        ))
+        .expect("NamedNodeMap receiver matrix should complete");
+    assert_eq!(vm.eval("__uiEventResults.total").unwrap(), "1058");
+    assert_eq!(
+        result,
+        "true",
+        "{}",
+        vm.eval("JSON.stringify(__uiEventResults.rows.filter(row => !row.passed))")
+            .unwrap(),
+    );
+}
+
+#[test]
+fn named_node_map_receivers_and_attr_arguments_accept_registered_native_proxies() {
+    let mut vm = new_parsed_test_vm(
+        "https://named-node-map-native-proxies.test/",
+        "<!doctype html><iframe id=child></iframe>",
+    );
+    vm.eval(
+        r#"
+        globalThis.nativeMapRecords = [];
+        globalThis.nativeMapTraps = 0;
+        const other = document.querySelector('#child').contentWindow;
+        function handler() {
+          return {
+            get() {nativeMapTraps++; throw new Error('get trap');},
+            getPrototypeOf() {nativeMapTraps++; throw new Error('prototype trap');}
+          };
+        }
+        for (const owner of [globalThis, other]) {
+          for (const flavor of ['live', 'html', 'xml', 'parsed']) {
+            const doc = flavor === 'live' ? owner.document :
+              flavor === 'html' ? owner.document.implementation.createHTMLDocument('attributes') :
+              flavor === 'xml' ? owner.document.implementation.createDocument(null, 'root') :
+              new owner.DOMParser().parseFromString('<root/>', 'application/xml');
+            const root = flavor === 'xml' || flavor === 'parsed' ? doc.documentElement : doc.createElement('div');
+            root.setAttribute('data-x', 'one');
+            const map = root.attributes;
+            const attr = doc.createAttributeNS('urn:native', 'n:data-native'); attr.value = 'native';
+            const nativeMap = Proxy.revocable(map, handler());
+            const nativeAttr = Proxy.revocable(attr, handler());
+            nativeMapRecords.push({root, map, attr, mapProxy: nativeMap.proxy, attrProxy: nativeAttr.proxy,
+              mapRevoke: nativeMap.revoke, attrRevoke: nativeAttr.revoke,
+              callee: owner === globalThis ? other : globalThis});
+          }
+        }
+        true;
+        "#,
+    )
+    .unwrap();
+    vm.with_default_context_scope_and_checkpoint_for_test(|scope, _host_ptr| {
+        let global = scope.get_current_context().global(scope);
+        let key = v8::String::new(scope, "nativeMapRecords").unwrap();
+        let value = global.get(scope, key.into()).unwrap();
+        let records = v8::Local::<v8::Array>::try_from(value).unwrap();
+        assert_eq!(records.length(), 8);
+        for index in 0..records.length() {
+            let value = records.get_index(scope, index).unwrap();
+            let record = v8::Local::<v8::Object>::try_from(value).unwrap();
+            for (name, is_map) in [("mapProxy", true), ("attrProxy", false)] {
+                let key = v8::String::new(scope, name).unwrap();
+                let value = record.get(scope, key.into()).unwrap();
+                let proxy = v8::Local::<v8::Proxy>::try_from(value).unwrap();
+                moli_webapi_declare::register_web_api_proxy(scope, proxy).unwrap();
+                assert_eq!(
+                    crate::web_api_interfaces::NamedNodeMap::is_instance(scope, proxy.into()),
+                    is_map,
+                );
+                assert_eq!(
+                    crate::web_api_interfaces::Attr::is_instance(scope, proxy.into()),
+                    !is_map,
+                );
+            }
+        }
+        Ok(())
+    })
+    .unwrap();
+    assert_eq!(
+        vm.eval(
+            r#"(() => {
+              for (const record of nativeMapRecords) {
+                const {root, map, attr, mapProxy, attrProxy, mapRevoke, attrRevoke, callee} = record;
+                const prototype = callee.NamedNodeMap.prototype;
+                const length = Object.getOwnPropertyDescriptor(prototype, 'length').get;
+                const fails = body => {
+                  try { body(); return false; }
+                  catch (error) { return Object.getPrototypeOf(error) === callee.TypeError.prototype; }
+                };
+                if (length.call(mapProxy) !== 1 || prototype.item.call(mapProxy, 0) !== root.getAttributeNode('data-x')) return false;
+                if (prototype.setNamedItem.call(mapProxy, attrProxy) !== null || attr.ownerElement !== root) return false;
+                if (prototype.getNamedItem.call(mapProxy, 'n:data-native') !== attr) return false;
+                if (prototype.removeNamedItem.call(mapProxy, 'n:data-native') !== attr || attr.ownerElement !== null) return false;
+                if (prototype.setNamedItemNS.call(mapProxy, attrProxy) !== null || attr.ownerElement !== root) return false;
+                if (prototype.getNamedItemNS.call(mapProxy, 'urn:native', 'data-native') !== attr) return false;
+                if (prototype.removeNamedItemNS.call(mapProxy, 'urn:native', 'data-native') !== attr || attr.ownerElement !== null) return false;
+                if (length.call(mapProxy) !== 1 || root.attributes !== map) return false;
+                let conversions = 0;
+                const name = {toString() {conversions++; throw 1;}};
+                if (!fails(() => length.call(new Proxy(mapProxy, {})))) return false;
+                if (!fails(() => prototype.getNamedItem.call(new Proxy(mapProxy, {}), name))) return false;
+                if (!fails(() => prototype.setNamedItem.call(mapProxy, new Proxy(attrProxy, {})))) return false;
+                if (!fails(() => prototype.setNamedItemNS.call(mapProxy, root))) return false;
+                if (conversions !== 0 || nativeMapTraps !== 0) return false;
+                attrRevoke();
+                if (!fails(() => prototype.setNamedItem.call(mapProxy, attrProxy))) return false;
+                mapRevoke();
+                if (!fails(() => length.call(mapProxy))) return false;
+              }
+              return nativeMapTraps === 0;
+            })()"#,
+        )
+        .unwrap(),
+        "true",
+    );
+}
diff --git a/moli-renderer-v8/tests/fixtures/named-node-map-receivers.js b/moli-renderer-v8/tests/fixtures/named-node-map-receivers.js
new file mode 100644
index 0000000000..71cc74eff0
--- /dev/null
+++ b/moli-renderer-v8/tests/fixtures/named-node-map-receivers.js
@@ -0,0 +1,166 @@
+(() => {
+  const rows = [];
+  const check = (name, body) => {
+    try { rows.push({name, passed: body() === true}); }
+    catch (error) { rows.push({name, passed: false, error: String(error)}); }
+  };
+  const typeError = (body, realm) => {
+    try { body(); return false; }
+    catch (error) { return Object.getPrototypeOf(error) === realm.TypeError.prototype; }
+  };
+  const realms = [['top', globalThis], ['child', document.querySelector('#child').contentWindow]];
+  const entries = [['item', 1], ['getNamedItem', 1], ['getNamedItemNS', 2],
+    ['setNamedItem', 1], ['setNamedItemNS', 1], ['removeNamedItem', 1], ['removeNamedItemNS', 2]];
+  const setup = (owner, flavor = 'live') => {
+    const doc = flavor === 'live' ? owner.document :
+      flavor === 'html' ? owner.document.implementation.createHTMLDocument('attributes') :
+      flavor === 'xml' ? owner.document.implementation.createDocument(null, 'root') :
+      new owner.DOMParser().parseFromString('<root/>', 'application/xml');
+    const root = flavor === 'xml' || flavor === 'parsed' ? doc.documentElement : doc.createElement('div');
+    root.setAttribute('data-x', 'one');
+    root.setAttributeNS('urn:map', 'p:y', 'two');
+    return {doc, root, map: root.attributes};
+  };
+  for (const [calleeName, callee] of realms) {
+    const prototype = callee.NamedNodeMap.prototype;
+    const length = Object.getOwnPropertyDescriptor(prototype, 'length').get;
+    const methods = Object.fromEntries(entries.map(([name]) => [name, prototype[name]]));
+    check(`${calleeName} length prototype descriptor`, () => {
+      const d = Object.getOwnPropertyDescriptor(prototype, 'length');
+      return d.enumerable && d.configurable && d.get.name === 'get length' && d.get.length === 0 &&
+        d.set === undefined && Object.getPrototypeOf(d.get) === callee.Function.prototype;
+    });
+    for (const [name, arity] of entries) {
+      check(`${calleeName} ${name} prototype descriptor`, () => {
+        const d = Object.getOwnPropertyDescriptor(prototype, name);
+        return d.enumerable && d.configurable && d.writable && d.value.name === name &&
+          d.value.length === arity && Object.getPrototypeOf(d.value) === callee.Function.prototype;
+      });
+    }
+    for (const [ownerName, owner] of realms) {
+      for (const flavor of ['live', 'html', 'xml', 'parsed']) {
+        const label = `${calleeName} borrows ${ownerName} ${flavor}`;
+        const {doc, root, map} = setup(owner, flavor);
+        check(`${label} factory realm and SameObject`, () =>
+          Object.getPrototypeOf(map) === owner.NamedNodeMap.prototype &&
+          map instanceof owner.NamedNodeMap && root.attributes === map);
+        check(`${label} borrowed getters and lookups retain Attr identity`, () =>
+          length.call(map) === 2 && methods.item.call(map, 0) === root.getAttributeNode('data-x') &&
+          methods.getNamedItem.call(map, 'data-x') === map[0] &&
+          methods.getNamedItemNS.call(map, 'urn:map', 'y') === root.getAttributeNodeNS('urn:map', 'y'));
+        check(`${label} live mutation retains cached Attr identity`, () => {
+          const attr = methods.getNamedItem.call(map, 'data-x');
+          root.setAttribute('data-x', 'updated'); root.setAttribute('data-late', 'later');
+          return root.attributes === map && length.call(map) === 3 &&
+            methods.getNamedItem.call(map, 'data-x') === attr && attr.value === 'updated' &&
+            methods.getNamedItem.call(map, 'data-late').value === 'later';
+        });
+        check(`${label} set and remove preserve owner and return value`, () => {
+          const sample = setup(owner, flavor), attr = sample.doc.createAttribute('data-new'); attr.value = 'new';
+          return methods.setNamedItem.call(sample.map, attr) === null && attr.ownerElement === sample.root &&
+            length.call(sample.map) === 3 && methods.getNamedItem.call(sample.map, 'data-new') === attr &&
+            methods.removeNamedItem.call(sample.map, 'data-new') === attr && attr.ownerElement === null &&
+            length.call(sample.map) === 2;
+        });
+        check(`${label} namespace mutation preserves owner and return value`, () => {
+          const sample = setup(owner, flavor), attr = sample.doc.createAttributeNS('urn:new', 'n:later'); attr.value = 'new';
+          return methods.setNamedItemNS.call(sample.map, attr) === null && attr.ownerElement === sample.root &&
+            methods.getNamedItemNS.call(sample.map, 'urn:new', 'later') === attr &&
+            methods.removeNamedItemNS.call(sample.map, 'urn:new', 'later') === attr &&
+            attr.ownerElement === null && length.call(sample.map) === 2;
+        });
+        check(`${label} replacement returns the previous Attr`, () => {
+          const sample = setup(owner, flavor), old = sample.root.getAttributeNode('data-x');
+          const next = sample.doc.createAttribute('data-x'); next.value = 'replacement';
+          return methods.setNamedItem.call(sample.map, next) === old && old.ownerElement === null &&
+            next.ownerElement === sample.root && methods.getNamedItem.call(sample.map, 'data-x') === next &&
+            length.call(sample.map) === 2;
+        });
+        check(`${label} prototype removal preserves native backing`, () => {
+          const sample = setup(owner, flavor); Object.setPrototypeOf(sample.map, null);
+          const attr = sample.doc.createAttribute('data-new');
+          return length.call(sample.map) === 2 && methods.getNamedItem.call(sample.map, 'data-x') === sample.map[0] &&
+            methods.setNamedItem.call(sample.map, attr) === null &&
+            methods.removeNamedItem.call(sample.map, 'data-new') === attr;
+        });
+        check(`${label} author Proxy still forwards own indexed and named data`, () => {
+          const sample = setup(owner, flavor), proxy = new Proxy(sample.map, {});
+          return proxy[0] === sample.map[0] && proxy['data-x'] === sample.map['data-x'];
+        });
+        check(`${label} intrinsic iterator preserves Attr values`, () => {
+          const sample = setup(owner, flavor), iterate = prototype[Symbol.iterator];
+          const values = Array.from(iterate.call(sample.map));
+          return iterate === callee.Array.prototype.values && values.length === 2 &&
+            values[0] === methods.item.call(sample.map, 0) && values[1] === methods.item.call(sample.map, 1);
+        });
+      }
+      const sample = setup(owner);
+      let traps = 0, conversions = 0;
+      const handler = {get() {traps++; throw 1;}, getPrototypeOf() {traps++; throw 1;}, has() {traps++; throw 1;}};
+      const proxy = new Proxy(sample.map, handler);
+      const revoked = Proxy.revocable(sample.map, handler); revoked.revoke();
+      const invalid = [['null', null], ['undefined', undefined], ['plain', {}], ['number', 1],
+        ['prototype', owner.NamedNodeMap.prototype], ['forged', Object.create(owner.NamedNodeMap.prototype)],
+        ['inherited instance', Object.create(sample.map)], ['author Proxy', proxy], ['revoked Proxy', revoked.proxy],
+        ['Node', sample.root], ['Attr', sample.root.getAttributeNode('data-x')],
+        ['NodeIterator', owner.document.createNodeIterator(sample.root)], ['DOMTokenList', sample.root.classList]];
+      const converted = {toString() {conversions++; throw 1;}, valueOf() {conversions++; throw 1;}};
+      for (const [receiverName, receiver] of invalid) {
+        check(`${calleeName} length rejects ${ownerName} ${receiverName} in callee realm`, () =>
+          typeError(() => length.call(receiver), callee));
+        for (const [name] of entries) {
+          const attr = sample.doc.createAttribute('data-never');
+          const args = name === 'item' ? [0] : name.endsWith('NS') ?
+            name.startsWith('set') ? [attr] : ['urn:map', 'y'] : name.startsWith('set') ? [attr] : ['data-x'];
+          check(`${calleeName} ${name} rejects ${ownerName} ${receiverName} with valid arguments`, () =>
+            typeError(() => methods[name].call(receiver, ...args), callee));
+          const poisoned = name.startsWith('set') ? [new Proxy(attr, handler)] :
+            name.endsWith('NS') ? [converted, converted] : [converted];
+          check(`${calleeName} ${name} rejects ${ownerName} ${receiverName} before conversion`, () =>
+            typeError(() => methods[name].call(receiver, ...poisoned), callee) && conversions === 0 && traps === 0);
+        }
+      }
+      check(`${calleeName} ${ownerName} receiver validation executes no author traps or conversions`, () =>
+        traps === 0 && conversions === 0 && length.call(sample.map) === 2 && sample.root.getAttribute('data-x') === 'one');
+      for (const [name, arity] of entries) {
+        for (let supplied = 0; supplied < arity; supplied++) {
+          check(`${calleeName} ${name} enforces ${ownerName} required arguments after ${supplied} supplied`, () =>
+            typeError(() => methods[name].call(sample.map, ...Array(supplied).fill(null)), callee));
+        }
+      }
+      const realAttr = sample.doc.createAttribute('data-invalid');
+      const revokedAttr = Proxy.revocable(realAttr, handler); revokedAttr.revoke();
+      const badAttributes = [['undefined', undefined], ['null', null], ['plain', {}], ['Node', sample.root],
+        ['prototype', owner.Attr.prototype], ['forged', Object.create(owner.Attr.prototype)],
+        ['inherited instance', Object.create(realAttr)], ['author Proxy', new Proxy(realAttr, handler)],
+        ['revoked Proxy', revokedAttr.proxy]];
+      for (const name of ['setNamedItem', 'setNamedItemNS']) {
+        for (const [argumentName, argument] of badAttributes) {
+          check(`${calleeName} ${name} rejects ${ownerName} ${argumentName} Attr argument before mutation`, () =>
+            typeError(() => methods[name].call(sample.map, argument), callee) && traps === 0 &&
+              length.call(sample.map) === 2 && sample.root.getAttribute('data-x') === 'one');
+        }
+      }
+      check(`${calleeName} ${ownerName} valid argument conversion retains order`, () => {
+        const trace = [];
+        const namespace = {toString() {trace.push('namespace'); return 'urn:map';}};
+        const localName = {toString() {trace.push('name'); return 'y';}};
+        return methods.getNamedItemNS.call(sample.map, namespace, localName) === sample.root.getAttributeNodeNS('urn:map', 'y') &&
+          trace.join(',') === 'namespace,name';
+      });
+    }
+    check(`${calleeName} factory uses intrinsic identity after constructor replacement`, () => {
+      const saved = Object.getOwnPropertyDescriptor(callee, 'NamedNodeMap');
+      try {
+        Object.defineProperty(callee, 'NamedNodeMap', {...saved, value: function FakeMap() { throw 1; }});
+        const sample = setup(callee);
+        return Object.getPrototypeOf(sample.map) === prototype && length.call(sample.map) === 2 &&
+          methods.getNamedItem.call(sample.map, 'data-x') === sample.map[0];
+      } finally { Object.defineProperty(callee, 'NamedNodeMap', saved); }
+    });
+  }
+  if (new Set(rows.map(row => row.name)).size !== rows.length) throw new Error('Duplicate NamedNodeMap probe names');
+  globalThis.__uiEventResults = {complete: true, total: rows.length,
+    passed: rows.filter(row => row.passed).length, rows};
+  return rows.every(row => row.passed);
+})()