diff --git a/lib/renderer/web-view/web-view-attributes.ts b/lib/renderer/web-view/web-view-attributes.ts
index 4ce18e9a9d296..5ce4a7f9d8199 100644
--- a/lib/renderer/web-view/web-view-attributes.ts
+++ b/lib/renderer/web-view/web-view-attributes.ts
@@ -17,7 +17,7 @@ interface MutationHandler {
 
 // Attribute objects.
 // Default implementation of a WebView attribute.
-class WebViewAttribute implements MutationHandler {
+export class WebViewAttribute implements MutationHandler {
   public value: any;
   public ignoreMutation = false;
 
@@ -78,7 +78,7 @@ class BooleanAttribute extends WebViewAttribute {
 }
 
 // Attribute representing the state of the storage partition.
-class PartitionAttribute extends WebViewAttribute {
+export class PartitionAttribute extends WebViewAttribute {
   public validPartitionId = true
 
   constructor (public webViewImpl: WebViewImpl) {
@@ -102,7 +102,7 @@ class PartitionAttribute extends WebViewAttribute {
 }
 
 // Attribute that handles the location and navigation of the webview.
-class SrcAttribute extends WebViewAttribute {
+export class SrcAttribute extends WebViewAttribute {
   public observer!: MutationObserver;
 
   constructor (public webViewImpl: WebViewImpl) {
@@ -168,7 +168,7 @@ class SrcAttribute extends WebViewAttribute {
   }
 
   public parse () {
-    if (!this.webViewImpl.elementAttached || !this.webViewImpl.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_PARTITION].validPartitionId || !this.getValue()) {
+    if (!this.webViewImpl.elementAttached || !(this.webViewImpl.attributes.get(WEB_VIEW_CONSTANTS.ATTRIBUTE_PARTITION) as PartitionAttribute).validPartitionId || !this.getValue()) {
       return;
     }
     if (this.webViewImpl.guestInstanceId == null) {
@@ -182,12 +182,12 @@ class SrcAttribute extends WebViewAttribute {
     // Navigate to |this.src|.
     const opts: Record<string, string> = {};
 
-    const httpreferrer = this.webViewImpl.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_HTTPREFERRER].getValue();
+    const httpreferrer = this.webViewImpl.attributes.get(WEB_VIEW_CONSTANTS.ATTRIBUTE_HTTPREFERRER)!.getValue();
     if (httpreferrer) {
       opts.httpReferrer = httpreferrer;
     }
 
-    const useragent = this.webViewImpl.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_USERAGENT].getValue();
+    const useragent = this.webViewImpl.attributes.get(WEB_VIEW_CONSTANTS.ATTRIBUTE_USERAGENT)!.getValue();
     if (useragent) {
       opts.userAgent = useragent;
     }
@@ -274,19 +274,18 @@ class EnableRemoteModuleAttribute extends WebViewAttribute {
 
 // Sets up all of the webview attributes.
 WebViewImpl.prototype.setupWebViewAttributes = function () {
-  this.attributes = {};
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_PARTITION] = new PartitionAttribute(this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_SRC] = new SrcAttribute(this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_HTTPREFERRER] = new HttpReferrerAttribute(this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_USERAGENT] = new UserAgentAttribute(this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_NODEINTEGRATION] = new BooleanAttribute(WEB_VIEW_CONSTANTS.ATTRIBUTE_NODEINTEGRATION, this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_NODEINTEGRATIONINSUBFRAMES] = new BooleanAttribute(WEB_VIEW_CONSTANTS.ATTRIBUTE_NODEINTEGRATIONINSUBFRAMES, this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_PLUGINS] = new BooleanAttribute(WEB_VIEW_CONSTANTS.ATTRIBUTE_PLUGINS, this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_DISABLEWEBSECURITY] = new BooleanAttribute(WEB_VIEW_CONSTANTS.ATTRIBUTE_DISABLEWEBSECURITY, this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_ALLOWPOPUPS] = new BooleanAttribute(WEB_VIEW_CONSTANTS.ATTRIBUTE_ALLOWPOPUPS, this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_ENABLEREMOTEMODULE] = new EnableRemoteModuleAttribute(this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_PRELOAD] = new PreloadAttribute(this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_BLINKFEATURES] = new BlinkFeaturesAttribute(this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_DISABLEBLINKFEATURES] = new DisableBlinkFeaturesAttribute(this);
-  this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_WEBPREFERENCES] = new WebPreferencesAttribute(this);
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_PARTITION, new PartitionAttribute(this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_SRC, new SrcAttribute(this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_HTTPREFERRER, new HttpReferrerAttribute(this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_USERAGENT, new UserAgentAttribute(this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_NODEINTEGRATION, new BooleanAttribute(WEB_VIEW_CONSTANTS.ATTRIBUTE_NODEINTEGRATION, this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_NODEINTEGRATIONINSUBFRAMES, new BooleanAttribute(WEB_VIEW_CONSTANTS.ATTRIBUTE_NODEINTEGRATIONINSUBFRAMES, this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_PLUGINS, new BooleanAttribute(WEB_VIEW_CONSTANTS.ATTRIBUTE_PLUGINS, this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_DISABLEWEBSECURITY, new BooleanAttribute(WEB_VIEW_CONSTANTS.ATTRIBUTE_DISABLEWEBSECURITY, this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_ALLOWPOPUPS, new BooleanAttribute(WEB_VIEW_CONSTANTS.ATTRIBUTE_ALLOWPOPUPS, this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_ENABLEREMOTEMODULE, new EnableRemoteModuleAttribute(this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_PRELOAD, new PreloadAttribute(this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_BLINKFEATURES, new BlinkFeaturesAttribute(this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_DISABLEBLINKFEATURES, new DisableBlinkFeaturesAttribute(this));
+  this.attributes.set(WEB_VIEW_CONSTANTS.ATTRIBUTE_WEBPREFERENCES, new WebPreferencesAttribute(this));
 };
diff --git a/lib/renderer/web-view/web-view-constants.ts b/lib/renderer/web-view/web-view-constants.ts
index 433d12ae3b8ce..02bf33400f488 100644
--- a/lib/renderer/web-view/web-view-constants.ts
+++ b/lib/renderer/web-view/web-view-constants.ts
@@ -16,9 +16,6 @@ export const enum WEB_VIEW_CONSTANTS {
   ATTRIBUTE_DISABLEBLINKFEATURES = 'disableblinkfeatures',
   ATTRIBUTE_WEBPREFERENCES = 'webpreferences',
 
-  // Internal attribute.
-  ATTRIBUTE_INTERNALINSTANCEID = 'internalinstanceid',
-
   // Error messages.
   ERROR_MSG_ALREADY_NAVIGATED = 'The object has already navigated, so its partition cannot be changed.',
   ERROR_MSG_CANNOT_INJECT_SCRIPT = '<webview> = ' + 'Script cannot be injected into content until the page has loaded.',
diff --git a/lib/renderer/web-view/web-view-element.ts b/lib/renderer/web-view/web-view-element.ts
index dcf3dbc753400..e723ebbbe1076 100644
--- a/lib/renderer/web-view/web-view-element.ts
+++ b/lib/renderer/web-view/web-view-element.ts
@@ -10,6 +10,7 @@
 
 import { WEB_VIEW_CONSTANTS } from '@electron/internal/renderer/web-view/web-view-constants';
 import { WebViewImpl as IWebViewImpl, webViewImplModule } from '@electron/internal/renderer/web-view/web-view-impl';
+import type { SrcAttribute } from '@electron/internal/renderer/web-view/web-view-attributes';
 
 // Return a WebViewElement class that is defined in this context.
 const defineWebViewElement = (v8Util: NodeJS.V8UtilBinding, webViewImpl: typeof webViewImplModule) => {
@@ -49,7 +50,7 @@ const defineWebViewElement = (v8Util: NodeJS.V8UtilBinding, webViewImpl: typeof
       if (!internal.elementAttached) {
         guestViewInternal.registerEvents(internal, internal.viewInstanceId);
         internal.elementAttached = true;
-        internal.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_SRC].parse();
+        (internal.attributes.get(WEB_VIEW_CONSTANTS.ATTRIBUTE_SRC) as SrcAttribute).parse();
       }
     }
 
diff --git a/lib/renderer/web-view/web-view-impl.ts b/lib/renderer/web-view/web-view-impl.ts
index ea26bcbc36677..5f5f3cd318a94 100644
--- a/lib/renderer/web-view/web-view-impl.ts
+++ b/lib/renderer/web-view/web-view-impl.ts
@@ -5,6 +5,7 @@ import * as ipcRendererUtils from '@electron/internal/renderer/ipc-renderer-inte
 import * as guestViewInternal from '@electron/internal/renderer/web-view/guest-view-internal';
 import { WEB_VIEW_CONSTANTS } from '@electron/internal/renderer/web-view/web-view-constants';
 import { syncMethods, asyncMethods, properties } from '@electron/internal/common/web-view-methods';
+import type { WebViewAttribute, PartitionAttribute } from '@electron/internal/renderer/web-view/web-view-attributes';
 import { deserialize } from '@electron/internal/common/type-utils';
 const { webFrame } = electron;
 
@@ -33,7 +34,7 @@ export class WebViewImpl {
   public internalElement: HTMLIFrameElement
 
   // Replaced in web-view-attributes
-  public attributes: Record<string, any> = {}
+  public attributes = new Map<string, WebViewAttribute>();
   public setupWebViewAttributes (): void {}
 
   constructor (public webviewNode: HTMLElement) {
@@ -76,7 +77,7 @@ export class WebViewImpl {
     }
 
     this.beforeFirstNavigation = true;
-    this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_PARTITION].validPartitionId = true;
+    (this.attributes.get(WEB_VIEW_CONSTANTS.ATTRIBUTE_PARTITION) as PartitionAttribute).validPartitionId = true;
 
     // Since attachment swaps a local frame for a remote frame, we need our
     // internal iframe element to be local again before we can reattach.
@@ -95,12 +96,12 @@ export class WebViewImpl {
   // attribute, if necessary. See BrowserPlugin::UpdateDOMAttribute for more
   // details.
   handleWebviewAttributeMutation (attributeName: string, oldValue: any, newValue: any) {
-    if (!this.attributes[attributeName] || this.attributes[attributeName].ignoreMutation) {
+    if (!this.attributes.has(attributeName) || this.attributes.get(attributeName)!.ignoreMutation) {
       return;
     }
 
     // Let the changed attribute handle its own mutation
-    this.attributes[attributeName].handleMutation(oldValue, newValue);
+    this.attributes.get(attributeName)!.handleMutation(oldValue, newValue);
   }
 
   onElementResize () {
@@ -149,7 +150,7 @@ export class WebViewImpl {
       // Touching the src attribute triggers a navigation. To avoid
       // triggering a page reload on every guest-initiated navigation,
       // we do not handle this mutation.
-      this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_SRC].setValueIgnoreMutation(newValue);
+      this.attributes.get(WEB_VIEW_CONSTANTS.ATTRIBUTE_SRC)!.setValueIgnoreMutation(newValue);
     }
   }
 
@@ -163,7 +164,7 @@ export class WebViewImpl {
   }
 
   onAttach (storagePartitionId: number) {
-    return this.attributes[WEB_VIEW_CONSTANTS.ATTRIBUTE_PARTITION].setValue(storagePartitionId);
+    return this.attributes.get(WEB_VIEW_CONSTANTS.ATTRIBUTE_PARTITION)!.setValue(storagePartitionId);
   }
 
   buildParams () {
@@ -172,10 +173,8 @@ export class WebViewImpl {
       userAgentOverride: this.userAgentOverride
     };
 
-    for (const attributeName in this.attributes) {
-      if (Object.prototype.hasOwnProperty.call(this.attributes, attributeName)) {
-        params[attributeName] = this.attributes[attributeName].getValue();
-      }
+    for (const [attributeName, attribute] of this.attributes) {
+      params[attributeName] = attribute.getValue();
     }
 
     return params;