diff --git a/lib/browser/guest-window-manager.js b/lib/browser/guest-window-manager.js
index 305da92f9e6..156e5bc708d 100644
--- a/lib/browser/guest-window-manager.js
+++ b/lib/browser/guest-window-manager.js
@@ -7,6 +7,14 @@ const parseFeaturesString = require('../common/parse-features-string')
 const hasProp = {}.hasOwnProperty
 const frameToGuest = new Map()
 
+// Security options that child windows will always inherit from parent windows
+const inheritedWebPreferences = new Map([
+  ['contextIsolation', true],
+  ['javascript', false],
+  ['nodeIntegration', false],
+  ['webviewTag', false]
+])
+
 // Copy attribute of |parent| to |child| if it is not defined in |child|.
 const mergeOptions = function (child, parent, visited) {
   // Check for circular reference.
@@ -43,19 +51,11 @@ const mergeBrowserWindowOptions = function (embedder, options) {
     mergeOptions(options.webPreferences, embedder.getWebPreferences())
   }
 
-  // Disable node integration on child window if disabled on parent window
-  if (embedder.getWebPreferences().nodeIntegration === false) {
-    options.webPreferences.nodeIntegration = false
-  }
-
-  // Enable context isolation on child window if enabled on parent window
-  if (embedder.getWebPreferences().contextIsolation === true) {
-    options.webPreferences.contextIsolation = true
-  }
-
-  // Disable JavaScript on child window if disabled on parent window
-  if (embedder.getWebPreferences().javascript === false) {
-    options.webPreferences.javascript = false
+  // Inherit certain option values from parent window
+  for (const [name, value] of inheritedWebPreferences) {
+    if (embedder.getWebPreferences()[name] === value) {
+      options.webPreferences[name] = value
+    }
   }
 
   // Sets correct openerId here to give correct options to 'new-window' event handler
@@ -191,7 +191,7 @@ ipcMain.on('ELECTRON_GUEST_WINDOW_MANAGER_WINDOW_OPEN', (event, url, frameName,
   const options = {}
 
   const ints = ['x', 'y', 'width', 'height', 'minWidth', 'maxWidth', 'minHeight', 'maxHeight', 'zoomFactor']
-  const webPreferences = ['zoomFactor', 'nodeIntegration', 'preload', 'javascript', 'contextIsolation']
+  const webPreferences = ['zoomFactor', 'nodeIntegration', 'preload', 'javascript', 'contextIsolation', 'webviewTag']
   const disposition = 'new-window'
 
   // Used to store additional features