feat: enhance native window.open to match the custom implementation's behavior (#19703)

Co-authored-by: Andy Locascio <andy@slack-corp.com>

docs/api/structures/post-body.md

@@ -0,0 +1,23 @@
+# PostBody Object
+
+* `data` Array<[PostData](./post-data.md)> - The post data to be sent to the
+  new window.
+* `contentType` String - The `content-type` header used for the data. One of
+  `application/x-www-form-urlencoded` or `multipart/form-data`. Corresponds to
+  the `enctype` attribute of the submitted HTML form.
+* `boundary` String (optional) - The boundary used to separate multiple parts of
+  the message. Only valid when `contentType` is `multipart/form-data`.
+
+Note that keys starting with `--` are not currently supported. For example, this will errantly submit as `multipart/form-data` when `nativeWindowOpen` is set to `false` in webPreferences:
+
+```html
+<form
+  target="_blank"
+  method="POST"
+  enctype="application/x-www-form-urlencoded"
+  action="https://postman-echo.com/post"
+>
+  <input type="text" name="--theKey">
+  <input type="submit">
+</form>
+```

docs/api/structures/post-data.md

@@ -0,0 +1,21 @@
+# PostData Object
+
+* `type` String - One of the following:
+  * `rawData` - The data is available as a `Buffer`, in the `rawData` field.
+  * `file` - The object represents a file. The `filePath`, `offset`, `length`
+    and `modificationTime` fields will be used to describe the file.
+  * `blob` - The object represents a `Blob`. The `blobUUID` field will be used
+    to describe the `Blob`.
+* `bytes` String (optional) - The raw bytes of the post data in a `Buffer`.
+  Required for the `rawData` type.
+* `filePath` String (optional) - The path of the file being uploaded. Required
+  for the `file` type.
+* `blobUUID` String (optional) - The `UUID` of the `Blob` being uploaded.
+  Required for the `blob` type.
+* `offset` Integer (optional) - The offset from the beginning of the file being
+  uploaded, in bytes. Only valid for `file` types.
+* `length` Integer (optional) - The length of the file being uploaded, in bytes.
+  If set to `-1`, the whole file will be uploaded. Only valid for `file` types.
+* `modificationTime` Double (optional) - The modification time of the file
+  represented by a double, which is the number of seconds since the `UNIX Epoch`
+  (Jan 1, 1970). Only valid for `file` types.

docs/api/web-contents.md

@@ -150,6 +150,10 @@ Returns:
 * `referrer` [Referrer](structures/referrer.md) - The referrer that will be
   passed to the new window. May or may not result in the `Referer` header being
   sent, depending on the referrer policy.
+* `postBody` [PostBody](structures/post-body.md) (optional) - The post data that
+  will be sent to the new window, along with the appropriate headers that will
+  be set. If no post data is to be sent, the value will be `null`. Only defined
+  when the window is being created by a form that set `target=_blank`.
 
 Emitted when the page requests to open a new window for a `url`. It could be
 requested by `window.open` or an external link like `<a target='_blank'>`.
@@ -162,7 +166,7 @@ new [`BrowserWindow`](browser-window.md). If you call `event.preventDefault()` a
 instance, failing to do so may result in unexpected behavior. For example:
 
 ```javascript
-myBrowserWindow.webContents.on('new-window', (event, url, frameName, disposition, options) => {
+myBrowserWindow.webContents.on('new-window', (event, url, frameName, disposition, options, additionalFeatures, referrer, postBody) => {
   event.preventDefault()
   const win = new BrowserWindow({
     webContents: options.webContents, // use existing webContents if provided
@@ -170,7 +174,16 @@ myBrowserWindow.webContents.on('new-window', (event, url, frameName, disposition
   })
   win.once('ready-to-show', () => win.show())
   if (!options.webContents) {
-    win.loadURL(url) // existing webContents will be navigated automatically
+    const loadOptions = {
+      httpReferrer: referrer
+    }
+    if (postBody != null) {
+      const { data, contentType, boundary } = postBody
+      loadOptions.postData = postBody.data
+      loadOptions.extraHeaders = `content-type: ${contentType}; boundary=${boundary}`
+    }
+
+    win.loadURL(url, loadOptions) // existing webContents will be navigated automatically
   }
   event.newGuest = win
 })

filenames.auto.gni

@@ -102,6 +102,8 @@ auto_filenames = {
     "docs/api/structures/mouse-wheel-input-event.md",
     "docs/api/structures/notification-action.md",
     "docs/api/structures/point.md",
+    "docs/api/structures/post-body.md",
+    "docs/api/structures/post-data.md",
     "docs/api/structures/printer-info.md",
     "docs/api/structures/process-memory-info.md",
     "docs/api/structures/process-metric.md",

lib/browser/api/net.js

@@ -126,7 +126,6 @@ class SlurpStream extends Writable {
     this._data = Buffer.concat([this._data, chunk]);
     callback();
   }
-
   data () { return this._data; }
 }
 

lib/browser/api/web-contents.js

@@ -11,6 +11,7 @@ const { internalWindowOpen } = require('@electron/internal/browser/guest-window-
 const NavigationController = require('@electron/internal/browser/navigation-controller');
 const { ipcMainInternal } = require('@electron/internal/browser/ipc-main-internal');
 const ipcMainUtils = require('@electron/internal/browser/ipc-main-internal-utils');
+const { convertFeaturesString } = require('@electron/internal/common/parse-features-string');
 const { MessagePortMain } = require('@electron/internal/browser/message-port-main');
 
 // session is not used here, the purpose is to make sure session is initalized
@@ -506,40 +507,42 @@ WebContents.prototype._init = function () {
     this.reload();
   });
 
-  // Handle window.open for BrowserWindow and BrowserView.
+  if (this.getType() !== 'remote') {
-  if (['browserView', 'window'].includes(this.getType())) {
     // Make new windows requested by links behave like "window.open".
     this.on('-new-window', (event, url, frameName, disposition,
-      additionalFeatures, postData,
+      rawFeatures, referrer, postData) => {
-      referrer) => {
+      const { options, additionalFeatures } = convertFeaturesString(rawFeatures, frameName);
-      const options = {
+      const mergedOptions = {
         show: true,
         width: 800,
-        height: 600
+        height: 600,
+        ...options
       };
-      internalWindowOpen(event, url, referrer, frameName, disposition, options, additionalFeatures, postData);
+
+      internalWindowOpen(event, url, referrer, frameName, disposition, mergedOptions, additionalFeatures, postData);
     });
 
     // Create a new browser window for the native implementation of
     // "window.open", used in sandbox and nativeWindowOpen mode.
     this.on('-add-new-contents', (event, webContents, disposition,
-      userGesture, left, top, width, height, url, frameName) => {
+      userGesture, left, top, width, height, url, frameName,
+      referrer, rawFeatures, postData) => {
       if ((disposition !== 'foreground-tab' && disposition !== 'new-window' &&
            disposition !== 'background-tab')) {
         event.preventDefault();
         return;
       }
 
-      const options = {
+      const { options, additionalFeatures } = convertFeaturesString(rawFeatures, frameName);
+      const mergedOptions = {
         show: true,
-        x: left,
+        width: 800,
-        y: top,
+        height: 600,
-        width: width || 800,
+        webContents,
-        height: height || 600,
+        ...options
-        webContents
       };
-      const referrer = { url: '', policy: 'default' };
+
-      internalWindowOpen(event, url, referrer, frameName, disposition, options);
+      internalWindowOpen(event, url, referrer, frameName, disposition, mergedOptions, additionalFeatures, postData);
     });
   }
 

lib/browser/guest-view-manager.js

@@ -3,7 +3,7 @@
 const { webContents } = require('electron');
 const { ipcMainInternal } = require('@electron/internal/browser/ipc-main-internal');
 const ipcMainUtils = require('@electron/internal/browser/ipc-main-internal-utils');
-const parseFeaturesString = require('@electron/internal/common/parse-features-string');
+const { parseFeaturesString } = require('@electron/internal/common/parse-features-string');
 const { syncMethods, asyncMethods, properties } = require('@electron/internal/common/web-view-methods');
 const { serialize } = require('@electron/internal/common/type-utils');
 
@@ -141,17 +141,6 @@ const createGuest = function (embedder, params) {
     }
   });
 
-  // Forward internal web contents event to embedder to handle
-  // native window.open setup
-  guest.on('-add-new-contents', (...args) => {
-    if (guest.getLastWebPreferences().nativeWindowOpen === true) {
-      const embedder = getEmbedder(guestInstanceId);
-      if (embedder != null) {
-        embedder.emit('-add-new-contents', ...args);
-      }
-    }
-  });
-
   return guestInstanceId;
 };
 

lib/browser/guest-window-manager.js

@@ -5,7 +5,7 @@ const { BrowserWindow } = electron;
 const { isSameOrigin } = process.electronBinding('v8_util');
 const { ipcMainInternal } = require('@electron/internal/browser/ipc-main-internal');
 const ipcMainUtils = require('@electron/internal/browser/ipc-main-internal-utils');
-const parseFeaturesString = require('@electron/internal/common/parse-features-string');
+const { convertFeaturesString } = require('@electron/internal/common/parse-features-string');
 
 const hasProp = {}.hasOwnProperty;
 const frameToGuest = new Map();
@@ -57,7 +57,11 @@ const mergeBrowserWindowOptions = function (embedder, options) {
     // if parent's visibility is available, that overrides 'show' flag (#12125)
     const win = BrowserWindow.fromWebContents(embedder.webContents);
     if (win != null) {
-      parentOptions = { ...embedder.browserWindowOptions, show: win.isVisible() };
+      parentOptions = {
+        ...win.getBounds(),
+        ...embedder.browserWindowOptions,
+        show: win.isVisible()
+      };
     }
 
     // Inherit the original options if it is a BrowserWindow.
@@ -83,6 +87,40 @@ const mergeBrowserWindowOptions = function (embedder, options) {
   return options;
 };
 
+const MULTIPART_CONTENT_TYPE = 'multipart/form-data';
+const URL_ENCODED_CONTENT_TYPE = 'application/x-www-form-urlencoded';
+function makeContentTypeHeader ({ contentType, boundary }) {
+  const header = `content-type: ${contentType};`;
+  if (contentType === MULTIPART_CONTENT_TYPE) {
+    return `${header} boundary=${boundary}`;
+  }
+  return header;
+}
+
+// Figure out appropriate headers for post data.
+const parseContentTypeFormat = function (postData) {
+  if (postData.length) {
+    // For multipart forms, the first element will start with the boundary
+    // notice, which looks something like `------WebKitFormBoundary12345678`
+    // Note, this regex would fail when submitting a urlencoded form with an
+    // input attribute of name="--theKey", but, uhh, don't do that?
+    const postDataFront = postData[0].bytes.toString();
+    const boundary = /^--.*[^-\r\n]/.exec(postDataFront);
+    if (boundary) {
+      return {
+        boundary: boundary[0].substr(2),
+        contentType: MULTIPART_CONTENT_TYPE
+      };
+    }
+  }
+  // Either the form submission didn't contain any inputs (the postData array
+  // was empty), or we couldn't find the boundary and thus we can assume this is
+  // a key=value style form.
+  return {
+    contentType: URL_ENCODED_CONTENT_TYPE
+  };
+};
+
 // Setup a new guest with |embedder|
 const setupGuest = function (embedder, frameName, guest, options) {
   // When |embedder| is destroyed we should also destroy attached guest, and if
@@ -134,14 +172,7 @@ const createGuest = function (embedder, url, referrer, frameName, options, postD
     };
     if (postData != null) {
       loadOptions.postData = postData;
-      loadOptions.extraHeaders = 'content-type: application/x-www-form-urlencoded';
+      loadOptions.extraHeaders = makeContentTypeHeader(parseContentTypeFormat(postData));
-      if (postData.length > 0) {
-        const postDataFront = postData[0].bytes.toString();
-        const boundary = /^--.*[^-\r\n]/.exec(postDataFront);
-        if (boundary != null) {
-          loadOptions.extraHeaders = `content-type: multipart/form-data; boundary=${boundary[0].substr(2)}`;
-        }
-      }
     }
     guest.loadURL(url, loadOptions);
   }
@@ -192,68 +223,21 @@ ipcMainInternal.on('ELECTRON_GUEST_WINDOW_MANAGER_WINDOW_OPEN', (event, url, fra
   if (frameName == null) frameName = '';
   if (features == null) features = '';
 
-  const options = {};
-
-  const ints = ['x', 'y', 'width', 'height', 'minWidth', 'maxWidth', 'minHeight', 'maxHeight', 'zoomFactor'];
-  const webPreferences = ['zoomFactor', 'nodeIntegration', 'enableRemoteModule', 'preload', 'javascript', 'contextIsolation', 'webviewTag'];
   const disposition = 'new-window';
-
+  const { options, additionalFeatures } = convertFeaturesString(features, frameName);
-  // Used to store additional features
-  const additionalFeatures = [];
-
-  // Parse the features
-  parseFeaturesString(features, function (key, value) {
-    if (value === undefined) {
-      additionalFeatures.push(key);
-    } else {
-      // Don't allow webPreferences to be set since it must be an object
-      // that cannot be directly overridden
-      if (key === 'webPreferences') return;
-
-      if (webPreferences.includes(key)) {
-        if (options.webPreferences == null) {
-          options.webPreferences = {};
-        }
-        options.webPreferences[key] = value;
-      } else {
-        options[key] = value;
-      }
-    }
-  });
-  if (options.left) {
-    if (options.x == null) {
-      options.x = options.left;
-    }
-  }
-  if (options.top) {
-    if (options.y == null) {
-      options.y = options.top;
-    }
-  }
-  if (options.title == null) {
-    options.title = frameName;
-  }
-  if (options.width == null) {
-    options.width = 800;
-  }
-  if (options.height == null) {
-    options.height = 600;
-  }
-
-  for (const name of ints) {
-    if (options[name] != null) {
-      options[name] = parseInt(options[name], 10);
-    }
-  }
-
   const referrer = { url: '', policy: 'default' };
-  internalWindowOpen(event, url, referrer, frameName, disposition, options, additionalFeatures);
+  internalWindowOpen(event, url, referrer, frameName, disposition, options, additionalFeatures, null);
 });
 
 // Routed window.open messages with fully parsed options
 function internalWindowOpen (event, url, referrer, frameName, disposition, options, additionalFeatures, postData) {
   options = mergeBrowserWindowOptions(event.sender, options);
-  event.sender.emit('new-window', event, url, frameName, disposition, options, additionalFeatures, referrer);
+  const postBody = postData ? {
+    data: postData,
+    ...parseContentTypeFormat(postData)
+  } : null;
+
+  event.sender.emit('new-window', event, url, frameName, disposition, options, additionalFeatures, referrer, postBody);
   const { newGuest } = event;
   if ((event.sender.getType() === 'webview' && event.sender.getLastWebPreferences().disablePopups) || event.defaultPrevented) {
     if (newGuest != null) {

lib/common/parse-features-string.js

@@ -3,7 +3,7 @@
 // parses a feature string that has the format used in window.open()
 // - `features` input string
 // - `emit` function(key, value) - called for each parsed KV
-module.exports = function parseFeaturesString (features, emit) {
+function parseFeaturesString (features, emit) {
   features = `${features}`.trim();
   // split the string by ','
   features.split(/\s*,\s*/).forEach((feature) => {
@@ -18,4 +18,68 @@ module.exports = function parseFeaturesString (features, emit) {
     // emit the parsed pair
     emit(key, value);
   });
+}
+
+function convertFeaturesString (features, frameName) {
+  const options = {};
+
+  const ints = ['x', 'y', 'width', 'height', 'minWidth', 'maxWidth', 'minHeight', 'maxHeight', 'zoomFactor'];
+  const webPreferences = ['zoomFactor', 'nodeIntegration', 'enableRemoteModule', 'preload', 'javascript', 'contextIsolation', 'webviewTag'];
+
+  // Used to store additional features
+  const additionalFeatures = [];
+
+  // Parse the features
+  parseFeaturesString(features, function (key, value) {
+    if (value === undefined) {
+      additionalFeatures.push(key);
+    } else {
+      // Don't allow webPreferences to be set since it must be an object
+      // that cannot be directly overridden
+      if (key === 'webPreferences') return;
+
+      if (webPreferences.includes(key)) {
+        if (options.webPreferences == null) {
+          options.webPreferences = {};
+        }
+        options.webPreferences[key] = value;
+      } else {
+        options[key] = value;
+      }
+    }
+  });
+
+  if (options.left) {
+    if (options.x == null) {
+      options.x = options.left;
+    }
+  }
+  if (options.top) {
+    if (options.y == null) {
+      options.y = options.top;
+    }
+  }
+  if (options.title == null) {
+    options.title = frameName;
+  }
+  if (options.width == null) {
+    options.width = 800;
+  }
+  if (options.height == null) {
+    options.height = 600;
+  }
+
+  for (const name of ints) {
+    if (options[name] != null) {
+      options[name] = parseInt(options[name], 10);
+    }
+  }
+
+  return {
+    options, additionalFeatures
+  };
+}
+
+module.exports = {
+  parseFeaturesString, convertFeaturesString
 };

patches/chromium/can_create_window.patch

@@ -16,10 +16,27 @@ index 47749c430a71c3060c3e258ce1671bf6b03fa8c8..f2aedf5321a13742c6e3c2c4b7492b23
            last_committed_origin_, params->window_container_type,
            params->target_url, params->referrer.To<Referrer>(),
            params->frame_name, params->disposition, *params->features,
-+          params->additional_features, params->body,
++          params->raw_features, params->body,
            effective_transient_activation_state, params->opener_suppressed,
            &no_javascript_access);
 
+diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
+index 4311fd59dfd8db1dfbebd898c43c3b48caf6cdd7..2ddb86702558920cb372d2c8b3423b2d53d68e56 100644
+--- a/content/browser/web_contents/web_contents_impl.cc
++++ b/content/browser/web_contents/web_contents_impl.cc
+@@ -2910,9 +2910,9 @@ void WebContentsImpl::CreateNewWindow(
+   }
+
+   if (delegate_) {
+-    delegate_->WebContentsCreated(this, render_process_id,
+-                                  opener->GetRoutingID(), params.frame_name,
+-                                  params.target_url, new_contents_impl);
++    delegate_->WebContentsCreatedWithFullParams(this, render_process_id,
++                                                opener->GetRoutingID(),
++                                                params, new_contents_impl);
+   }
+
+   for (auto& observer : observers_) {
 diff --git a/content/common/frame.mojom b/content/common/frame.mojom
 index 00d9c34304266b49e3f9703ef1aea6524d026ed5..44bb5868b8c3699230d74de0f0903af572d000fc 100644
 --- a/content/common/frame.mojom
@@ -30,7 +47,7 @@ index 00d9c34304266b49e3f9703ef1aea6524d026ed5..44bb5868b8c3699230d74de0f0903af5
    blink.mojom.WindowFeatures features;
 +
 +  // Extra fields added by Electron.
-+  array<string> additional_features;
++  string raw_features;
 +  network.mojom.URLRequestBody? body;
  };
 
@@ -43,7 +60,7 @@ index 702cd0792df47809d9278dd3af40e0e70494e229..75cd0ad7a8dc1efd89683d8da1920506
      const std::string& frame_name,
      WindowOpenDisposition disposition,
      const blink::mojom::WindowFeatures& features,
-+    const std::vector<std::string>& additional_features,
++    const std::string& raw_features,
 +    const scoped_refptr<network::ResourceRequestBody>& body,
      bool user_gesture,
      bool opener_suppressed,
@@ -64,11 +81,59 @@ index ed0460f7e3c9e2149eed89f7d35a4bb457f6b29f..5fc3d0e31927b618d04024fcc42b2061
        const std::string& frame_name,
        WindowOpenDisposition disposition,
        const blink::mojom::WindowFeatures& features,
-+      const std::vector<std::string>& additional_features,
++      const std::string& raw_features,
 +      const scoped_refptr<network::ResourceRequestBody>& body,
        bool user_gesture,
        bool opener_suppressed,
        bool* no_javascript_access);
+diff --git a/content/public/browser/web_contents_delegate.cc b/content/public/browser/web_contents_delegate.cc
+index 5aa89aef4dbf3fe4ac7ce56b99c371d188584351..72a434fa612cdb4521aab981f98883af87783a80 100644
+--- a/content/public/browser/web_contents_delegate.cc
++++ b/content/public/browser/web_contents_delegate.cc
+@@ -26,6 +26,17 @@ namespace content {
+
+ WebContentsDelegate::WebContentsDelegate() = default;
+
++void WebContentsDelegate::WebContentsCreatedWithFullParams(
++    WebContents* source_contents,
++    int opener_render_process_id,
++    int opener_render_frame_id,
++    const mojom::CreateNewWindowParams& params,
++    WebContents* new_contents) {
++  WebContentsCreated(source_contents, opener_render_process_id,
++                     opener_render_frame_id, params.frame_name,
++                     params.target_url, new_contents);
++}
++
+ WebContents* WebContentsDelegate::OpenURLFromTab(WebContents* source,
+                                                  const OpenURLParams& params) {
+   return nullptr;
+diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
+index 01db3853cb915dca4873c779f06bbf84b002abf6..4a8e4cf2386594e27e2dd8117bac78531b28830c 100644
+--- a/content/public/browser/web_contents_delegate.h
++++ b/content/public/browser/web_contents_delegate.h
+@@ -16,6 +16,7 @@
+ #include "base/strings/string16.h"
+ #include "build/build_config.h"
+ #include "content/common/content_export.h"
++#include "content/common/frame.mojom.h"
+ #include "content/public/browser/bluetooth_chooser.h"
+ #include "content/public/browser/bluetooth_scanning_prompt.h"
+ #include "content/public/browser/invalidate_type.h"
+@@ -333,6 +334,13 @@ class CONTENT_EXPORT WebContentsDelegate {
+       const std::string& partition_id,
+       SessionStorageNamespace* session_storage_namespace);
+
++  virtual void WebContentsCreatedWithFullParams(
++      WebContents* source_contents,
++      int opener_render_process_id,
++      int opener_render_frame_id,
++      const mojom::CreateNewWindowParams& params,
++      WebContents* new_contents);
++
+   // Notifies the delegate about the creation of a new WebContents. This
+   // typically happens when popups are created.
+   virtual void WebContentsCreated(WebContents* source_contents,
 diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
 index b3388258feb1d9fd791a975b08a382addd06af3a..98855151d1f07177a20b0f6079f2f48826d215ca 100644
 --- a/content/renderer/render_view_impl.cc
@@ -81,10 +146,12 @@ index b3388258feb1d9fd791a975b08a382addd06af3a..98855151d1f07177a20b0f6079f2f488
  #include "content/renderer/media/audio/audio_device_factory.h"
  #include "content/renderer/render_frame_impl.h"
  #include "content/renderer/render_frame_proxy.h"
-@@ -1255,6 +1256,8 @@ WebView* RenderViewImpl::CreateView(
+@@ -1255,6 +1256,10 @@ WebView* RenderViewImpl::CreateView(
    }
    params->features = ConvertWebWindowFeaturesToMojoWindowFeatures(features);
 
++  params->raw_features = features.raw_features.Utf8(
++      WTF::UTF8ConversionMode::kStrictUTF8ConversionReplacingUnpairedSurrogatesWithFFFD);
 +  params->body = GetRequestBodyForWebURLRequest(request);
 +
    // We preserve this information before sending the message since |params| is
@@ -98,7 +165,7 @@ index bf7c4bf0b76a89b1ecee6edc11fcfd06fe679968..79b2ba79653a251d3a4c3a54adbcd5c1
      const std::string& frame_name,
      WindowOpenDisposition disposition,
      const blink::mojom::WindowFeatures& features,
-+    const std::vector<std::string>& additional_features,
++    const std::string& raw_features,
 +    const scoped_refptr<network::ResourceRequestBody>& body,
      bool user_gesture,
      bool opener_suppressed,
@@ -111,8 +178,42 @@ index aaf3b8fed16bc2959941effaffd3aec87017ca59..1ea96df464f61c963a6d9aa224b9607e
                         const std::string& frame_name,
                         WindowOpenDisposition disposition,
                         const blink::mojom::WindowFeatures& features,
-+                       const std::vector<std::string>& additional_features,
++                       const std::string& raw_features,
 +                       const scoped_refptr<network::ResourceRequestBody>& body,
                         bool user_gesture,
                         bool opener_suppressed,
                         bool* no_javascript_access) override;
+diff --git a/third_party/blink/public/web/web_window_features.h b/third_party/blink/public/web/web_window_features.h
+index 4f735ad0d97eaac9a57dad137e479f8a7ec33a36..0a3c5821962c85609b64b3625fa6b8d658cd9ab2 100644
+--- a/third_party/blink/public/web/web_window_features.h
++++ b/third_party/blink/public/web/web_window_features.h
+@@ -31,6 +31,8 @@
+ #ifndef THIRD_PARTY_BLINK_PUBLIC_WEB_WEB_WINDOW_FEATURES_H_
+ #define THIRD_PARTY_BLINK_PUBLIC_WEB_WEB_WINDOW_FEATURES_H_
+
++#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
++
+ namespace blink {
+
+ struct WebWindowFeatures {
+@@ -60,6 +62,8 @@ struct WebWindowFeatures {
+   bool noreferrer = false;
+   bool background = false;
+   bool persistent = false;
++
++  String raw_features;
+ };
+
+ }  // namespace blink
+diff --git a/third_party/blink/renderer/core/frame/local_dom_window.cc b/third_party/blink/renderer/core/frame/local_dom_window.cc
+index 07cb6e3fabfa7a32f9923dcf4fbc8cebccdbde46..58e768bfcac2561f4427c71b6c31ba73f9be4b7b 100644
+--- a/third_party/blink/renderer/core/frame/local_dom_window.cc
++++ b/third_party/blink/renderer/core/frame/local_dom_window.cc
+@@ -1492,6 +1492,7 @@ DOMWindow* LocalDOMWindow::open(v8::Isolate* isolate,
+   }
+
+   WebWindowFeatures window_features = GetWindowFeaturesFromString(features);
++  window_features.raw_features = features;
+
+   FrameLoadRequest frame_request(active_document,
+                                  ResourceRequest(completed_url));

shell/browser/api/electron_api_app.cc

@@ -671,7 +671,7 @@ bool App::CanCreateWindow(
     const std::string& frame_name,
     WindowOpenDisposition disposition,
     const blink::mojom::WindowFeatures& features,
-    const std::vector<std::string>& additional_features,
+    const std::string& raw_features,
     const scoped_refptr<network::ResourceRequestBody>& body,
     bool user_gesture,
     bool opener_suppressed,
@@ -685,7 +685,7 @@ bool App::CanCreateWindow(
     // No need to emit any event if the WebContents is not available in JS.
     if (!api_web_contents.IsEmpty()) {
       api_web_contents->OnCreateWindow(target_url, referrer, frame_name,
-                                       disposition, additional_features, body);
+                                       disposition, raw_features, body);
     }
   }
 

shell/browser/api/electron_api_app.h

@@ -131,7 +131,7 @@ class App : public ElectronBrowserClient::Delegate,
                        const std::string& frame_name,
                        WindowOpenDisposition disposition,
                        const blink::mojom::WindowFeatures& features,
-                       const std::vector<std::string>& additional_features,
+                       const std::string& raw_features,
                        const scoped_refptr<network::ResourceRequestBody>& body,
                        bool user_gesture,
                        bool opener_suppressed,

shell/browser/api/electron_api_web_contents.cc

@@ -44,6 +44,7 @@
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/referrer_type_converters.h"
 #include "electron/buildflags/buildflags.h"
 #include "electron/shell/common/api/api.mojom.h"
 #include "gin/data_object_builder.h"
@@ -641,25 +642,25 @@ void WebContents::OnCreateWindow(
     const content::Referrer& referrer,
     const std::string& frame_name,
     WindowOpenDisposition disposition,
-    const std::vector<std::string>& features,
+    const std::string& features,
     const scoped_refptr<network::ResourceRequestBody>& body) {
-  if (type_ == Type::BROWSER_WINDOW || type_ == Type::OFF_SCREEN)
+  Emit("-new-window", target_url, frame_name, disposition, features, referrer,
-    Emit("-new-window", target_url, frame_name, disposition, features, body,
+       body);
-         referrer);
-  else
-    Emit("new-window", target_url, frame_name, disposition, features);
 }
 
-void WebContents::WebContentsCreated(content::WebContents* source_contents,
+void WebContents::WebContentsCreatedWithFullParams(
-                                     int opener_render_process_id,
+    content::WebContents* source_contents,
-                                     int opener_render_frame_id,
+    int opener_render_process_id,
-                                     const std::string& frame_name,
+    int opener_render_frame_id,
-                                     const GURL& target_url,
+    const content::mojom::CreateNewWindowParams& params,
-                                     content::WebContents* new_contents) {
+    content::WebContents* new_contents) {
   ChildWebContentsTracker::CreateForWebContents(new_contents);
   auto* tracker = ChildWebContentsTracker::FromWebContents(new_contents);
-  tracker->url = target_url;
+  tracker->url = params.target_url;
-  tracker->frame_name = frame_name;
+  tracker->frame_name = params.frame_name;
+  tracker->referrer = params.referrer.To<content::Referrer>();
+  tracker->raw_features = params.raw_features;
+  tracker->body = params.body;
 }
 
 void WebContents::AddNewContents(
@@ -678,7 +679,8 @@ void WebContents::AddNewContents(
       CreateAndTake(isolate(), std::move(new_contents), Type::BROWSER_WINDOW);
   if (Emit("-add-new-contents", api_web_contents, disposition, user_gesture,
            initial_rect.x(), initial_rect.y(), initial_rect.width(),
-           initial_rect.height(), tracker->url, tracker->frame_name)) {
+           initial_rect.height(), tracker->url, tracker->frame_name,
+           tracker->referrer, tracker->raw_features, tracker->body)) {
     // TODO(zcbenz): Can we make this sync?
     api_web_contents->DestroyWebContents(true /* async */);
   }
@@ -688,10 +690,8 @@ content::WebContents* WebContents::OpenURLFromTab(
     content::WebContents* source,
     const content::OpenURLParams& params) {
   if (params.disposition != WindowOpenDisposition::CURRENT_TAB) {
-    if (type_ == Type::BROWSER_WINDOW || type_ == Type::OFF_SCREEN)
+    Emit("-new-window", params.url, "", params.disposition, "", params.referrer,
-      Emit("-new-window", params.url, "", params.disposition);
+         params.post_data);
-    else
-      Emit("new-window", params.url, "", params.disposition);
     return nullptr;
   }
 

shell/browser/api/electron_api_web_contents.h

@@ -13,6 +13,7 @@
 #include "base/observer_list.h"
 #include "base/observer_list_types.h"
 #include "content/common/cursors/webcursor.h"
+#include "content/common/frame.mojom.h"
 #include "content/public/browser/devtools_agent_host.h"
 #include "content/public/browser/keyboard_event_processing_result.h"
 #include "content/public/browser/render_widget_host.h"
@@ -312,7 +313,7 @@ class WebContents : public gin_helper::TrackableObject<WebContents>,
                       const content::Referrer& referrer,
                       const std::string& frame_name,
                       WindowOpenDisposition disposition,
-                      const std::vector<std::string>& features,
+                      const std::string& features,
                       const scoped_refptr<network::ResourceRequestBody>& body);
 
   // Returns the preload script path of current WebContents.
@@ -383,12 +384,12 @@ class WebContents : public gin_helper::TrackableObject<WebContents>,
                               const base::string16& message,
                               int32_t line_no,
                               const base::string16& source_id) override;
-  void WebContentsCreated(content::WebContents* source_contents,
+  void WebContentsCreatedWithFullParams(
-                          int opener_render_process_id,
+      content::WebContents* source_contents,
-                          int opener_render_frame_id,
+      int opener_render_process_id,
-                          const std::string& frame_name,
+      int opener_render_frame_id,
-                          const GURL& target_url,
+      const content::mojom::CreateNewWindowParams& params,
-                          content::WebContents* new_contents) override;
+      content::WebContents* new_contents) override;
   void AddNewContents(content::WebContents* source,
                       std::unique_ptr<content::WebContents> new_contents,
                       WindowOpenDisposition disposition,

shell/browser/child_web_contents_tracker.cc

@@ -9,6 +9,8 @@ namespace electron {
 ChildWebContentsTracker::ChildWebContentsTracker(
     content::WebContents* web_contents) {}
 
+ChildWebContentsTracker::~ChildWebContentsTracker() {}
+
 WEB_CONTENTS_USER_DATA_KEY_IMPL(ChildWebContentsTracker)
 
 }  // namespace electron

shell/browser/child_web_contents_tracker.h

@@ -15,8 +15,13 @@ namespace electron {
 // created by native `window.open()`
 struct ChildWebContentsTracker
     : public content::WebContentsUserData<ChildWebContentsTracker> {
+  ~ChildWebContentsTracker() override;
+
   GURL url;
   std::string frame_name;
+  content::Referrer referrer;
+  std::string raw_features;
+  scoped_refptr<network::ResourceRequestBody> body;
 
  private:
   explicit ChildWebContentsTracker(content::WebContents* web_contents);

shell/browser/electron_browser_client.cc

@@ -762,7 +762,7 @@ bool ElectronBrowserClient::CanCreateWindow(
     const std::string& frame_name,
     WindowOpenDisposition disposition,
     const blink::mojom::WindowFeatures& features,
-    const std::vector<std::string>& additional_features,
+    const std::string& raw_features,
     const scoped_refptr<network::ResourceRequestBody>& body,
     bool user_gesture,
     bool opener_suppressed,
@@ -786,7 +786,7 @@ bool ElectronBrowserClient::CanCreateWindow(
     return delegate_->CanCreateWindow(
         opener, opener_url, opener_top_level_frame_url, source_origin,
         container_type, target_url, referrer, frame_name, disposition, features,
-        additional_features, body, user_gesture, opener_suppressed,
+        raw_features, body, user_gesture, opener_suppressed,
         no_javascript_access);
   }
 

shell/browser/electron_browser_client.h

@@ -128,7 +128,7 @@ class ElectronBrowserClient : public content::ContentBrowserClient,
                        const std::string& frame_name,
                        WindowOpenDisposition disposition,
                        const blink::mojom::WindowFeatures& features,
-                       const std::vector<std::string>& additional_features,
+                       const std::string& raw_features,
                        const scoped_refptr<network::ResourceRequestBody>& body,
                        bool user_gesture,
                        bool opener_suppressed,

spec-main/internal-spec.ts

@@ -2,7 +2,7 @@ import { expect } from 'chai';
 
 describe('feature-string parsing', () => {
   it('is indifferent to whitespace around keys and values', () => {
-    const parseFeaturesString = require('../lib/common/parse-features-string');
+    const { parseFeaturesString } = require('../lib/common/parse-features-string');
     const checkParse = (string: string, parsed: Record<string, string | boolean>) => {
       const features: Record<string, string | boolean> = {};
       parseFeaturesString(string, (k: string, v: any) => { features[k] = v; });