diff --git a/files/en-us/web/api/barprop/visible/index.md b/files/en-us/web/api/barprop/visible/index.md
index 80d285995d106a7..a074f3117f59316 100644
--- a/files/en-us/web/api/barprop/visible/index.md
+++ b/files/en-us/web/api/barprop/visible/index.md
@@ -21,11 +21,16 @@ let visible = BarProp.visible;
 
 ### Value
 
-A {{jsxref("Boolean")}}, which is true if the bar represented by the used interface element is visible.
+A {{jsxref("Boolean")}}, which is true if the top-level window is opened by
+{{domxref("window.open")}} with {{domxref("window.open", "requesting a popup window", "#popup_feature", 1)}}.
+
+> **Note:** Historically this represented whether the used interface element is visible
+> or not. For privacy reasons, this no more represent the actual visibility of each
+> interface element.
 
 ## Examples
 
-The following example prints `true` to the console if the location bar is visible, `false` if it is not.
+The following example prints `true` to the console if the window is not a popup.
 
 ```js
 console.log(window.locationbar.visible);
diff --git a/files/en-us/web/api/window/open/index.md b/files/en-us/web/api/window/open/index.md
index 3aac07461b3d17c..b2bea1efbcdf751 100644
--- a/files/en-us/web/api/window/open/index.md
+++ b/files/en-us/web/api/window/open/index.md
@@ -50,11 +50,10 @@ var window = window.open(url, windowName, [windowFeatures]);
 
 - `windowFeatures` {{optional_inline}}
   - : A {{domxref("DOMString")}} containing a comma-separated list of window features
-    given with their corresponding values in the form "name=value". These features include
-    options such as the window's default size and position, whether or not to include
-    toolbar, and so forth. There must be no whitespace in the string. See
-    {{anch("Window features")}} below for documentation of each of the features that can
-    be specified.
+    given with their corresponding values in the form "name=value", or "name" for boolean feature. These
+    features include options such as the window's default size and position, whether or
+    not to open a minimal-popup window, and so forth. See {{anch("Window features")}}
+    below for documentation of each of the features that can be specified.
 
 ### Return value
 
@@ -82,7 +81,7 @@ creation and the loading of the referenced resource are done asynchronously.
 
 ```js
 var windowObjectReference;
-var windowFeatures = "menubar=yes,location=yes,resizable=yes,scrollbars=yes,status=yes";
+var windowFeatures = "popup";
 
 function openRequestedPopup() {
   windowObjectReference = window.open("http://www.cnn.com/", "CNN_WindowName", windowFeatures);
@@ -96,7 +95,7 @@ function openRequestedPopup() {
   windowObjectReference = window.open(
     "http://www.domainname.ext/path/ImageFile.png",
     "DescriptiveWindowName",
-    "resizable,scrollbars,status"
+    "left=100,top=100,width=320,heigth=320"
   );
 }
 ```
@@ -121,15 +120,36 @@ parameter is not provided (or if the `windowFeatures` parameter is
 an empty string), then the new secondary window will render the default toolbars of the
 main window.
 
-> **Note:** In some browsers, users can override the
-> `windowFeatures` settings and enable (or prevent the disabling
-> of) features. Further, control of some window features is available only on some browsers
-> and platforms (See [popup condition](#popup_condition) section)
+### Popup feature
+
+`windowFeatures` can be used to explicitly request the browser to use a popup window,
+that has minimal UI parts, for the new secondary window.
+
+Whether or not to use a popup window affects {{domxref("BarProp.visible")}} value.
+
+> **Note:** In some browsers, users can configure not to use a popup window.  Also, some
+> browsers, such as mobile browsers, don't have the concept of windows.
+
+The feature can be set to `yes` or `1`, or just be present to be on. Set them to
+`no` or `0`, or in most cases just omit them, to be off.
+
+Example: `popup=yes`, `popup=1`, and `popup` have identical results.
+
+- `popup`
+
+  - : If this feature is present and on, it requests the browser to use a minimal pop-up
+      window for the new secondary window.
+      If this feature is present and off, it requests the browser not to use minimal
+      pop-up window for the secondary window.
 
 ### Position and size features
 
-`windowFeatures` parameter can specify the position and size of
-the new window.
+`windowFeatures` parameter can specify the position and size of the new secondary window.
+If any of them are given, and the `popup` feature is not given, it requests the browser
+to use a minimal pop-up window for the secondary window.
+
+> **Note:** In some browsers, users can override the behavior. Also this has no effect on
+> the mobile browsers without the concept of windows.
 
 [Note on position and
 dimension error correction](#note_on_position_and_dimension_error_correction)
@@ -178,31 +198,15 @@ If the `windowFeatures` parameter is non-empty and no size
 features are defined, then the new window dimensions will be the same as the dimensions
 of the most recently rendered window.
 
-### Browser-dependent size features
-
-> **Warning:** Do not use them.
-
-- `outerWidth` {{deprecated_inline}} (only on Firefox, obsolete from Firefox 80)
-  - : Specifies the width of the whole browser window in pixels. This
-    `outerWidth` value includes the window vertical scrollbar (if present) and
-    left and right window resizing borders.
-- `outerHeight` {{deprecated_inline}} (only on Firefox, obsolete from Firefox 80)
-  - : Specifies the height of the whole browser window in pixels. This
-    `outerHeight` value includes any/all present toolbar, window horizontal
-    scrollbar (if present) and top and bottom window resizing borders. Minimal required
-    value is 100.
-
 ### Toolbar and UI parts features
 
-> **Warning:** In modern browsers (Firefox 76 or newer, Google Chrome, Safari, Chromium Edge), the
+> **Warning:** These features are kept only for backward compatibility.
+> In modern browsers (Firefox 76 or newer, Google Chrome, Safari, Chromium Edge), the
 > following features are just a condition for whether to open popup or not. See [popup condition](#popup_condition) section.
 
-The following features control the visibility of each UI parts, All features can be set
-to `yes` or `1`, or just be present to be on. Set them to
-`no` or `0`, or in most cases just omit them, to be off.
-
-Example: `status=yes`, `status=1`, and `status` have
-identical results.
+The following features control the visibility of each UI parts, these features can also
+be set to `yes` or `1`, or just be present to be on. Set them to `no` or `0`, or in most
+cases just omit them, to be off.
 
 - `menubar`
 
@@ -305,7 +309,7 @@ function openFFPromotionPopup() {
 
   {
     windowObjectReference = window.open("http://www.spreadfirefox.com/",
-   "PromoteFirefoxWindowName", "resizable,scrollbars,status");
+   "PromoteFirefoxWindowName", "popup");
     /* then create it. The new window will be created and
        will be brought on top of any other window. */
   }
@@ -357,8 +361,7 @@ var windowObjectReference = null; // global variable
 
 function openRequestedPopup(url, windowName) {
   if(windowObjectReference == null || windowObjectReference.closed) {
-    windowObjectReference = window.open(url, windowName,
-           "resizable,scrollbars,status");
+    windowObjectReference = window.open(url, windowName, "popup");
   } else {
     windowObjectReference.focus();
   };
@@ -387,10 +390,10 @@ var PreviousUrl; /* global variable that will store the
 function openRequestedSinglePopup(url) {
   if(windowObjectReference == null || windowObjectReference.closed) {
     windowObjectReference = window.open(url, "SingleSecondaryWindowName",
-         "resizable,scrollbars,status");
+         "popup");
   } else if(PreviousUrl != url) {
     windowObjectReference = window.open(url, "SingleSecondaryWindowName",
-      "resizable=yes,scrollbars=yes,status=yes");
+      "popup");
     /* if the resource to load is different,
        then we load it in the already opened secondary window and then
        we bring such window back on top/in front of its parent window. */
@@ -671,7 +674,7 @@ UI-related items of `windowFeatures` are used as a condition to
 whether opening a popup or a new tab, or a new window, and UI parts visibility of each
 of them is fixed.
 
-The condition is implementation-dependent and not guaranteed to be stable.
+The detailed condition is described in ["To check if a popup window is requested"](https://html.spec.whatwg.org/#popup-window-is-requested) section in the spec.
 
 ### Note on scrollbars
 
diff --git a/files/en-us/web/api/window/open/obsolete_features/index.md b/files/en-us/web/api/window/open/obsolete_features/index.md
index 989e5b94154ee83..b408d4487a78850 100644
--- a/files/en-us/web/api/window/open/obsolete_features/index.md
+++ b/files/en-us/web/api/window/open/obsolete_features/index.md
@@ -13,3 +13,13 @@ This page lists the obsolete `windowFeatures` parameter of [window.open](/en-US/
 - `personalbar` {{deprecated_inline}}
   - : If this feature is on, then the new secondary window renders the Personal Toolbar in Netscape 6.x, Netscape 7.x and Mozilla browser. It renders the Bookmarks Toolbar in Firefox. In addition to the Personal Toolbar, Mozilla browser will render the Site Navigation Bar if such toolbar is visible, present in the parent window.
     Mozilla and Firefox users can force new windows to always render the Personal Toolbar/Bookmarks toolbar by setting `dom.disable_window_open_feature.personalbar` to _true_ in [about:config](http://support.mozilla.com/en-US/kb/Editing+configuration+files#about_config) or in their [user.js file](http://support.mozilla.com/en-US/kb/Editing+configuration+files#user_js).
+- `outerWidth` {{deprecated_inline}} (only on Firefox, obsolete from Firefox 80)
+  - : Specifies the width of the whole browser window in pixels. This
+    `outerWidth` value includes the window vertical scrollbar (if present) and
+    left and right window resizing borders.
+- `outerHeight` {{deprecated_inline}} (only on Firefox, obsolete from Firefox 80)
+  - : Specifies the height of the whole browser window in pixels. This
+    `outerHeight` value includes any/all present toolbar, window horizontal
+    scrollbar (if present) and top and bottom window resizing borders. Minimal required
+    value is 100.
+