diff --git a/core/modules/toolbar/css/toolbar.module.css b/core/modules/toolbar/css/toolbar.module.css
index 69eb7c2..ba67b89 100644
--- a/core/modules/toolbar/css/toolbar.module.css
+++ b/core/modules/toolbar/css/toolbar.module.css
@@ -14,6 +14,7 @@
   line-height: 1;
   margin: 0;
   padding: 0;
+  position: static;
   vertical-align: baseline;
 }
 @media print {
@@ -60,11 +61,11 @@
  * is active. The toolbar container, that contains the bar and the trays, is
  * position absolutely so that it scrolls with the page. Otherwise, on smaller
  * screens, the components of the admin toolbar are positioned statically. */
-body.toolbar-fixed .toolbar-oriented,
+.toolbar-oriented,
 .toolbar-oriented .toolbar-bar,
 .toolbar-oriented .toolbar-tray {
   left: 0;
-  position: absolute;
+  position: fixed;
   right: 0;
   top: 0;
 }
@@ -72,15 +73,10 @@ body.toolbar-fixed .toolbar-oriented,
 .toolbar-oriented .toolbar-bar {
   z-index: 502;
 }
-/* Position the admin toolbar fixed when the configured standard breakpoint is
- * active. */
-body.toolbar-fixed .toolbar-oriented .toolbar-bar {
-  position: fixed;
-}
 /* When the configured narrow breakpoint is active, the toolbar is sized to wrap
  * around the trays in order to provide a context for scrolling tray content
  * that is taller than the viewport. */
-body.toolbar-tray-open.toolbar-fixed.toolbar-vertical .toolbar-oriented {
+body.toolbar-tray-open.toolbar-vertical .toolbar-oriented {
   bottom: 0;
   width: 240px;
   width: 15rem;
@@ -182,14 +178,14 @@ body.toolbar-tray-open.toolbar-fixed.toolbar-vertical .toolbar-oriented {
 /* When the configured standard breakpoint is active and the tray is in a
  * horizontal position, the tray is fixed to the top of the viewport and does
  * not scroll with the page contents. */
-body.toolbar-fixed .toolbar .toolbar-tray-horizontal {
+.toolbar .toolbar-tray-horizontal {
   position: fixed;
 }
 /* When the configured standard breakpoint is active and the tray is in a
  * vertical position, the tray does not scroll with the page. The contents of
  * the tray scroll within the confines of the viewport. */
 .toolbar .toolbar-tray-vertical.is-active,
-body.toolbar-fixed .toolbar .toolbar-tray-vertical {
+.toolbar .toolbar-tray-vertical {
   height: 100%;
   overflow-x: hidden;
   overflow-y: auto;
@@ -208,23 +204,23 @@ body.toolbar-fixed .toolbar .toolbar-tray-vertical {
 }
 /* When the configured standard breakpoint is active, the tray appears to push
  * the page content away from the edge of the viewport. */
-body.toolbar-tray-open.toolbar-vertical.toolbar-fixed {
+body.toolbar-tray-open.toolbar-vertical {
   margin-left: 240px; /* LTR */
   margin-left: 15rem; /* LTR */
 }
 @media print {
-  body.toolbar-tray-open.toolbar-vertical.toolbar-fixed {
+  body.toolbar-tray-open.toolbar-vertical {
     margin-left: 0;
   }
 }
-[dir="rtl"] body.toolbar-tray-open.toolbar-vertical.toolbar-fixed {
+[dir="rtl"] body.toolbar-tray-open.toolbar-vertical {
   margin-left: auto;
   margin-left: auto;
   margin-right: 240px;
   margin-right: 15rem;
 }
 @media print {
-  [dir="rtl"] body.toolbar-tray-open.toolbar-vertical.toolbar-fixed {
+  [dir="rtl"] body.toolbar-tray-open.toolbar-vertical {
     margin-right: 0;
   }
 }
diff --git a/core/modules/toolbar/js/models/ToolbarModel.js b/core/modules/toolbar/js/models/ToolbarModel.js
index 357692c..0b6ec48 100644
--- a/core/modules/toolbar/js/models/ToolbarModel.js
+++ b/core/modules/toolbar/js/models/ToolbarModel.js
@@ -22,9 +22,7 @@
      * @prop activeTab
      * @prop activeTray
      * @prop isOriented
-     * @prop isFixed
      * @prop areSubtreesLoaded
-     * @prop isViewportOverflowConstrained
      * @prop orientation
      * @prop locked
      * @prop isTrayToggleVisible
@@ -59,14 +57,6 @@
       isOriented: false,
 
       /**
-       * Indicates whether the toolbar is positioned absolute (false) or fixed
-       * (true).
-       *
-       * @type {bool}
-       */
-      isFixed: false,
-
-      /**
        * Menu subtrees are loaded through an AJAX request only when the Toolbar
        * is set to a vertical orientation.
        *
@@ -75,15 +65,6 @@
       areSubtreesLoaded: false,
 
       /**
-       * If the viewport overflow becomes constrained, isFixed must be true so
-       * that elements in the trays aren't lost off-screen and impossible to
-       * get to.
-       *
-       * @type {bool}
-       */
-      isViewportOverflowConstrained: false,
-
-      /**
        * The orientation of the active tray.
        *
        * @type {string}
diff --git a/core/modules/toolbar/js/views/BodyVisualView.js b/core/modules/toolbar/js/views/BodyVisualView.js
index 7499646..a0466ea 100644
--- a/core/modules/toolbar/js/views/BodyVisualView.js
+++ b/core/modules/toolbar/js/views/BodyVisualView.js
@@ -17,7 +17,7 @@
      * @augments Backbone.View
      */
     initialize: function () {
-      this.listenTo(this.model, 'change:orientation change:offsets change:activeTray change:isOriented change:isFixed change:isViewportOverflowConstrained', this.render);
+      this.listenTo(this.model, 'change:orientation change:offsets change:activeTray change:isOriented change:isFixed', this.render);
     },
 
     /**
@@ -27,7 +27,6 @@
       var $body = $('body');
       var orientation = this.model.get('orientation');
       var isOriented = this.model.get('isOriented');
-      var isViewportOverflowConstrained = this.model.get('isViewportOverflowConstrained');
 
       $body
         // We are using JavaScript to control media-query handling for two
@@ -38,8 +37,6 @@
         // then the CSS becomes simpler and more robust.
         .toggleClass('toolbar-vertical', (orientation === 'vertical'))
         .toggleClass('toolbar-horizontal', (isOriented && orientation === 'horizontal'))
-        // When the toolbar is fixed, it will not scroll with page scrolling.
-        .toggleClass('toolbar-fixed', (isViewportOverflowConstrained || this.model.get('isFixed')))
         // Toggle the toolbar-tray-open class on the body element. The class is
         // applied when a toolbar tray is active. Padding might be applied to
         // the body element to prevent the tray from overlapping content.