diff --git a/build/style-compiler/LessRegistry.cs b/build/style-compiler/LessRegistry.cs
index 88f3348d1f22..0adfdb24a903 100644
--- a/build/style-compiler/LessRegistry.cs
+++ b/build/style-compiler/LessRegistry.cs
@@ -207,7 +207,6 @@ static string[] GenerateWidgetsLessFileList(string themeName)
                 "timeView",
                 "scheduler",
                 "form",
-                "spa",
                 "filterBuilder",
                 "recurrenceEditor",
                 "drawer",
diff --git a/styles/widgets/android5/color-schemes/light/android5.light.less b/styles/widgets/android5/color-schemes/light/android5.light.less
index 507b8f649929..6d698c26d691 100644
--- a/styles/widgets/android5/color-schemes/light/android5.light.less
+++ b/styles/widgets/android5/color-schemes/light/android5.light.less
@@ -1082,17 +1082,6 @@
 @ANDROID5_COLORBOX_NOCOLOR_IMG: url(images/widgets/android5/color-schemes/light/colorbox/nocolor.png);
 @ANDROID5_ATTENTION_IMAGE: url(images/widgets/android5/color-schemes/light/attention.png);
 
-// SPA
-
-// Master-detail
-
-/**
-* @name 10. Splitter color
-* @type color
-* @group layouts.split
-*/
-@ANDROID5_SPLIT_LAYOUT_MASTER_PANE_SPLITTER_COLOR: #808080;
-
 // FilterBuilder
 @filterbuilder-bg: @ANDROID5_TYPOGRAPHY_BACKGROUND;
 
diff --git a/styles/widgets/android5/spa.android5.less b/styles/widgets/android5/spa.android5.less
deleted file mode 100644
index c33226f44333..000000000000
--- a/styles/widgets/android5/spa.android5.less
+++ /dev/null
@@ -1,3 +0,0 @@
-.dx-splitter {
-    border-right-color: @ANDROID5_SPLIT_LAYOUT_MASTER_PANE_SPLITTER_COLOR;
-}
diff --git a/styles/widgets/common/spa.less b/styles/widgets/common/spa.less
deleted file mode 100644
index 8b137891791f..000000000000
--- a/styles/widgets/common/spa.less
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/styles/widgets/generic/color-schemes/carmine/generic.carmine.less b/styles/widgets/generic/color-schemes/carmine/generic.carmine.less
index ca32f8f4d2cb..3aee11389d6c 100644
--- a/styles/widgets/generic/color-schemes/carmine/generic.carmine.less
+++ b/styles/widgets/generic/color-schemes/carmine/generic.carmine.less
@@ -2123,50 +2123,6 @@
 
 @calendar-cell-empty-bg: url(images/widgets/generic/color-schemes/light/calendar/empty-cell.png) center center no-repeat;
 
-// SPA
-
-// Desktop
-
-@desktop-layout-main-menu-bg: @base-accent;
-
-/**
-* @name 10. Toolbar major color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-color: lighten(@base-text-color, 73.8%);
-@desktop-layout-menu-selected-bg: @tabs-tab-bg;
-
-/**
-* @name 10. Toolbar item hover background color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-hover-bg: lighten(@desktop-layout-main-menu-bg, 15%);
-
- /**
- * @name 10. Toolbar border color
- * @type color
- * @group layouts.desktop
- */
-@desktop-layout-toolbar-border-color: @base-border-color;
-
-/**
-* @name 10. Copyright text color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-copyright-color: #d0d4d6;
-
-// Master-detail
-
-/**
-* @name 10. Splitter color
-* @type color
-* @group layouts.split
-*/
-@desktop-splitlayout-border-color: @desktop-layout-toolbar-border-color;
-
 // Fieldset
 
 @fieldset-field-label-color: @base-label-color;
diff --git a/styles/widgets/generic/color-schemes/contrast/generic.contrast.less b/styles/widgets/generic/color-schemes/contrast/generic.contrast.less
index c1674a8c347c..65ca9baeec69 100644
--- a/styles/widgets/generic/color-schemes/contrast/generic.contrast.less
+++ b/styles/widgets/generic/color-schemes/contrast/generic.contrast.less
@@ -1645,22 +1645,6 @@
 @colorbox-preview-empty-bg: url(images/widgets/generic/color-schemes/contrast/colorbox/nocolor.png);
 @calendar-cell-empty-bg: url(images/widgets/generic/color-schemes/contrast/calendar/empty-cell.png) center center no-repeat;
 
-// SPA
-// Desktop
-
-@desktop-layout-main-menu-bg: @base-inverted-bg;
-
-@desktop-layout-menu-color: @base-text-color;
-@desktop-layout-menu-selected-bg: @base-inverted-bg;
-
-@desktop-layout-toolbar-border-color: @base-border-color;
-@desktop-layout-menu-hover-bg: @base-accent;
-@desktop-layout-copyright-color: @base-text-color;
-
-// Master-detail
-
-@desktop-splitlayout-border-color: @base-border-color;
-
 // Fieldset
 
 @fieldset-field-label-color: @base-label-color;
diff --git a/styles/widgets/generic/color-schemes/dark/generic.dark.less b/styles/widgets/generic/color-schemes/dark/generic.dark.less
index c8c8fd00a483..a75641c37218 100644
--- a/styles/widgets/generic/color-schemes/dark/generic.dark.less
+++ b/styles/widgets/generic/color-schemes/dark/generic.dark.less
@@ -2124,49 +2124,6 @@
 
 @calendar-cell-empty-bg: url(images/widgets/generic/color-schemes/dark/calendar/empty-cell.png) center center no-repeat;
 
-// SPA
-
-// Desktop
-
-@desktop-layout-main-menu-bg: @base-accent;
-/**
-* @name 10. Toolbar major color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-color: darken(@base-text-color, 73.8%);
-@desktop-layout-menu-selected-bg: lighten(@base-bg, 6.3%);
-
-/**
-* @name 10. Toolbar item hover background color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-hover-bg: darken(@desktop-layout-main-menu-bg, 10%);
-
-/**
- * @name 10. Toolbar border color
- * @type color
- * @group layouts.desktop
- */
-@desktop-layout-toolbar-border-color: lighten(@base-border-color, 2.7%);
-
-/**
-* @name 10. Copyright text color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-copyright-color: darken(@base-text-color, 30.5%);
-
-// Master-detail
-
-/**
-* @name 10. Splitter color
-* @type color
-* @group layouts.split
-*/
-@desktop-splitlayout-border-color: @desktop-layout-toolbar-border-color;
-
 // Fieldset
 
 @fieldset-field-label-color: @base-label-color;
diff --git a/styles/widgets/generic/color-schemes/darkmoon/generic.darkmoon.less b/styles/widgets/generic/color-schemes/darkmoon/generic.darkmoon.less
index c5252c94af2f..add9a19eb2ee 100644
--- a/styles/widgets/generic/color-schemes/darkmoon/generic.darkmoon.less
+++ b/styles/widgets/generic/color-schemes/darkmoon/generic.darkmoon.less
@@ -2128,49 +2128,6 @@
 
 @calendar-cell-empty-bg: url(images/widgets/generic/color-schemes/dark/calendar/empty-cell.png) center center no-repeat;
 
-// SPA
-
-// Desktop
-
-@desktop-layout-main-menu-bg: @base-accent;
-/**
-* @name 10. Toolbar major color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-color: darken(@base-text-color, 73.8%);
-@desktop-layout-menu-selected-bg: lighten(@base-bg, 6.3%);
-
-/**
-* @name 10. Toolbar item hover background color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-hover-bg: darken(@desktop-layout-main-menu-bg, 10%);
-
-/**
- * @name 10. Toolbar border color
- * @type color
- * @group layouts.desktop
- */
-@desktop-layout-toolbar-border-color: lighten(@base-border-color, 2.7%);
-
-/**
-* @name 10. Copyright text color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-copyright-color: darken(@base-text-color, 30.5%);
-
-// Master-detail
-
-/**
-* @name 10. Splitter color
-* @type color
-* @group layouts.split
-*/
-@desktop-splitlayout-border-color: @desktop-layout-toolbar-border-color;
-
 // Fieldset
 
 @fieldset-field-label-color: @base-label-color;
diff --git a/styles/widgets/generic/color-schemes/darkviolet/generic.darkviolet.less b/styles/widgets/generic/color-schemes/darkviolet/generic.darkviolet.less
index 1a628749709e..bf93e737627b 100644
--- a/styles/widgets/generic/color-schemes/darkviolet/generic.darkviolet.less
+++ b/styles/widgets/generic/color-schemes/darkviolet/generic.darkviolet.less
@@ -2133,49 +2133,6 @@
 
 @calendar-cell-empty-bg: url(images/widgets/generic/color-schemes/dark/calendar/empty-cell.png) center center no-repeat;
 
-// SPA
-
-// Desktop
-
-@desktop-layout-main-menu-bg: @base-accent;
-/**
-* @name 10. Toolbar major color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-color: darken(@base-text-color, 73.8%);
-@desktop-layout-menu-selected-bg: lighten(@base-bg, 6.3%);
-
-/**
-* @name 10. Toolbar item hover background color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-hover-bg: darken(@desktop-layout-main-menu-bg, 10%);
-
-/**
- * @name 10. Toolbar border color
- * @type color
- * @group layouts.desktop
- */
-@desktop-layout-toolbar-border-color: lighten(@base-border-color, 2.7%);
-
-/**
-* @name 10. Copyright text color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-copyright-color: darken(@base-text-color, 30.5%);
-
-// Master-detail
-
-/**
-* @name 10. Splitter color
-* @type color
-* @group layouts.split
-*/
-@desktop-splitlayout-border-color: @desktop-layout-toolbar-border-color;
-
 // Fieldset
 
 @fieldset-field-label-color: @base-label-color;
diff --git a/styles/widgets/generic/color-schemes/greenmist/generic.greenmist.less b/styles/widgets/generic/color-schemes/greenmist/generic.greenmist.less
index d671dfc1f077..25e5caa690a3 100644
--- a/styles/widgets/generic/color-schemes/greenmist/generic.greenmist.less
+++ b/styles/widgets/generic/color-schemes/greenmist/generic.greenmist.less
@@ -2122,50 +2122,6 @@
 
 @calendar-cell-empty-bg: url(images/widgets/generic/color-schemes/light/calendar/empty-cell.png) center center no-repeat;
 
-// SPA
-
-// Desktop
-
-@desktop-layout-main-menu-bg: @base-accent;
-
-/**
-* @name 10. Toolbar major color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-color: lighten(@base-text-color, 73.8%);
-@desktop-layout-menu-selected-bg: @tabs-tab-bg;
-
-/**
-* @name 10. Toolbar item hover background color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-hover-bg: lighten(@desktop-layout-main-menu-bg, 15%);
-
- /**
- * @name 10. Toolbar border color
- * @type color
- * @group layouts.desktop
- */
-@desktop-layout-toolbar-border-color: @base-border-color;
-
-/**
-* @name 10. Copyright text color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-copyright-color: lighten(@base-text-color, 30.5%);
-
-// Master-detail
-
-/**
-* @name 10. Splitter color
-* @type color
-* @group layouts.split
-*/
-@desktop-splitlayout-border-color: @desktop-layout-toolbar-border-color;
-
 // Fieldset
 
 @fieldset-field-label-color: @base-label-color;
diff --git a/styles/widgets/generic/color-schemes/light/generic.light.less b/styles/widgets/generic/color-schemes/light/generic.light.less
index 23af9685b583..5ab21fea27ba 100644
--- a/styles/widgets/generic/color-schemes/light/generic.light.less
+++ b/styles/widgets/generic/color-schemes/light/generic.light.less
@@ -2122,50 +2122,6 @@
 
 @calendar-cell-empty-bg: url(images/widgets/generic/color-schemes/light/calendar/empty-cell.png) center center no-repeat;
 
-// SPA
-
-// Desktop
-
-@desktop-layout-main-menu-bg: @base-accent;
-
-/**
-* @name 10. Toolbar major color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-color: lighten(@base-text-color, 73.8%);
-@desktop-layout-menu-selected-bg: @tabs-tab-bg;
-
-/**
-* @name 10. Toolbar item hover background color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-hover-bg: lighten(@desktop-layout-main-menu-bg, 15%);
-
- /**
- * @name 10. Toolbar border color
- * @type color
- * @group layouts.desktop
- */
-@desktop-layout-toolbar-border-color: @base-border-color;
-
-/**
-* @name 10. Copyright text color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-copyright-color: lighten(@base-text-color, 30.5%);
-
-// Master-detail
-
-/**
-* @name 10. Splitter color
-* @type color
-* @group layouts.split
-*/
-@desktop-splitlayout-border-color: @desktop-layout-toolbar-border-color;
-
 // Fieldset
 
 @fieldset-field-label-color: @base-label-color;
diff --git a/styles/widgets/generic/color-schemes/softblue/generic.softblue.less b/styles/widgets/generic/color-schemes/softblue/generic.softblue.less
index d7b220e76ade..a56df46d2711 100644
--- a/styles/widgets/generic/color-schemes/softblue/generic.softblue.less
+++ b/styles/widgets/generic/color-schemes/softblue/generic.softblue.less
@@ -2125,50 +2125,6 @@
 
 @calendar-cell-empty-bg: url(images/widgets/generic/color-schemes/light/calendar/empty-cell.png) center center no-repeat;
 
-// SPA
-
-// Desktop
-
-@desktop-layout-main-menu-bg: @base-accent;
-
-/**
-* @name 10. Toolbar major color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-color: lighten(@base-text-color, 73.8%);
-@desktop-layout-menu-selected-bg: @tabs-tab-bg;
-
-/**
-* @name 10. Toolbar item hover background color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-hover-bg: lighten(@desktop-layout-main-menu-bg, 15%);
-
- /**
- * @name 10. Toolbar border color
- * @type color
- * @group layouts.desktop
- */
-@desktop-layout-toolbar-border-color: @base-border-color;
-
-/**
-* @name 10. Copyright text color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-copyright-color: lighten(@base-text-color, 30.5%);
-
-// Master-detail
-
-/**
-* @name 10. Splitter color
-* @type color
-* @group layouts.split
-*/
-@desktop-splitlayout-border-color: @desktop-layout-toolbar-border-color;
-
 // Fieldset
 
 @fieldset-field-label-color: @base-label-color;
diff --git a/styles/widgets/generic/spa.generic.less b/styles/widgets/generic/spa.generic.less
deleted file mode 100644
index 41a62b72f3b2..000000000000
--- a/styles/widgets/generic/spa.generic.less
+++ /dev/null
@@ -1,50 +0,0 @@
-// Desktop layout
-.dx-desktop-layout-main-menu {
-    background: @desktop-layout-main-menu-bg;
-
-    .dx-nav-item {
-        background: @desktop-layout-main-menu-bg;
-        &.dx-tab-selected {
-            background: @desktop-layout-menu-selected-bg;
-            border-top: 1px solid @desktop-layout-toolbar-border-color;
-
-            .dx-tab-text {
-                color: @tabs-tab-selected-color;
-            }
-
-            &.dx-state-hover {
-                background: @desktop-layout-menu-selected-bg;
-
-                .dx-tab-text {
-                    color: @tabs-tab-selected-color;
-                }
-            }
-        }
-
-        &.dx-state-hover {
-            background: @desktop-layout-menu-hover-bg;
-
-            .dx-tab-text {
-                color: @desktop-layout-menu-color;
-            }
-        }
-
-        .dx-tab-text {
-            color: @desktop-layout-menu-color;
-        }
-    }
-}
-
-.dx-desktop-layout-copyright {
-    color: @desktop-layout-copyright-color;
-}
-
-.dx-desktop-layout-toolbar {
-    background: @desktop-layout-menu-selected-bg;
-    border-bottom-color: @desktop-layout-toolbar-border-color;
-}
-
-// Master-detail layout
-.dx-splitter {
-    border-right-color: @desktop-splitlayout-border-color;
-}
diff --git a/styles/widgets/ios7/color-schemes/default/ios7.default.less b/styles/widgets/ios7/color-schemes/default/ios7.default.less
index 5121bcb8d5c9..2d5738fb3144 100644
--- a/styles/widgets/ios7/color-schemes/default/ios7.default.less
+++ b/styles/widgets/ios7/color-schemes/default/ios7.default.less
@@ -1175,12 +1175,6 @@
 
 // Master-detail
 
-/**
-* @name 10. Splitter color
-* @type color
-* @group layouts.split
-*/
-@IOS7_SPLIT_LAYOUT_MASTER_PANE_SPLITTER_COLOR: #c8c8c8;
 @datagrid-master-detail-cell-background-color: #FAFAFA;
 
 // FilterBuilder
diff --git a/styles/widgets/ios7/spa.ios7.less b/styles/widgets/ios7/spa.ios7.less
deleted file mode 100644
index d10411be1f3f..000000000000
--- a/styles/widgets/ios7/spa.ios7.less
+++ /dev/null
@@ -1,3 +0,0 @@
-.dx-splitter {
-    border-right-color: @IOS7_SPLIT_LAYOUT_MASTER_PANE_SPLITTER_COLOR;
-}
diff --git a/styles/widgets/material/color-schemes/material.dark.less b/styles/widgets/material/color-schemes/material.dark.less
index f501ef2e8fb1..30c4537044f8 100644
--- a/styles/widgets/material/color-schemes/material.dark.less
+++ b/styles/widgets/material/color-schemes/material.dark.less
@@ -2002,51 +2002,6 @@
 @colorbox-preview-empty-bg: url(images/widgets/material/color-schemes/dark/colorbox/nocolor.png);
 @loadindicator-background-image: url(images/widgets/material/color-schemes/dark/loader64.gif);
 
-
-// SPA
-
-// Desktop
-
-@desktop-layout-main-menu-bg: @base-accent;
-
-/**
-* @name 10. Toolbar major color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-color: lighten(@base-text-color, 73.8%);
-@desktop-layout-menu-selected-bg: @tabs-tab-bg;
-
-/**
-* @name 10. Toolbar item hover background color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-hover-bg: lighten(@desktop-layout-main-menu-bg, 15%);
-
- /**
- * @name 10. Toolbar border color
- * @type color
- * @group layouts.desktop
- */
-@desktop-layout-toolbar-border-color: @base-border-color;
-
-/**
-* @name 10. Copyright text color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-copyright-color: lighten(@base-text-color, 30.5%);
-
-// Master-detail
-
-/**
-* @name 10. Splitter color
-* @type color
-* @group layouts.split
-*/
-@desktop-splitlayout-border-color: @desktop-layout-toolbar-border-color;
-
 // Fieldset
 
 @fieldset-field-label-color: lighten(@base-label-color, 46%);
diff --git a/styles/widgets/material/color-schemes/material.light.less b/styles/widgets/material/color-schemes/material.light.less
index 6165f4fce80f..749481a390dc 100644
--- a/styles/widgets/material/color-schemes/material.light.less
+++ b/styles/widgets/material/color-schemes/material.light.less
@@ -2001,51 +2001,6 @@
 @colorbox-preview-empty-bg: url(images/widgets/material/color-schemes/light/colorbox/nocolor.png);
 @loadindicator-background-image: url(images/widgets/material/color-schemes/light/loader64.gif);
 
-
-// SPA
-
-// Desktop
-
-@desktop-layout-main-menu-bg: @base-accent;
-
-/**
-* @name 10. Toolbar major color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-color: lighten(@base-text-color, 73.8%);
-@desktop-layout-menu-selected-bg: @tabs-tab-bg;
-
-/**
-* @name 10. Toolbar item hover background color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-menu-hover-bg: lighten(@desktop-layout-main-menu-bg, 15%);
-
- /**
- * @name 10. Toolbar border color
- * @type color
- * @group layouts.desktop
- */
-@desktop-layout-toolbar-border-color: @base-border-color;
-
-/**
-* @name 10. Copyright text color
-* @type color
-* @group layouts.desktop
-*/
-@desktop-layout-copyright-color: lighten(@base-text-color, 30.5%);
-
-// Master-detail
-
-/**
-* @name 10. Splitter color
-* @type color
-* @group layouts.split
-*/
-@desktop-splitlayout-border-color: @desktop-layout-toolbar-border-color;
-
 // Fieldset
 
 @fieldset-field-label-color: lighten(@base-label-color, 46%);
diff --git a/styles/widgets/material/spa.material.less b/styles/widgets/material/spa.material.less
deleted file mode 100644
index 41a62b72f3b2..000000000000
--- a/styles/widgets/material/spa.material.less
+++ /dev/null
@@ -1,50 +0,0 @@
-// Desktop layout
-.dx-desktop-layout-main-menu {
-    background: @desktop-layout-main-menu-bg;
-
-    .dx-nav-item {
-        background: @desktop-layout-main-menu-bg;
-        &.dx-tab-selected {
-            background: @desktop-layout-menu-selected-bg;
-            border-top: 1px solid @desktop-layout-toolbar-border-color;
-
-            .dx-tab-text {
-                color: @tabs-tab-selected-color;
-            }
-
-            &.dx-state-hover {
-                background: @desktop-layout-menu-selected-bg;
-
-                .dx-tab-text {
-                    color: @tabs-tab-selected-color;
-                }
-            }
-        }
-
-        &.dx-state-hover {
-            background: @desktop-layout-menu-hover-bg;
-
-            .dx-tab-text {
-                color: @desktop-layout-menu-color;
-            }
-        }
-
-        .dx-tab-text {
-            color: @desktop-layout-menu-color;
-        }
-    }
-}
-
-.dx-desktop-layout-copyright {
-    color: @desktop-layout-copyright-color;
-}
-
-.dx-desktop-layout-toolbar {
-    background: @desktop-layout-menu-selected-bg;
-    border-bottom-color: @desktop-layout-toolbar-border-color;
-}
-
-// Master-detail layout
-.dx-splitter {
-    border-right-color: @desktop-splitlayout-border-color;
-}
diff --git a/styles/widgets/win10/spa.win10.less b/styles/widgets/win10/spa.win10.less
deleted file mode 100644
index 8b137891791f..000000000000
--- a/styles/widgets/win10/spa.win10.less
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/styles/widgets/win8/spa.win8.less b/styles/widgets/win8/spa.win8.less
deleted file mode 100644
index 8b137891791f..000000000000
--- a/styles/widgets/win8/spa.win8.less
+++ /dev/null
@@ -1 +0,0 @@
-