diff --git a/core/modules/contextual/css/contextual.toolbar.css b/core/modules/contextual/css/contextual.toolbar.css
index 5b84c24accd..729d664793c 100644
--- a/core/modules/contextual/css/contextual.toolbar.css
+++ b/core/modules/contextual/css/contextual.toolbar.css
@@ -14,7 +14,6 @@
   margin: 0;
 }
 .toolbar .toolbar-bar .contextual-toolbar-tab .toolbar-item.is-active {
-  background-image: -webkit-linear-gradient(rgb(78, 159, 234) 0%, rgb(69, 132, 221) 100%);
   background-image: linear-gradient(rgb(78, 159, 234) 0%, rgb(69, 132, 221) 100%);
 }
 
diff --git a/core/modules/toolbar/css/toolbar.theme.css b/core/modules/toolbar/css/toolbar.theme.css
index bdc6c3f1830..b0c8ada3892 100644
--- a/core/modules/toolbar/css/toolbar.theme.css
+++ b/core/modules/toolbar/css/toolbar.theme.css
@@ -44,11 +44,9 @@
 }
 .toolbar .toolbar-bar .toolbar-tab > .toolbar-item:hover,
 .toolbar .toolbar-bar .toolbar-tab > .toolbar-item:focus {
-  background-image: -webkit-linear-gradient(rgba(255, 255, 255, 0.125) 20%, transparent 200%);
   background-image: linear-gradient(rgba(255, 255, 255, 0.125) 20%, transparent 200%);
 }
 .toolbar .toolbar-bar .toolbar-tab > .toolbar-item.is-active {
-  background-image: -webkit-linear-gradient(rgba(255, 255, 255, 0.25) 20%, transparent 200%);
   background-image: linear-gradient(rgba(255, 255, 255, 0.25) 20%, transparent 200%);
 }
 
diff --git a/core/profiles/demo_umami/themes/umami/css/classy/components/progress.css b/core/profiles/demo_umami/themes/umami/css/classy/components/progress.css
index c969473f305..91d793b2e78 100644
--- a/core/profiles/demo_umami/themes/umami/css/classy/components/progress.css
+++ b/core/profiles/demo_umami/themes/umami/css/classy/components/progress.css
@@ -9,7 +9,6 @@
   border-color: #b3b3b3;
   border-radius: 10em;
   background-color: #f2f1eb;
-  background-image: -webkit-linear-gradient(#e7e7df, #f0f0f0);
   background-image: linear-gradient(#e7e7df, #f0f0f0);
   box-shadow: inset 0 1px 3px hsla(0, 0%, 0%, 0.16);
 }
@@ -25,9 +24,6 @@
   border: 1px #07629a solid;
   border-radius: 10em;
   background: #057ec9;
-  background-image:
-    -webkit-linear-gradient(top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.15)),
-    -webkit-linear-gradient(left top, #0094f0 0%, #0094f0 25%, #007ecc 25%, #007ecc 50%, #0094f0 50%, #0094f0 75%, #0094f0 100%);
   background-image:
     linear-gradient(to bottom, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.15)),
     linear-gradient(to right bottom, #0094f0 0%, #0094f0 25%, #007ecc 25%, #007ecc 50%, #0094f0 50%, #0094f0 75%, #0094f0 100%);
diff --git a/core/themes/claro/css/theme/toolbar.theme.pcss.css b/core/themes/claro/css/theme/toolbar.theme.pcss.css
index d7986a07a2b..900ca0a90d5 100644
--- a/core/themes/claro/css/theme/toolbar.theme.pcss.css
+++ b/core/themes/claro/css/theme/toolbar.theme.pcss.css
@@ -47,11 +47,9 @@
 }
 .toolbar .toolbar-bar .toolbar-tab > .toolbar-item:hover,
 .toolbar .toolbar-bar .toolbar-tab > .toolbar-item:focus {
-  background-image: -webkit-linear-gradient(rgba(255, 255, 255, 0.125) 20%, transparent 200%);
   background-image: linear-gradient(rgba(255, 255, 255, 0.125) 20%, transparent 200%);
 }
 .toolbar .toolbar-bar .toolbar-tab > .toolbar-item.is-active {
-  background-image: -webkit-linear-gradient(rgba(255, 255, 255, 0.25) 20%, transparent 200%);
   background-image: linear-gradient(rgba(255, 255, 255, 0.25) 20%, transparent 200%);
 }
 
diff --git a/core/themes/stable9/css/contextual/contextual.toolbar.css b/core/themes/stable9/css/contextual/contextual.toolbar.css
index 5b84c24accd..729d664793c 100644
--- a/core/themes/stable9/css/contextual/contextual.toolbar.css
+++ b/core/themes/stable9/css/contextual/contextual.toolbar.css
@@ -14,7 +14,6 @@
   margin: 0;
 }
 .toolbar .toolbar-bar .contextual-toolbar-tab .toolbar-item.is-active {
-  background-image: -webkit-linear-gradient(rgb(78, 159, 234) 0%, rgb(69, 132, 221) 100%);
   background-image: linear-gradient(rgb(78, 159, 234) 0%, rgb(69, 132, 221) 100%);
 }
 
diff --git a/core/themes/stable9/css/toolbar/toolbar.theme.css b/core/themes/stable9/css/toolbar/toolbar.theme.css
index bdc6c3f1830..b0c8ada3892 100644
--- a/core/themes/stable9/css/toolbar/toolbar.theme.css
+++ b/core/themes/stable9/css/toolbar/toolbar.theme.css
@@ -44,11 +44,9 @@
 }
 .toolbar .toolbar-bar .toolbar-tab > .toolbar-item:hover,
 .toolbar .toolbar-bar .toolbar-tab > .toolbar-item:focus {
-  background-image: -webkit-linear-gradient(rgba(255, 255, 255, 0.125) 20%, transparent 200%);
   background-image: linear-gradient(rgba(255, 255, 255, 0.125) 20%, transparent 200%);
 }
 .toolbar .toolbar-bar .toolbar-tab > .toolbar-item.is-active {
-  background-image: -webkit-linear-gradient(rgba(255, 255, 255, 0.25) 20%, transparent 200%);
   background-image: linear-gradient(rgba(255, 255, 255, 0.25) 20%, transparent 200%);
 }
 
diff --git a/core/themes/starterkit_theme/css/components/progress.css b/core/themes/starterkit_theme/css/components/progress.css
index c969473f305..91d793b2e78 100644
--- a/core/themes/starterkit_theme/css/components/progress.css
+++ b/core/themes/starterkit_theme/css/components/progress.css
@@ -9,7 +9,6 @@
   border-color: #b3b3b3;
   border-radius: 10em;
   background-color: #f2f1eb;
-  background-image: -webkit-linear-gradient(#e7e7df, #f0f0f0);
   background-image: linear-gradient(#e7e7df, #f0f0f0);
   box-shadow: inset 0 1px 3px hsla(0, 0%, 0%, 0.16);
 }
@@ -25,9 +24,6 @@
   border: 1px #07629a solid;
   border-radius: 10em;
   background: #057ec9;
-  background-image:
-    -webkit-linear-gradient(top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.15)),
-    -webkit-linear-gradient(left top, #0094f0 0%, #0094f0 25%, #007ecc 25%, #007ecc 50%, #0094f0 50%, #0094f0 75%, #0094f0 100%);
   background-image:
     linear-gradient(to bottom, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.15)),
     linear-gradient(to right bottom, #0094f0 0%, #0094f0 25%, #007ecc 25%, #007ecc 50%, #0094f0 50%, #0094f0 75%, #0094f0 100%);