diff --git a/src/wp-admin/css/colors/_mixins.scss b/src/wp-admin/css/colors/_mixins.scss
index cd8bef2a02c76..2dccb17998f5b 100644
--- a/src/wp-admin/css/colors/_mixins.scss
+++ b/src/wp-admin/css/colors/_mixins.scss
@@ -26,7 +26,7 @@
 			0 0 0 var(--wp-admin-border-width-focus, 1.5px) var(--wp-admin-theme-color),
 			inset 0 0 0 1px tokens.$white;
 		/* Visible in Windows High Contrast mode */
-		outline: 1px solid transparent;
+		outline: 2px solid transparent;
 	}
 
 	&:active {
@@ -74,7 +74,8 @@
 		border-color: var(--wp-admin-theme-color);
 		color: var(--wp-admin-theme-color);
 		box-shadow: 0 0 0 var(--wp-admin-border-width-focus, 1.5px) var(--wp-admin-theme-color);
-		outline: 1px solid transparent;
+ 		/* Visible in Windows High Contrast mode */
+		outline: 2px solid transparent;
 	}
 
 	&:active {
@@ -113,7 +114,8 @@
 		border-color: var(--wp-admin-theme-color);
 		color: tokens.$gray-900;
 		box-shadow: 0 0 0 var(--wp-admin-border-width-focus, 1.5px) var(--wp-admin-theme-color);
-		outline: 1px solid transparent;
+		/* Visible in Windows High Contrast mode */
+		outline: 2px solid transparent;
 	}
 
 	&:active {
diff --git a/src/wp-admin/css/common.css b/src/wp-admin/css/common.css
index 8824a31bb8cad..608fe0f75a05d 100644
--- a/src/wp-admin/css/common.css
+++ b/src/wp-admin/css/common.css
@@ -2947,7 +2947,8 @@ div.action-links {
 
 #plugin-information-tabs a:active,
 #plugin-information-tabs a:focus {
-	outline: none;
+	/* Only visible in Windows High Contrast mode */
+	outline: 2px solid transparent;
 }
 
 #plugin-information-content {
diff --git a/src/wp-admin/css/forms.css b/src/wp-admin/css/forms.css
index 2ace16f733004..90d8cf6e63cab 100644
--- a/src/wp-admin/css/forms.css
+++ b/src/wp-admin/css/forms.css
@@ -359,6 +359,8 @@ input[type="radio"].disabled:checked::before {
 	border-color: var(--wp-admin-theme-color);
 	color: #1e1e1e;
 	box-shadow: 0 0 0 var(--wp-admin-border-width-focus, 1.5px) var(--wp-admin-theme-color);
+	/* Only visible in Windows High Contrast mode */
+	outline: 2px solid transparent;
 }
 
 .wp-core-ui select:active {
@@ -379,15 +381,14 @@ input[type="radio"].disabled:checked::before {
 	transform: none;
 }
 
-.wp-core-ui select[aria-disabled="true"] {
-	cursor: default;
+@media all and (forced-colors: active) and (prefers-color-scheme: dark) {
+	.wp-core-ui select {
+		background-image: url(data:image/svg+xml;charset=US-ASCII,%3Csvg%20width%3D%2220%22%20height%3D%2220%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Cpath%20d%3D%22M5%206l5%205%205-5%202%201-7%207-7-7%202-1z%22%20fill%3D%22%23ffffff%22%2F%3E%3C%2Fsvg%3E);
+	}
 }
 
-/* Reset Firefox inner outline that appears on :focus. */
-/* This ruleset overrides the color change on :focus thus needs to be after select:focus. */
-.wp-core-ui select:-moz-focusring {
-	color: transparent;
-	text-shadow: 0 0 0 #0a4b78;
+.wp-core-ui select[aria-disabled="true"] {
+	cursor: default;
 }
 
 /* Remove background focus style from IE11 while keeping focus style available on option elements. */
diff --git a/src/wp-admin/css/themes.css b/src/wp-admin/css/themes.css
index a04dca590aacd..2c59593f4392b 100644
--- a/src/wp-admin/css/themes.css
+++ b/src/wp-admin/css/themes.css
@@ -502,7 +502,8 @@ body.js .theme-browser.search-loading {
 .theme-overlay .theme-header .right:focus,
 .theme-overlay .theme-header .left:focus {
 	box-shadow: none;
-	outline: none;
+	/* Only visible in Windows High Contrast mode */
+	outline: 2px solid transparent;
 }
 
 .theme-overlay .theme-header .left.disabled,
diff --git a/src/wp-includes/css/admin-bar.css b/src/wp-includes/css/admin-bar.css
index c609cc9832e7f..eab5e89c3a996 100644
--- a/src/wp-includes/css/admin-bar.css
+++ b/src/wp-includes/css/admin-bar.css
@@ -683,6 +683,8 @@ html:lang(he-il) .rtl #wpadminbar * {
 	background-color: rgba(255, 255, 255, 0.9);
 	cursor: text;
 	border: 0;
+	/* Only visible in Windows High Contrast mode */
+	outline: 2px solid transparent;
 }
 
 #wpadminbar #adminbarsearch .adminbar-button {