Placeholder for transitions reset to prevent code duplication… (#29870)

Co-authored-by: Martijn Cuppens <martijn.cuppens@gmail.com>
Co-authored-by: XhmikosR <xhmikosr@gmail.com>

scss/_variables.scss

@@ -212,6 +212,14 @@ $escaped-characters: (
   (")","%29"),
 ) !default;
 
+// Selectors which are isolated in the transition mixin to prevent invalid selector stack
+$pseudo-vendor-prefixes: (
+  "::-webkit-",
+  "::-moz-",
+  "::-ms-"
+) !default;
+
+
 // Options
 //
 // Quickly modify global styling by enabling or disabling optional features.