Ticket #39797: 39797.0.diff

src/wp-includes/js/customize-preview.js

@@ -147 +147 @@
 
                         isInternalJumpLink = ( '#' === link.attr( 'href' ).substr( 0, 1 ) );
 
-                        // Allow internal jump links to behave normally without preventing default.
-                        if ( isInternalJumpLink ) {
+                        // Allow internal jump links and JS links to behave normally without preventing default.
+                        if ( isInternalJumpLink || 'javascript:' === link.prop( 'protocol' ) ) { // jshint ignore:line
                                 return;
                         }
 
@@ -335 +335 @@
                 }
 
                 // Ignore links with href="#" or href="#id".
-                if ( '#' === $( element ).attr( 'href' ).substr( 0, 1 ) ) {
+                if ( '#' === $( element ).attr( 'href' ).substr( 0, 1 ) || 'javascript:' === element.protocol ) { // jshint ignore:line
                         return;
                 }