if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
return false;
}
+ if ( !$this->getTitle()->isSubpageOf( $this->getUser()->getUserPage() ) ) {
+ // Don't execute another user's CSS or JS on preview (T85855)
+ return false;
+ }
return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
}