The Webform Custom Error Message module adds rules to the Webform Validation module, which can be used to add the custom error message for the various fields of the webform.
This module adds current breakpoint (xs,sm,md,lg) as body class for easy CSS writing depending on viewport width. Requires Bootstrap 3 theme or subtheme.
Expire module doesn't have direct support for flag.If the flag is activated for the anonymous user & varnish or any reverse proxy is working behind the back-end, then purging an URL will be nec