om.DisplayRules.afterRun

document.addEventListener('om.DisplayRules.afterRun', function(event) {

	var DisplayRules = event.detail.DisplayRules;

	var Campaign = event.detail.Campaign;

	if ( 'YOUR-CAMPAIGN-ID' === Campaign.id && DisplayRules.show ) {

		if ( 'pepperoni' !== window.pizza ) {

			// Only allow rules to pass if pizza variable exists

			// and it's value is 'pepperoni'.

			DisplayRules.show = false;

		}

	}

} );