Write html in php.txt

gistfile1.txt

$html .= <<<EndHTML
        <script>
        require(['prototype'], function(){
        Event.observe($('carriers_tablerate_condition_name'), 'change', checkConditionName.bind(this));
        function checkConditionName(event)
        {
            var conditionNameElement = Event.element(event);
            if (conditionNameElement && conditionNameElement.id) {
                $('time_condition').value = '_' + conditionNameElement.value + '/' + Math.random();
            }
        }
        });
        </script>
EndHTML;