Tooltip renders on Modal but stays hidden
问题 I have a full calendar inside a bootstrap modal. <div class="modal-body" id="tooltip-container"> <div id="calendar"></div></div> I was trying to add a tooltip with a button. And it worked on jsfiddle. The calendar is loaded just fine. function calendar(eventsArr) { var calendarEl = document.getElementById('calendar'); var calendar = new FullCalendar.Calendar(calendarEl, { plugins: ['dayGrid'], defaultView: 'dayGridMonth', defaultDate: '2020-02-12', events: eventsArr, eventRender: function