<!DOCTYPE html> <html charset="utf-8"> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" /> <title>GanttElastic editor demo</title> <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script> <script src="https://cdn.jsdelivr.net/npm/dayjs"></script> <script src="https://unpkg.com/gantt-elastic/dist/Ga