Notes on updating Timeline --------------------------- 1. Add the custom PrimeFaces CSS at the bottom of timeline.css /**************************/ /** Custom PrimeFaces css */ /**************************/ 2. Remove all sourceMaps from both CSS and JS files. You can use Regexp in NotePad++ to remove \/\*(.*?)\*\/ Example: /*# sourceMappingURL=vis-timeline-graph2d.min.css.map */ 3. Remove this last line of 0-vis-timeline.js to remove the source mapping URL //# sourceMappingURL=vis-timeline-graph2d.min.js.map