how can we show two time bars in the gantt?

Gantt
#1

hi friend:

        there is a problem,how can  we show two time bars in the gantt? wo want to   compare the plan time bar and the act time bar.

        look forward your response thanks!
#2

Hello,
You can show any HTML elements over the tasks by using the addTaskLayer feature:
https://docs.dhtmlx.com/gantt/api__gantt_addtasklayer.html
Here are examples with the baselines:
https://docs.dhtmlx.com/gantt/samples/04_customization/15_baselines.html
http://snippet.dhtmlx.com/5/ce45fe596

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