A milestone (milestone: A reference point marking a major event in a project and used to monitor the project's progress. Any task with zero duration is automatically displayed as a milestone; you can also mark any other task of any duration as a milestone.) is a task that represents a reference point, such as the end of a major phase of a project. Typically, milestones have a duration of zero days, but they can have any duration.
In this demo, I create a task and then specify that it represents a milestone.
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