represents a trigger that can be pressed to make the dynamically updated value of u be continually increased with time from 0 to 1.

Trigger[Dynamic[u], {umin, umax}]
makes u vary from to when triggered.

Trigger[Dynamic[u], {umin, umax, du}]
makes u vary in steps du when triggered.

Trigger[Dynamic[u], {umin, umax}, ups]
makes the value of u increase at a rate of ups units per second when triggered.

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