The idea behind this is to allow developers to determine if the
button data have been updated from the hardware. The value must be
relative to the
navigationStart attribute of the
PerformanceTiming interface. Values are monotonically
increasing, meaning that they can be compared to determine the ordering of updates, as
newer values will always be greater than or equal to older values.
Note: This property is not currently supported anywhere.
var gp = navigator.getGamepads(); console.log(gp.timestamp);
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