downDuration(duration) → {boolean}
Returns true if the Key was pressed down within the duration value given, or false if it either isn't down,
or was pressed down longer ago than then given duration.
Parameters
| Name | Type | Argument | Default | Description | 
|---|---|---|---|---|
duration |  number |  <optional> |  50 | The duration within which the key is considered as being just pressed. Given in ms.  |  
Returns
 boolean - 
 True if the key was pressed down within the given duration.
- Source code: input/Key.js (Line 253)
 
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