This interface provides a means to cancel an operation that is in progress.
Last changed in Gecko 1.8 (Firefox 1.5 / Thunderbird 1.5 / SeaMonkey 1.0)
void cancel(in nsresult aReason);
Call this method to request that this object abort whatever operation it may be performing.
in nsresult aReason
- A failure code indicating why the operation is being canceled. It is an error to pass a success code.
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