Get the length of the current video:
The duration property returns the length of the current audio/video, in seconds.
If no audio/video is set, NaN (Not-a-Number) is returned.
Note: This property is read-only.
The numbers in the table specify the first browser version that fully supports the property.
|Return Value:||A Number, representing the length of the video, in seconds. If no video is set, "NaN" (Not-a-Number) is returned. If the video is streamed and has no predefined length, "Inf" (Infinity) is returned.|