The XMLHttpRequest.timeout
property is an unsigned long
representing the number of milliseconds a request can take before automatically being terminated. The default value is 0, which means there is no timeout. Timeout shouldn't be used for synchronous XMLHttpRequests requests used in a document environment or it will throw an InvalidAccessError
exception. When a timeout happens, a timeout event is fired.
Note: You may not use a timeout for synchronous requests with an owning window.