downlink read-only property of the
NetworkInformation interface returns the effective bandwidth estimate in
megabits per second, rounded to the nearest multiple of 25 kilobits per seconds. This
value is based on recently observed application layer throughput across recently active
connections, excluding connections made to a private address space. In the absence of
recent bandwidth measurement data, the attribute value is determined by the properties
of the underlying connection technology.
Note that Chrome-based browsers do not conform to the specification, and arbitrarily cap the reported downlink at a maximum of 10 Mbps as an anti-fingerprinting measure. Similar caps exist for the reported latency.
var downLink = NetworkInformation.downlink
The definition of 'downlink' in that specification.
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