Adds a capturing subscription to this stream.
If the target of the event is a descendant of the element from which this stream derives then onData
is called before the event propagates down to the target. This is the opposite of bubbling behavior, where the event is first processed for the event target and then bubbles upward.
StreamSubscription<T> capture(void onData(T event));
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-html/ElementStream/capture.html