in example/main.dart [9:22]
void main() {
var firstInput = document.querySelector('#first_input') as InputElement;
var secondInput = document.querySelector('#second_input') as InputElement;
var output = document.querySelector('#output')!;
_inputValues(firstInput)
.combineLatest(_inputValues(secondInput),
(first, second) => 'First: $first, Second: $second')
.tap((v) {
print('Saw: $v');
}).forEach((v) {
output.text = v;
});
}