render() {
    return (
      <View
        onTouchStart={() => this.props.onLog('A unspecified touched')}
        style={styles.box}>
        <DemoText style={styles.text}>
          A: unspecified
        </DemoText>
        <View
          pointerEvents="none"
          onTouchStart={() => this.props.onLog('B none touched')}
          style={[styles.box, styles.boxPassedThrough]}>
          <DemoText style={[styles.text, styles.textPassedThrough]}>
            B: none
          </DemoText>
          <View
            onTouchStart={() => this.props.onLog('C unspecified touched')}
            style={[styles.box, styles.boxPassedThrough]}>
            <DemoText style={[styles.text, styles.textPassedThrough]}>
              C: unspecified
            </DemoText>
          </View>
        </View>
      </View>
    );
  }
Capture phase of bubbling to append separator before any of the bubbling
happens.