event streams的用法和樣例：
例句
- If event capture or event bubbling is in use, the event flow will be modified as described in the sections below.
如果有的話，事件流會像下面一節中所描述的那樣改變。 - Events which are designated as bubbling will initially proceed with the same event flow as non-bubbling events.
指定起泡的事件會開始繼續做和非起泡事件相同的事件流。
