每個 event 都有一個event.bubbles屬性，可以知道它可否冒泡。(ref：W3定義的Event Interface)
當然 W3 DOM Level 3 Events 的細則里已經附上這個表格了：
| Event Type | Bubbling phase |
|---|---|
| abort | ✗ |
| beforeinput | ✔ |
| blur | ✗ |
| click | ✔ |
| compositionstart | ✔ |
| compositionupdate | ✔ |
| compositionend | ✔ |
| dblclick | ✔ |
| error | ✗ |
| focus | ✗ |
| focusin | ✔ |
| focusout | ✔ |
| input | ✔ |
| keydown | ✔ |
| keyup | ✔ |
| load | ✗ |
| mousedown | ✔ |
| mouseenter | ✗ |
| mouseleave | ✗ |
| mousemove | ✔ |
| mouseout | ✔ |
| mouseover | ✔ |
| mouseup | ✔ |
| resize | ✗ |
| scroll | ✔ |
| select | ✔ |
| unload | ✗ |
| wheel | ✔ |
還附上了 Legacy Events（舊瀏覽器支持的非標准遺留事件）的 bubble 屬性。
| Event Type | Bubbling phase |
|---|---|
| DOMActivate | ✔ |
| DOMAttrModified | ✔ |
| DOMCharacterDataModified | ✔ |
| DOMFocusIn | ✔ |
| DOMFocusOut | ✔ |
| DOMNodeInserted | ✔ |
| DOMNodeInsertedIntoDocument | ✗ |
| DOMNodeRemoved | ✔ |
| DOMNodeRemovedFromDocument | ✗ |
| DOMSubtreeModified | ✔ |
| keypress | ✔ |
H5 還定義了一些新事件：
- media相關事件，都不冒泡
- drag相關事件
dragstart、drag、dragenter、dragexit、dragleave、dragover、drop、dragend均冒泡 - History相關事件：
popstate，hashchange冒泡（從window開始……所以意義在哪里），pagetransition不冒泡
還有很多H5新事件，大多在草案階段，就不一一翻開了。
此外，這里還有一個關於IE的事件列表,http://www.feiesoft.com/html/events.html
事件冒泡是我們實現事件代理（委托）的關鍵，在avalon1.6中，默認讓能冒泡的事件都使用事件代理實現了！
var canBubbleUp = {
click: true,
dblclick: true,
keydown: true,
keypress: true,
keyup: true,
mousedown: true,
mousemove: true,
mouseup: true,
mouseover: true,
mouseout: true,
wheel: true,
mousewheel: true,
input: true,
change: true,
beforeinput: true,
compositionstart: true,
compositionupdate: true,
compositionend: true,
select: true,
cut: true,
paste:true,
focusin: true,
focusout: true,
DOMFocusIn: true,
DOMFocusOut: true,
DOMActivate: true,
dragend:true,
datasetchanged:true
}
if (!W3C) {
delete canBubbleUp.change
delete canBubbleUp.select
}
//....