Re: [whatwg/dom] cancelBubble legacy property (#211)

The `cancelBubble` setter always just sets an internal flag, but that flag isn't used until one gets to the bubbling phase. For full disclosure there is something strange in https://chromium.googlesource.com/chromium/src/+/aede1d0909b3f905c74c769e610b903015f50569/third_party/WebKit/Source/core/events/EventDispatcher.cpp#179 that I don't understand, namely how it looks like multiple targets might end up in the target phase, but whatever the reason is, it's still true that only callbacks invoked while the phase is bubbling are affected.

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