Re: [w3c/webcomponents] Events whose composed flag should be true (#513)

Thank you for the feedback. Yeah, I am aware that the current conclusion would cause a burden on developers in the short term. However,

-`composed` has an effect only when they dispatch a synthetic event in v1 shadow tree (or its descendant trees). In other cases, nothing changes.
- Regarding Blink,  `composed` flag has no effect for v0 shadow tree. This flag is actually used only for v1 shadow tree. I did it intentionally so that I do not break any web site which is using v0 shadow trees.

If we made the behavior of `composed` inconsistent with `bubbles` (or other properties) to avoid trap in the short term, we will regret that in the long term, I think.

In addition to that, I think we still have an issue on technical feasibility on "per-interface" basis, as I explained in
https://github.com/w3c/webcomponents/issues/513#issuecomment-224477918


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