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

> It's common to synthesize a MouseEvent from JavaScript, and in general we can expect that developers won't think to set composed=true on such events (and certainly won't have for existing code). 

Yeah, I think it could happen that developers forget to add 'composed=true', but that should not be a significant problem for developers, I think. They can learn, and fix it easily.

"The value of EventInit dictionary is always used for synthetic events" is an easy rule for developers to remember. That means they do not have to learn: "What is the default value of YYY for synthetic XXX events?"


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