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

>From this description it sounds like we don't even know for sure that removing `cancelBubble` completely would be incompatible.  Every browser has it, right?  Is it work preparing a patch that uses a use counter to track whether `cancelBubble` actually as an impact (i.e. at bubbling time log if `cancelBubble` was used without `stopPropagation` being used redundantly), and using the telemetry cluster to look for examples in the top 10k?

Or is the cost of having it as an alias of `stopPropagation` low enough, and the compat risk sufficiently non-trivial that we should just do it?

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