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

In Gecko UIEvent has that indeed and it sets the propagation stopped flag. This is really ancient stuff.
I thought we could have removed it, like to removed couple of similar properties few years ago.
IIRC, this is Netscapeism.

Looks like the property works in a bit different way in different browsers. In Gecko it maps to
stopPropagation() and you can effectively un-stopPropagation() with cancelBubble = false.
In Blink you can also cancel, but only cancelBubble = true, not stopPropagation().

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