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

FWIW, looks like there was code in Gecko which tried to allow changing cancelBubble flag only during target/bubble phase[1], but it was apparently never working, if I trust my own comment from 10 years ago https://bugzilla.mozilla.org/show_bug.cgi?id=330494#c3
(Gecko used to have super hard to maintain and understand event dispatch code before Gecko 1.9, so, around that 10 years ago.)

[1] I think this would be to mimic old IE. IIRC, it has effectively just target and bubble phases.

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