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

With ~25 days of data, and the metrics looking somewhat stable:

> [How often `cancelBubble` is changed from `false` to `true` (likely common)](https://www.chromestatus.com/metrics/feature/timeline/popularity/1349)

1.306% as of yesterday. So it's indeed common (relatively speaking).

> [and from `true` to `false` (hopefully rare).](https://www.chromestatus.com/metrics/feature/timeline/popularity/1350)

0% for the entire timeline. So it's indeed *extremely* rare.

> [How often the `cancelBubble` flag actually changes which callbacks are invoked (hopefully rare).](https://www.chromestatus.com/metrics/feature/timeline/popularity/1348)

Peaked at 0.027% on the chart.
0.025% as of yesterday.

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So it seems like `cancelBubble` could definitely be simplified to a `stopPropagation()` alias,
and could potentially be removed entirely (0.027% ≤ 0.03% threshold).

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