[w3c/IndexedDB] Error events from open/deleteDatabase requests - cancelable? bubbles? (#86)

For both [open](https://w3c.github.io/IndexedDB/#dom-idbfactory-open) and [deleteDatabase](https://w3c.github.io/IndexedDB/#dom-idbfactory-deletedatabase) the spec has:

> The event does bubble but is not cancelable.

In both Chrome and Firefox, the event is cancelable - why? Is this implementation bugs or spec bug?

Since there is no propagation path for these events (_An open request's get the parent algorithm returns null._) what does bubbling mean here?

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