Should relatedTargetScoped flag be set on mousedown/mouseup events?

[rniwa]

Do we really want mousedown and mouseup events to have relatedTargetScoped flag set? The following definition in the current spec seems to indicate any event that uses MouseEvent interface to have this flag set:

A trusted event's relatedTargetScoped flag must be initialized to true if the event has a relatedTarget property

Is this an intentional (that any mousedown/mouseup would not propagate out of a shadow root)?

[hayatoito]

mousedown and mouseup events has a non-null related target?

if the event has a relatedTarget property

I think this should be:

if the event has a non-null relatedTarget property value.

[rniwa]

Yeah, that makes more sense to me.

[rniwa]

On my second thought, other event such as mousemove can also have null so I'm not certain if that's right either.

[hayatoito]

If it's null, I think it's okay not to set relatedTargetScoped flag to true. This does not affect the actual event path, anyway. The observable difference is the value of Event.relatedTargetScoped flag, which is a minor issue, I think.