Re: [w3c/uievents] Add .pseudoTarget property to selected event types (PR #413)

@josepharhar commented on this pull request.



> +    <dd>
+     The [=pseudo-element=] that was the target of the interaction,
+     if any. When the event target is an element rather than a
+     [=pseudo-element=], this attribute is <code>null</code>.
+
+     Each {{UIEvent}} has an associated <dfn for="UIEvent">pseudoTargetOrigin</dfn>
+     internal slot (an {{Element}} or <code>null</code>), initialized to
+     <code>null</code>, and an associated <dfn for="UIEvent">pseudoTarget</dfn>
+     internal slot (a {{CSSPseudoElement}} or <code>null</code>), initialized to
+     <code>null</code>.
+
+     To get this attribute, run these steps:
+
+     1. If the [=UIEvent/pseudoTargetOrigin=] internal slot is <code>null</code>, then return <code>null</code>.
+     1. Let |currentTarget| be {{Event/currentTarget}}.
+     1. If |currentTarget| is <code>null</code>, then return <code>null</code>.

If we removed this step to return null when currentTarget is null, then we could access the pseudoTarget after event dispatch like ToggleEvent.source, and in the case where its inside a shadow root then it will still return null to prevent leaking stuff internal to the shadow root because of the later step that returns null:
```
If |retargeted| is not |origin|, then return <code>null</code>.
```
I'm not sure if this is important to support or not, but I figured we should match ToggleEvent.source

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