Re: [whatwg/dom] Allow for customisation of the "get the parent" algorithm (PR #1230)

@keithamus commented on this pull request.



> +</ol>
+
+<p>To <dfn export for=Event id=concept-eventtargetinternals-set-parent>set the parent</dfn> given
+an {{EventTargetInternals}} <var>internals</var> and {{EventTarget}} <var>theParent</var>:
+
+<ol>
+  <li>If <var>theParent</var> is equal to <var>internals</var>' <a
+  for=EventTargetInternals>eventTarget</a> then <a>throw</a> a
+   "{{HierarchyRequestError!!exception}}" {{DOMException}}.
+
+  <li>If <var>theParent</var>'s <a for=EventTarget>attached internals</a>
+  {{EventTargetInternals/parent}} is equal to <var>internals</var>' <a
+  for=EventTargetInternals>eventTarget</a> then<a>throw</a> a "{{HierarchyRequestError!!exception}}"
+  {{DOMException}}.
+
+  <li>Set <var>internal</var>'s <a for=EventTargetInternals>eventTarget</a> <a>get the parent</a>

I couldn't find precedent for setting an algorithm so this is just made up, hopefully it suffices?

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