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[DRAFT] Propagate events into the event's source's tree where appropriate. #1377

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[DRAFT] Propagate events into the event's source's tree where appropriate. #1377

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23 changes: 19 additions & 4 deletions dom.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -401,6 +401,9 @@ signaling that something has occurred, e.g., that an image has completed downloa
<p class=note>Other specifications use <a for=Event>relatedTarget</a> to define a
<code>relatedTarget</code> attribute. [[UIEVENTS]]

<p>An <a>event</a> has an associated <dfn export for=Event>source</dfn> (a
<a>potential event target</a>). Unless stated otherwise it is null.

<p>An <a>event</a> has an associated <dfn export for=Event>touch target list</dfn> (a
<a for=/>list</a> of zero or more <a>potential event targets</a>). Unless stated otherwise it is the
empty list.
Expand Down Expand Up @@ -6398,10 +6401,22 @@ is null.
<hr>

<p>A <a for=/>shadow root</a>'s <a>get the parent</a> algorithm, given an <var>event</var>, returns
null if <var>event</var>'s <a>composed flag</a> is unset and <a for=/>shadow root</a> is the
<a for=tree>root</a> of <var>event</var>'s <a for=Event>path</a>'s first struct's
<a for=Event/path>invocation target</a>; otherwise <a for=/>shadow root</a>'s
<a for=DocumentFragment>host</a>.
the result of the following steps:</p>

<ol>
<li><p>If <var>event</var>’s <a>composed flag</a> is set, return <a for=/>shadow root</a>’s
<a for=DocumentFragment>host</a>.</p></li>
<li><p>Let <var>target</var> be <var>event</var>’s <a for=Event>path</a>'s first struct's
<a for=Event/path>invocation target</a>.</p></li>
<li><p>Let <var>source</var> be <var>event</var>'s <a for=Event>source</a>.</p></li>
<li><p>If <a for=/>shadow root</a> is not the <a for=tree>root</a> of <var>target</var>, and either
<var>source</var> is null or <a for=/>shadow root</a> is not the <a for=tree>root</a> of
<var>source</var>, return <a for=/>shadow root</a>'s <a for=DocumentFragment>host</a>.</p></li>
<li><p>If <var>source</var> is not null, and <var>source</var>'s <a for=tree>root</a> is a
<a>shadow-including ancestor</a> of <a for=/>shadow root</a>, return the result of
<a>retargeting</a> <var>target</var> against <var>source</var>.</p></li>
<li><p>Return null.</p></li>
</ol>

<hr>

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