Re: [whatwg/dom] Add definition for composed selection range (PR #1342)

@annevk commented on this pull request.



>  
 <p class=note>Algorithms that modify a <a>tree</a> (in particular the <a for=/>insert</a>,
 <a for=/>remove</a>, <a>replace data</a>, and <a lt="split a Text node">split</a> algorithms) modify
-<a>live ranges</a> associated with that <a>tree</a>.
+<a>live ranges</a> associated with that <a>tree</a>.</p>
+
+<p>A <dfn export id=concept-composed-selection-range>composed selection range</dfn> is a
+<a>live range</a> that has an associated {{Range}} object, a
+<dfn export id=concept-legacy-selection-range for="composed selection range">legacy selection range</dfn>.</p>

Based on an email conversation I'm a bit less sure what the semantics of this range are. Say you have an element with a shadow root that contains the word "Test". The end user selects "es". `getSelection()` should not provide access to this shadow root, but apparently the set of changes proposed here do not enforce that. Or am I misunderstanding something?

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