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>

It's not the `Range` object that's legacy, it's having to keep around a pretend range for the purposes of the selection API as it was designed pre-shadow-trees that's kinda legacy.

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