[css-font-loading] Add a note about FontFaces just being removed from the font source, not actually deleted or anything.

Author: tabatkins

css-font-loading/Overview.bs

@@ -965,6 +965,11 @@ Interaction with CSS’s ''@font-face'' Rule</h3>
 	must be added or removed from the document's <a>font source</a>,
 	and maintain this ordering.
 
+	Note: Authors can still maintain references to a removed {{FontFace}},
+	even if it's been automatically removed from a <a>font source</a>.
+	As specified in [[#font-face-css-connection]], though,
+	the {{FontFace}} is no longer <a>CSS-connected</a> at that point.
+
 	All non-<a>CSS-connected</a> {{FontFace}} objects must be sorted after the <a>CSS-connected</a> ones,
 	in insertion order.
 

css-font-loading/Overview.html

@@ -987,6 +987,12 @@ <h3 class="heading settled" data-level=4.2 id=document-font-face-set><span class
 	must be added or removed from the document’s <a data-link-type=dfn href=#font-source title="font source">font source</a>,
 	and maintain this ordering.</p>
 
+<p class=note>Note: Authors can still maintain references to a removed <code class=idl><a data-link-type=idl href=#dom-fontface title=FontFace>FontFace</a></code>,
+	even if it’s been automatically removed from a <a data-link-type=dfn href=#font-source title="font source">font source</a>.
+	As specified in <a data-section="" href=#font-face-css-connection>§2.3 
+Interaction with CSS’s @font-face Rule</a>, though,
+	the <code class=idl><a data-link-type=idl href=#dom-fontface title=FontFace>FontFace</a></code> is no longer <a data-link-type=dfn href=#css-connected title=CSS-connected>CSS-connected</a> at that point.</p>
+
 <p>All non-<a data-link-type=dfn href=#css-connected title=CSS-connected>CSS-connected</a> <code class=idl><a data-link-type=idl href=#dom-fontface title=FontFace>FontFace</a></code> objects must be sorted after the <a data-link-type=dfn href=#css-connected title=CSS-connected>CSS-connected</a> ones,
 	in insertion order.</p>