[css-scroll-anchoring-1] Reduce the scope of focused element (w3c#5470)

Author: vmpstr

css-scroll-anchoring-1/Overview.bs

@@ -38,6 +38,14 @@ spec: html; urlPrefix: https://html.spec.whatwg.org/multipage/;
         type: dfn;
             text:DOM anchor
             text:focused area of the document
+            text:active match; url: fip-active-match
+    urlPrefix: form-control-infrastructure.html
+        type: dfn;
+            text:mutable; url: concept-fe-mutable
+spec: html; urlPrefix: https://w3c.github.io/editing/docs/execCommand/;
+    urlPrefix: index.html
+        type: dfn;
+            text:editable
 </pre>
 
 <h2 id=intro>
@@ -113,8 +121,10 @@ following criteria:
 
 Some elements are considered to be <dfn
 id="anchor-priority-candidates">priority candidates</dfn> for anchor selection:
-  1. The [=DOM anchor=] of the [=focused area of the document=].
-  2. An element containing the current active selected match of the
+  1. The [=DOM anchor=] of the [=focused area of the document=], if such an anchor
+      is text editable ([=editable=], [=editing host=], [=mutable=] <{textarea}>, or
+      [=mutable=] <{input}> with a type that allows text entry).
+  2. An element containing the current [=active match=] of the
       find-in-page user-agent algorithm. If the match spans multiple elements, then
       consider only the first such element.