[css-scoping] Add issues

Author: fantasai

css-scoping/Overview.bs

@@ -396,6 +396,8 @@ Selecting Into the Light: the '':host'', '':host()'', and '':host-context()'' ps
 <h4 id='shadow-pseudoelement'>
 Selecting Into the Dark: the ''::shadow'' pseudo-element</h4>
 
+	Issue: It's been suggested to remove this feature.
+
 	If an element has at least one <a>shadow tree</a>,
 	the <dfn>::shadow</dfn> pseudo-element matches the <a>shadow roots</a> themselves.
 	In HTML, the <a>shadow root</a> is represented by {{ShadowRoot}} objects.
@@ -448,14 +450,16 @@ Selecting Into the Dark: the ''::shadow'' pseudo-element</h4>
 <h4 id='content-combinator'>
 Selecting Shadow-Projected Content: the ''::slotted'' pseudo-element</h4>
 
+	Issue: It's been proposed to restrict this to child elements only.
+
 	The <dfn selector>::slotted</dfn> pseudo-element
 	matches the list of <a>distributed nodes</a> itself,
 	on elements that have them.
 
 	The ''::slotted'' pseudo-element must not generate boxes,
 	unless specified otherwise in another specification.
 	However, for the purpose of Selectors,
-	the ''::slotted'' pseudo-element is considered to be the parent of the <a>distributed nodes</a>.
+	the ''::slotted'' pseudo-element is considered to be a parent of the <a>distributed nodes</a>.
 
 	<div class="example">
 		For example, say you had a component with both children and a shadow tree,
@@ -499,6 +503,8 @@ Selecting Shadow-Projected Content: the ''::slotted'' pseudo-element</h4>
 <h4 id='deep-combinator'>
 Selecting Through Shadows: the ''>>>'' combinator</h4>
 
+	Issue: It's currently disputed whether this combinator should exist.
+
 	When a <dfn selector id="selectordef-shadow-piercing-descendant-combinator">>>></dfn> combinator
 	(or <dfn export>shadow-piercing descendant combinator</dfn>)
 	is encountered in a selector,