[css-scrollbars] Editorial tweak to interaction with ::webkit-scrollbar

See w3c#9856

Author: frivoal

css-scrollbars-1/Overview.bs

@@ -80,6 +80,7 @@ Out Of Scope</h4>
 
 	Note: Exposing the scrollbar-related <code>::-webkit-</code> prefixed pseudo-elements to the Web
 	is considered a mistake by both the CSS Working Group and Webkit.
+	Nevertheless, see [[#color-compat]] and [[#width-compat]].
 
 <h3 id="values">
 Value Definitions</h3>
@@ -309,7 +310,7 @@ Value Definitions</h3>
 Interaction with non-standard features</h3>
 
 	On any element or [=pseudo-element=]
-	where the [=computed value=] of this property is anything other than the initial ''scrollbar-color/auto'' value,
+	where the [=computed value=] of 'scrollbar-color' is anything other than the initial ''scrollbar-color/auto'' value,
 	user agents must ignore any alternative non-standard means
 	for authors to influence the rendering of scrollbars,
 	<span class=non-normative>such as the ''::webkit-scrollbar'' family of [=pseudo-elements=]</span>.
@@ -499,7 +500,7 @@ Interaction with non-standard features</h3>
 Interaction with non-standard features</h3>
 
 	On any element or [=pseudo-element=]
-	where the [=computed value=] of this property is anything other than the initial ''scrollbar-width/auto'' value,
+	where the [=computed value=] of 'scrollbar-width' is anything other than the initial ''scrollbar-width/auto'' value,
 	user agents must ignore any alternative non-standard means
 	for authors to influence the rendering of scrollbars,
 	<span class=non-normative>such as the ''::webkit-scrollbar'' family of [=pseudo-elements=]</span>.