[css-cascade-5] Clarify that style rules are separately cascaded whether important or normal.

Author: fantasai

css-cascade-5/Overview.bs

@@ -860,9 +860,13 @@ Cascade Sorting Order</h3>
 
 		<dt id='style-attr'>The Style Attribute
 		<dd>
-			Declarations that do not belong to a style rule
+			Separately for [=normal=] and [=important=] declarations,
+			declarations that are attached directly to an element
 			(such as the <a href="https://www.w3.org/TR/css-style-attr/#interpret">contents of a style attribute</a>)
-			take precedence over declarations that do belong to a style rule.
+			rather than indirectly mapped by means of a style rule selector
+			take precedence over declarations the same [=importance=]
+			that are mapped via style rule.
+
 		<dt id='cascade-layering'>Layers
 		<dd>
 			Declarations can be explicitly assigned to a [=cascade layer=].