Is-element-nonceable should check if the attribute's name |contains| …

…<script/<style>

index.bs

@@ -4108,13 +4108,11 @@ this algorithm returns normally if compilation is allowed, and throws a
   2.  If |element| is a <{script}> element, then <a for=list>for each</a> |attribute| of
       |element|'s <a for=Element>attribute list</a>:
 
-      1.  If |attribute|'s name is an <a>ASCII case-insensitive</a> match for
-          the string "<code>&lt;script</code>" or the string
-          "<code>&lt;style</code>", return "`Not Nonceable`".
+      1.  If |attribute|'s name contains an <a>ASCII case-insensitive</a> match for
+          "<code>&lt;script</code>" or "<code>&lt;style</code>", return "`Not Nonceable`".
 
-      2.  If |attribute|'s value contains an <a>ASCII case-insensitive</a> match
-          the string "<code>&lt;script</code>" or the string
-          "<code>&lt;style</code>", return "`Not Nonceable`".
+      2.  If |attribute|'s value contains an <a>ASCII case-insensitive</a> match for
+          "<code>&lt;script</code>" or "<code>&lt;style</code>", return "`Not Nonceable`".
 
   3.  If |element| had a [=duplicate-attribute=] [=parse error=] during tokenization, return
       "`Not Nonceable`".