Fix button references.

Author: flackr

css-overflow-4/Overview.bs

@@ -342,7 +342,7 @@ Overflow Controls: the 'scroll-markers' property and pseudo-elements</h3>
 	as if it was a child of the ''::scroll-marker-group'' box on its nearest ancestor [=scroll container=].
 	These boxes are added in the [=tree order=] of their <a>originating element</a>.
 
-	These pseudo-elements behave as a ''&lt;button>''
+	These pseudo-elements behave as a <{button}>
 	with {{HTMLButtonElement/scrollTargetElement}} set to its <a>originating element</a>.
 	They can be focused and invoked.
 
@@ -2194,9 +2194,9 @@ showing in which case space is reserved for the <a>scrollbar gutter</a>.
 	in which exactly one control in the group can have its 'checked' state set to true.
 	A [=scroll marker control=] with a true 'checked' state can be styled by the '':checked'' pseudo-class.
 
-	The [=scroll marker group=] that contains a ''&lt;button>'' element a also contains all the other ''&lt;button>'' elements b that fulfill the following conditions:
+	The [=scroll marker group=] that contains a <{button}> element a also contains all the other <{button}> elements b that fulfill the following conditions:
 
-	* The ''&lt;button>'' element b has a non-null {{HTMLButtonElement/scrollTargetElement}} value.
+	* The <{button}> element b has a non-null {{HTMLButtonElement/scrollTargetElement}} value.
 	* a and b's {{HTMLButtonElement/scrollTargetElement}} have the same nearest [=scroll container=].
 
 	<div algorithm="scrollTargetElement activation">