[scroll-animations-1] Define view() notation #7587

Author: fantasai

scroll-animations-1/Overview.bs

@@ -355,8 +355,9 @@ spec: cssom-view-1; type: dfn;
 	at the start edge of the [=scrollable overflow rectangle=],
 	it might not be possible to scroll to < 32% progress.
 
-	[=View progress timelines=] can be referenced in 'animation-timeline' by name
-	(see [[#timeline-scope]])
+	[=View progress timelines=] can be referenced
+	anonymously using the ''view()'' [=functional notation=]
+	or by name (see [[#timeline-scope]])
 	after declaring them using the 'view-timeline' properties
 	on the view progress subject.
 	In the Web Animations API,
@@ -417,6 +418,27 @@ spec: cssom-view-1; type: dfn;
 
 ## Anonymous View Progress Timelines ## {#view-timelines-anonymous}
 
+### The ''view()'' notation ### {#view-notation}
+
+	The <dfn>view()</dfn> functional notation
+	can be used as a value of 'animation-timeline'
+	and specifies a [=view progress timeline=]
+	in reference to the nearest ancestor [=scroll container=].
+	Its syntax is
+
+	<pre class="prod">
+		<<view()>> = view( [ <<axis>> || <<'view-timeline-inset'>> ]? )
+	</pre>
+
+	By default,
+	''view()'' references the [=block axis=];
+	as for ''scroll()'',
+	this can be changed by providing an explicit <<axis>> value.
+
+	The optional <<'view-timeline-inset'>> value provides an adjustment
+	of the [=view progress visibility range=],
+	as defined for 'view-timeline-inset'.
+
 ### The {{ViewTimeline}} Interface ### {#viewtimeline-interface}
 
 	<pre class="idl">