[cssom-1] adds explicit note about when to not emit scrollend

argyleink · argyleink · commit 669f10d4e67b · 2022-08-10T13:15:26.000-07:00
diff --git a/cssom-view-1/Overview.bs b/cssom-view-1/Overview.bs
@@ -359,6 +359,8 @@ the following steps must be run:
   </ul>
   ...then perform a <a>smooth scroll</a> of <var>box</var> to <var>position</var>. Once the position has finished updating, emit the <a event>scrollend</a> event.
   Otherwise, perform an <a>instant scroll</a> of <var>box</var> to <var>position</var>. After an <a>instant scroll</a> emit the <a event>scrollend</a> event.
+  
+  Note: If the scroll position did not change as a result of the user interaction or programmatic invocation, where no translations were applied as a result, then no <a event>scrollend</a> event fires because no scrolling occured.
 </ol>
 
 Scroll is <dfn lt="scroll completed">completed</dfn> when the scroll position has no more pending updates or translations and the user has completed their gesture. Scroll position updates include smooth or instant mouse wheel scrolling, keyboard scrolling, scroll-snap events, or other APIs and gestures which cause the scroll position to update and possibly interpolate. User gestures like touch panning or trackpad scrolling aren't complete until pointers or keys have released. 
