scrollbar-width 0 does not affect scrollability

Author: tantek

css-scrollbars-1/Overview.bs

@@ -145,6 +145,9 @@ the thickness of those scrollbars must be no more than the computed 'scrollbar-w
 
 When scrollbar-width is 'auto', implementations must use the default platform scrollbar width.
 
+Note: If scrollbar-width computes to 0, the element’s scrollbars are hidden, 
+however its scrollability is not affected.
+
 UAs must apply the scrollbar-width value set on the root element to the viewport.
 
 Note: Unlike 'overflow' (and overflow-*) properties,