Merge branch 'master' into correction-contain

Author: majido

README.md

@@ -1,5 +1,7 @@
-# Boundary Scroll Action
+# Scroll Boundary Behavior
 ---
+# Draft Specification
+https://wicg.github.io/scroll-boundary-behavior
 
 # Problem
 
@@ -33,11 +35,3 @@ where:
 * none - Same as contain but also hint that no overscroll affordance should be triggered.
 
 This should apply to all, non-programatic, user scroll actions.
-
-# Issues to file
-
-* Should the property disable scroll chaining through itself to an ancestor if scrolling is initiated from a child element?
-
-* What if the property is attached to a potentially scrollable element without a scrollbox?
-
-* What if the property is attached to an element which is not scrollable?

index.bs

@@ -57,7 +57,7 @@ Scroll chaining and boundary default actions {#scroll-chaining-and-boundary-defa
 
 A <dfn>scroll chain</dfn> is the order in which scrolling is propagated from one <a>scroll container</a> to another.
 
-<dfn>Scroll boundary</dfn> refers to when the scroll position of a <a>scroll container</a> reaches the edge of the <a>scrollport<a>. If a scroll container has no potential to scroll, because it does not <a>overflow</a> in the direction of the scroll, the element is always considered to be at the scroll boundary. 
+<dfn>Scroll boundary</dfn> refers to when the scroll position of a <a>scroll container</a> reaches the edge of the <a>scrollport<a>. If a scroll container has no potential to scroll, because it does not <a>overflow</a> in the direction of the scroll, the element is always considered to be at the scroll boundary.
 
 <dfn>Boundary default action</dfn> refers to the user-agent-defined <a>default action</a> performed when scrolling against the edge of the <a>scrollport</a>. A <a>boundary default action</a> is said to be <dfn>local</dfn>, for example overscroll, if it is performed on the <a>scroll container</a> without interacting with the page. Conversely, a <dfn>non-local boundary default action</dfn> will interact with the page such as scroll chaining or a navigation action.
 
@@ -110,6 +110,7 @@ Values have the following meanings:
     ancestors along the <a>scroll chain</a> regardless of whether the scroll originated at this
     element or one of its descendants. This value must not modify the behavior of how <a>local
     boundary default actions</a> should behave, such as overscroll behavior.
+
   <dt><dfn>none</dfn>
   <dd>
     This value implies the same behavior as <a>contain</a> and in addition this element must also
@@ -123,3 +124,14 @@ Values have the following meanings:
 Note: In the case where a user agent does not implement scroll chaining and overscroll affordances, these values will have no side effects for a compliant implementation.
 
 Note: Programmatic scrolling is clamped and can not trigger any <a>boundary default actions</a>.
+
+
+Security and Privacy Considerations
+===================================
+There are no known security or privacy impacts of this feature. The feature may be used to prevent
+certain native UI features such as overscroll affordances and overscroll navigations (e.g., pull-
+to-refresh, swipe navigations). However, this does not expose any additional abilities beyond what
+is already possible in the platform e.g., by preventing the default action of the event that would
+cause a scroll.
+
+