Issue #7: Be more explicit about gestures

Author: bgirard

index.bs

@@ -104,10 +104,10 @@ Values have the following meanings:
     This value indicates that the element must not perform <a>scroll chaining</a> to any ancestor along the scroll chain regardless of whether the scroll originated at this element or one of its descendants. This value must not modify the overscroll behavior. 
   <dt><dfn>none</dfn>
   <dd>
-    This value implies the same behavior as <a>contain</a> and in addition this element must also not show any overscroll affordances.
+    This value implies the same behavior as <a>contain</a> and in addition this element must also not show any overscroll affordances or perform any navigation guestures.
   <dt><dfn>auto</dfn>
   <dd>
-    This value indicates that the element should perform the usual <a>default action</a> with respect to both <a>scroll chaining</a> and overscroll.
+    This value indicates that the element should perform the usual <a>default action</a> with respect to both <a>scroll chaining</a>, overscroll and navigation guestures.
 </dl>
 
 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.

index.html

@@ -1527,9 +1527,9 @@ <h2 class="heading settled" data-level="4" id="scroll-boundary-behavior-properti
     <dt><dfn class="css" data-dfn-for="scroll-boundary-behavior, scroll-boundary-behavior-x, scroll-boundary-behavior-y" data-dfn-type="value" data-export="" id="valdef-scroll-boundary-behavior-contain">contain<a class="self-link" href="#valdef-scroll-boundary-behavior-contain"></a></dfn> 
     <dd> This value indicates that the element must not perform <a data-link-type="dfn" href="#scroll-chaining" id="ref-for-scroll-chaining-3">scroll chaining</a> to any ancestor along the scroll chain regardless of whether the scroll originated at this element or one of its descendants. This value must not modify the overscroll behavior. 
     <dt><dfn class="css" data-dfn-for="scroll-boundary-behavior, scroll-boundary-behavior-x, scroll-boundary-behavior-y" data-dfn-type="value" data-export="" id="valdef-scroll-boundary-behavior-none">none<a class="self-link" href="#valdef-scroll-boundary-behavior-none"></a></dfn> 
-    <dd> This value implies the same behavior as <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-contain">contain</a> and in addition this element must also not show any overscroll affordances. 
+    <dd> This value implies the same behavior as <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-contain">contain</a> and in addition this element must also not show any overscroll affordances or perform any navigation guestures. 
     <dt><dfn class="dfn-paneled css" data-dfn-for="scroll-boundary-behavior, scroll-boundary-behavior-x, scroll-boundary-behavior-y" data-dfn-type="value" data-export="" id="valdef-scroll-boundary-behavior-auto">auto</dfn> 
-    <dd> This value indicates that the element should perform the usual <a data-link-type="dfn" href="https://www.w3.org/TR/uievents/#default-action">default action</a> with respect to both <a data-link-type="dfn" href="#scroll-chaining" id="ref-for-scroll-chaining-4">scroll chaining</a> and overscroll. 
+    <dd> This value indicates that the element should perform the usual <a data-link-type="dfn" href="https://www.w3.org/TR/uievents/#default-action">default action</a> with respect to both <a data-link-type="dfn" href="#scroll-chaining" id="ref-for-scroll-chaining-4">scroll chaining</a>, overscroll and navigation guestures. 
    </dl>
    <p class="note" role="note"><span>Note:</span> 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.</p>
    <p class="note" role="note"><span>Note:</span> Programmatic scrolling is clamped and can not trigger any <a data-link-type="dfn" href="#boundary-default-action" id="ref-for-boundary-default-action-3">boundary default actions</a>.</p>