page box -> page context

Author: howcom

css3-cascade/Overview.src.html

@@ -48,10 +48,10 @@ <h2 class="no-num no-toc">[LONGSTATUS] [DATE]</h2>
 <h2 class="no-num no-toc">Abstract</h2>
 
 <p>This CSS3 module describes how to find the specified value for all
-properties on all elements and boxes. Values either come from style
-sheets or the property's initial value. By way of cascading and
-inheritance, values are propagated to all properties on all elements
-and boxes.
+properties on elements, margin boxes, and the page context. Values
+either come from style sheets or the property's initial value. By way
+of cascading and inheritance, values are propagated to all properties
+on all elements and boxes.
 
 <p>This module interfaces with several other modules. It relies on
 [[!CSS3SYN]] to parse the style sheets, on [[!SELECT]] to calculate