[css-backgrounds] Update changes, adjust wording on bg-attachment: local wrt clipping area

--HG--
extra : rebase_source : bf48e2c9ded9f8cc3d45ef01c43d33cd5fb60a72

Author: fantasai

css-backgrounds/Overview.html

@@ -12,7 +12,7 @@
   <meta content="CSS Backgrounds and Borders Module Level 3"
    name=dcterms.title>
   <meta content=text name=dcterms.type>
-  <meta content=2013-12-23 name=dcterms.date>
+  <meta content=2013-12-25 name=dcterms.date>
   <meta content="Bert Bos" name=dcterms.creator>
   <meta content="Elika J. Etemad" name=dcterms.creator>
   <meta content="Brad Kemper" name=dcterms.creator>
@@ -42,12 +42,12 @@
 
    <h1>CSS Backgrounds and Borders Module Level 3</h1>
 
-   <h2 class="no-num no-toc">Editor's Draft 23 December 2013</h2>
+   <h2 class="no-num no-toc">Editor's Draft 25 December 2013</h2>
 
    <dl>
     <dt>This version:
 
-    <dd><!-- <a href="http://www.w3.org/TR/2013/CR-css3-background-20131223/">http://dev.w3.org/csswg/css3-background/</a> -->
+    <dd><!-- <a href="http://www.w3.org/TR/2013/CR-css3-background-20131225/">http://dev.w3.org/csswg/css3-background/</a> -->
      <a
      href="http://dev.w3.org/csswg/css3-background/">http://dev.w3.org/csswg/css3-background/</a>
 
@@ -1022,17 +1022,12 @@ <h3 id=the-background-attachment><span class=secno>3.5. </span>Affixing
     href="#background-painting-area"><i>background painting area</i></a> and
     <a href="#background-positioning-area"><i>background positioning
     area</i></a> are relative to the scrollable area of the element rather
-    than to the border framing them. In this case, the background behind the
-    element's border (if any) scrolls as well, even though the border itself
-    does not scroll with the contents. The UA may, however, treat the
-    ‘<code class=css>border-box</code>’ value of ‘<a
+    than to the border framing them. Because the scrollable area does not
+    include the border area, for scrollable elements the ‘<code
+    class=css>border-box</code>’ value of ‘<a
     href="#background-clip"><code
-    class=property>background-clip</code></a>’ as ‘<code
-    class=css>padding-box</code>’ in cases where ‘<a
-    href="#background-attachment"><code
-    class=property>background-attachment</code></a>’ is ‘<a
-    href="#local0"><code class=css>local</code></a>’ and the contents of
-    the element scroll.
+    class=property>background-clip</code></a>’ may be treated the same as
+    ‘<code class=css>padding-box</code>’.
 
    <dt><dfn id=scroll0>scroll</dfn>
 
@@ -4463,6 +4458,15 @@ <h3 id=changes-2012-07><span class=secno>9.1. </span> Changes since the
       href="#spread-distance"><var>spread distance</var></a>). This also
       gives better results for all intermediate states.
 
+     <li>Add definition for how the margin edge is curved in response to
+      border-radius. (This is relevant for <a href="#ref-CSS-SHAPES"
+      rel=biblioentry>[CSS-SHAPES]<!--{{CSS-SHAPES}}--></a>, but does not
+      change conformance to CSS Backgrounds and Borders Level 3.)
+
+     <li>Removed ‘<code class=property>box-decoration-break</code>’; it
+      is now part of <a href="#ref-CSS3-BREAK"
+      rel=biblioentry>[CSS3-BREAK]<!--{{CSS3-BREAK}}--></a>.
+
      <li>Tighten up the definition of spread for ‘<a
       href="#box-shadow"><code class=property>box-shadow</code></a>’.
 
@@ -4476,10 +4480,8 @@ <h3 id=changes-2012-07><span class=secno>9.1. </span> Changes since the
       computed ‘<a href="#border-width"><code
       class=property>border-width</code></a>’, which in this case is zero).
 
-     <li>Add definition for how the margin edge is curved in response to
-      border-radius. (This is relevant for <a href="#ref-CSS-SHAPES"
-      rel=biblioentry>[CSS-SHAPES]<!--{{CSS-SHAPES}}--></a>, but does not
-      change conformance to CSS Backgrounds and Borders Level 3.)
+     <li>Clarified how ‘<code class=css>background-attachment:
+      local</code>’ is affected by scrolling.
 
      <li>Simplified computed value of ‘<a href="#background-position"><code
       class=property>background-position</code></a>’ to clarify that all

css-backgrounds/Overview.src.html

@@ -602,11 +602,9 @@ <h3 id="the-background-attachment">Affixing Images: the 'background-attachment'
       the background scrolls with the element's contents,
       and the <i>background painting area</i> and <i>background positioning area</i>
       are relative to the scrollable area of the element rather than to the border framing them.
-      In this case, the background behind the element's border (if any) scrolls as well,
-      even though the  border itself does not scroll with the contents.
-      The UA may, however, treat the ''border-box'' value of 'background-clip' as
-      ''padding-box'' in cases where 'background-attachment' is ''local''
-      and the contents of the element scroll.</dd>
+      Because the scrollable area does not include the border area,
+      for scrollable elements the ''border-box'' value of 'background-clip'
+      may be treated the same as ''padding-box''.</dd>
   <dt><dfn>scroll</dfn></dt>
     <dd>The background is fixed with regard to the element itself and
       does not scroll with its contents. (It is effectively attached
@@ -3238,11 +3236,13 @@ <h3 id="changes-2012-07">
     to create continuity between sharp corners ('border-radius' = 0)
     and curved corners ('border-radius' > <var>spread distance</var>).
     This also gives better results for all intermediate states.
+  <li>Add definition for how the margin edge is curved in response to border-radius.
+    (This is relevant for [[CSS-SHAPES]], but does not change conformance to CSS Backgrounds and Borders Level 3.)
+  <li>Removed 'box-decoration-break'; it is now part of [[CSS3-BREAK]].
   <li>Tighten up the definition of spread for 'box-shadow'.
   <li>Clarify that a 'border-style' of ''none'' also implies an initial 'border-image-width' of zero
     (since 'border-image-width' is initially set to the computed 'border-width', which in this case is zero).
-  <li>Add definition for how the margin edge is curved in response to border-radius.
-    (This is relevant for [[CSS-SHAPES]], but does not change conformance to CSS Backgrounds and Borders Level 3.)
+  <li>Clarified how ''background-attachment: local'' is affected by scrolling.
   <li>Simplified computed value of 'background-position'
     to clarify that all 'background-position' values are interpolable.
   <li>Added “Animatable” values to each property definition table.