[css-overflow] Add issue about rewriting these definitions.

Author: dbaron

css-overflow/Overview.html

@@ -435,14 +435,22 @@ <h3 id=scrollable-overflow><span class=secno>2.2. </span>Scrollable
    the set of things extending outside of that box's padding edge for which a
    scrolling mechanism needs to be provided.
 
+  <p class=issue> The following definition should be rewritten to use the
+   concept of <a
+   href="http://dev.w3.org/csswg/css-transforms/#3d-rendering-context">3D
+   rendering context</a> <a
+   href="#ref-CSS3-TRANSFORMS">[CSS3-TRANSFORMS]<!--{{!CSS3-TRANSFORMS}}--></a>
+   and related terms, particularly once those concepts stabilize following
+   changes proposed in the CSS WG meeting on the morning of 2014-01-28.
+
   <p> Given the following definitions <span class=issue>which belong in <a
    href="#ref-CSS3-TRANSFORMS">[CSS3-TRANSFORMS]<!--{{CSS3-TRANSFORMS}}--></a></span>:
 
   <dl>
    <dt><dfn id=d-preserving-child>3d-preserving child</dfn>
 
-   <dd> A child box C of a parent box P is a 3d-preserving child if it has
-    ‘<code class=css>transform-style: preserve-3d</code>’ and the
+   <dd> A child box B of a containing block C is a 3d-preserving child if it
+    has ‘<code class=css>transform-style: preserve-3d</code>’ and the
     user-agent is not required to flatten it based on the <a
     href="http://www.w3.org/TR/css3-transforms/#transform-style-property">requirements</a>
     in <a
@@ -456,8 +464,9 @@ <h3 id=scrollable-overflow><span class=secno>2.2. </span>Scrollable
    <dt><dfn id=d-preserving-descendant>3d-preserving descendant</dfn>
 
    <dd> Box D is a 3d-preserving descendant of box A if A is an ancestor of
-    D, and D and all of the boxes (if any) in the ancestor chain from D to A
-    are <a href="#d-preserving-child"><i>3d-preserving child</i></a> boxes.
+    D, and D and all of the boxes (if any) in the containing block chain from
+    D to A are <a href="#d-preserving-child"><i>3d-preserving child</i></a>
+    boxes.
   </dl>
 
   <p>The scrollable overflow of a box is the union of the following things,

css-overflow/Overview.src.html

@@ -313,6 +313,14 @@ <h3 id="scrollable-overflow">Scrollable overflow</h3>
 		for which a scrolling mechanism needs to be provided.
 	</p>
 
+	<p class="issue">
+		The following definition should be rewritten to use
+		the concept of <a href="http://dev.w3.org/csswg/css-transforms/#3d-rendering-context">3D rendering context</a> [[!CSS3-TRANSFORMS]]
+		and related terms,
+		particularly once those concepts stabilize following changes
+		proposed in the CSS WG meeting on the morning of 2014-01-28.
+	</p>
+
 	<p>
 		Given the following definitions
 		<span class="issue">which belong in [[CSS3-TRANSFORMS]]</span>:
@@ -321,7 +329,7 @@ <h3 id="scrollable-overflow">Scrollable overflow</h3>
 	<dl>
 		<dt><dfn>3d-preserving child</dfn></dt>
 		<dd>
-			A child box C of a parent box P is a 3d-preserving
+			A child box B of a containing block C is a 3d-preserving
 			child if it has ''transform-style: preserve-3d''
 			and the user-agent is not required to flatten it
 			based on the <a href="http://www.w3.org/TR/css3-transforms/#transform-style-property">requirements</a> in [[!CSS3-TRANSFORMS]].
@@ -335,7 +343,7 @@ <h3 id="scrollable-overflow">Scrollable overflow</h3>
 		<dd>
 			Box D is a 3d-preserving descendant of box A if A is
 			an ancestor of D, and D and all of the boxes (if any)
-			in the ancestor chain from D to A
+			in the containing block chain from D to A
 			are <i>3d-preserving child</i> boxes.
 		</dd>
 	</dl>