[css2] Some language changes based on changes in flowobj.src. Also, added sentence about starting point for non-rectangular containing blocks (needs more work?)

ianbjacobs · ianbjacobs · commit ec197e4ea6de · 1997-12-27T00:32:18.000Z
--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%40581
diff --git a/css2/visudet.src b/css2/visudet.src
@@ -1,6 +1,6 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
 <html lang="en">
-<!-- $Id: visudet.src,v 1.30 1997-12-12 01:00:09 howcome Exp $ -->
+<!-- $Id: visudet.src,v 1.31 1997-12-27 00:32:18 ijacobs Exp $ -->
 <HEAD>
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <TITLE>Visual rendering model details</TITLE>
@@ -880,9 +880,13 @@ zero.
 
 <H3><a name="containing-block">Containing blocks</a></H3>
 
-<P>In CSS2, all box positions are calculated with respect to a
-rectangular box called a <span class="index-def" title="containing
-block"> <em>containing block</em></span>. The containing block is defined as follows:
+<P>In CSS2, all box positions are calculated with respect to the inner
+edges of a rectangular box called a <span class="index-def"
+title="containing block"><dfn>containing block</dfn></span>.  The
+default containing block is the box generated for the root element of
+the <a href="convent.html#doctree">document tree</a>.
+
+<P>The containing block is defined as follows:
 
 <ul>
 <li> If a box has no parent, then it has no containing block
@@ -898,14 +902,30 @@ that parent
 of the parent.
 </ul>
 
+<P>When the containing block is established by a <a
+href="flowobj.html#block-level">block-level</a> box, it has the same
+width, height, and position as the content and padding area of the
+block-level box. When the containing block is established by an <a
+href="flowobj.html#inline">inline</a> box, it has the same width,
+height, and position as the content and padding area of the first <a
+href="#line-box">line box</a> generated by the inline box.
+
 <P>For example, for an inline element like EM, the containing block is
 typically the enclosing paragraph (P). On the other hand, the
 containing block of a positioned element is the element relative to
 which it is positioned.
 
 <P>Inline elements with 'position: relative' form a special group of
 containing blocks; they are not block-level elements and -- if they
-span several lines -- they are not rectangular. [HWL: add figure]
+span several lines -- they are not rectangular. The "starting" point
+for relative offsets in a containing block established by inline
+elements is the top left corner of the first line box for
+left-to-right scripts and the top right corner for right-to-left
+scripts. 
+
+<!-- The secondary direction in CSS2 is top-to-bottom. -->
+
+[HWL: add figure]
 
 
 <H2><a name="scaling">Scaling</a></h2>
@@ -924,11 +944,12 @@ class="propinst-line-height">'line-height'</span> and <span
 class="propinst-vertical-align">'vertical-align'</span>
 properties</H2>
 
-<P>As described in the section on <a href="flowobj.html#inline">inline
-layout</a>, user agents flow inline boxes horizontally into a series
-of line boxes. Each line box is a rectangle whose width is defined by
+<P>As described in the section on <a
+href="flowobj.html#horizontal-formatting">horizontal formatting
+contexts</a>, user agents flow inline boxes horizontally into a series
+of <a name="line-box">line boxes</a>. Each line box is a rectangle whose width is defined by
 the first enclosing block element (see the section on <a
-href="flowobj2.html#box-width">box width calculations</a>) 
+href="flowobj2.html#box-width">box width calculations</a>)
 
 <P>The line box height is determined as follows. All elements have the
 <span class="propinst-line-height">'line-height'</span> property,
