[css2] Tantek's modification of Hyatt's proposal inserted with <ins> tags

bert-github · bert-github · commit c08bcb9193ae · 2003-08-27T19:28:38.000Z
--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%402158
diff --git a/css2/visuren.src b/css2/visuren.src
@@ -1,6 +1,6 @@
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
 <html lang="en">
-<!-- $Id: visuren.src,v 2.105 2003-08-27 16:15:48 bbos Exp $ -->
+<!-- $Id: visuren.src,v 2.106 2003-08-27 19:28:38 bbos Exp $ -->
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <title>Visual formatting model</title>
@@ -1206,27 +1206,32 @@ the <span class="propinst-clear">'clear'</span> property</h3>
  <a href="#run-in">run-in boxes</a>,
 this property applies to the final block box to which the run-in box belongs.
 </p>
+<ins class="proposed">
+<p>
+The <dfn>clearance</dfn> dimension is introduced as a dimension above the margin-top of an element that is used to push the element vertically down.
+</p>
+</ins>
 <p>Values have the following meanings when applied to non-floating
 block boxes:</p>
 
 <dl>
 <dt><strong>left</strong></dt>
 
-<dd>The top margin of the generated box is increased enough that the
+<dd>The <span class="delcurrent">top margin</span><span class="insproposed">clearance</span> of the generated box is <span class="delcurrent">increased enough that</span><span class="insproposed"> set to the amount necessary to place</span> the
 top border edge is below the bottom outer edge of any left-floating
 boxes that resulted from elements earlier in the source document.
 </dd>
 
 <dt><strong>right</strong></dt>
 
-<dd>The top margin of the generated box is increased enough that the
+<dd>The <span class="delcurrent">top margin</span><span class="insproposed">clearance</span> of the generated box is <span class="delcurrent">increased enough that</span><span class="insproposed"> set to the amount necessary to place</span> the
 top border edge is below the bottom outer edge of any right-floating
 boxes that resulted from elements earlier in the source document.
 </dd>
 
 <dt><strong>both</strong></dt>
 
-<dd>The top margin of the generated box is increased enough that the
+<dd>The <span class="delcurrent">top margin</span><span class="insproposed">clearance</span> of the generated box is <span class="delcurrent">increased enough that</span><span class="insproposed"> set to the amount necessary to place</span> the
 top border edge is below the bottom outer edge of any right-floating
 and left-floating boxes that resulted from elements earlier in the
 source document.
@@ -1239,11 +1244,11 @@ source document.
 
 <ins class="proposed">
 <p>
-Increasing the margin of an element on which 'clear' is set is done after margin collapsing. First, margins are collapsed and floats earlier in the document tree between collapsed margins that collapse with the top margin of the element on which 'clear' is set are positioned according to the <a
-href="box.html#collapsed-through">rules in section 8.3.3</a>. Next, the element on which 'clear' is set has its margin increased until its top border edge has passed the relevant floats, without affecting the position of earlier elements, and simply pushing the following elements down with it without having their collapsed margins recalculated.
+Computing the clearance of an element on which 'clear' is set is done by first determining the hypothetical position of the element's top border edge within its parent block. This position is determined after the top margin of the element has been collapsed with previous adjacent margins (including the top margin of the parent block). 
+</p><p>
+If the element's top border edge has not passed the relevant floats, then its clearance is set to the amount necessary to place the border edge of the block even with the bottom outer edge of the lowest float that must be cleared.
 </p>
 </ins>
-
 <p>When the property is set on floating elements, it results in a
 modification of the <a href="#float-rules">rules</a> for
 positioning the float. An extra constraint (#10) is added:
@@ -1264,7 +1269,7 @@ may therefore have supported this property on all elements. In CSS2
 and CSS 2.1 the 'clear' property only applies to block-level elements. 
 Therefore authors should only use this property on block-level
 elements.  If an implementation does support clear on inline elements, 
-rather than increasing the top margin as explained above, 
+rather than <span class="delcurrent">increasing the top margin</span><span class="insproposed">setting a clearance</span> as explained above, 
 the implementation should force a break and effectively insert one or more empty line boxes (or shifting the new line box downward as described in <a href="#floats">section 9.5</a>) to move the top of the cleared inline's line box to below the respective floating box(es).
 </em>
 </p>
