[css-transitions] Revert the change adding the concept of after-transition style, since I believe the problem it was intended to solve did not exist, and it just made things worse.

I intend to post to www-style with more details within a few days.

Author: dbaron

css-transitions/Overview.html

@@ -10,7 +10,7 @@
    rel=dcterms.rights>
   <meta content="CSS Transitions" name=dcterms.title>
   <meta content=text name=dcterms.type>
-  <meta content=2014-12-28 name=dcterms.date>
+  <meta content=2015-01-20 name=dcterms.date>
   <meta content="L. David Baron" name=dcterms.creator>
   <meta content=W3C name=dcterms.publisher>
   <meta content="http://dev.w3.org/csswg/css3-transitions/"
@@ -40,7 +40,7 @@
 
    <h1>CSS Transitions</h1>
 
-   <h2 class="no-num no-toc">Editor's Draft 28 December 2014</h2>
+   <h2 class="no-num no-toc">Editor's Draft 20 January 2015</h2>
 
    <dl>
     <dt>This version:
@@ -107,7 +107,7 @@ <h2 class="no-num no-toc">Editor's Draft 28 December 2014</h2>
    <!--begin-copyright-->
    <p class=copyright><a
     href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright"
-    rel=license>Copyright</a> © 2014 <a href="http://www.w3.org/"><abbr
+    rel=license>Copyright</a> © 2015 <a href="http://www.w3.org/"><abbr
     title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> (<a
     href="http://www.csail.mit.edu/"><abbr
     title="Massachusetts Institute of Technology">MIT</abbr></a>, <a
@@ -937,32 +937,8 @@ <h2 id=starting><span class=secno>3. </span> Starting of transitions</h2>
    id=after-change-style>after-change style</dfn> as the computed style for
    the element based on the information known at the start of that <a
    href="#style-change-event">style change event</a>, but excluding any
-   styles from CSS Transitions in the computation, and inheriting from the
-   <span>after-transition style of the parent. <span class=note>(Note that
-   inheriting from the <a href="#after-transition-style">after-transition
-   style</a> of the parent is needed to ensure that transitions are canceled
-   properly when an ancestor and descendant are running transitions on the
-   same inherited property.)</span> Finally, define the <dfn
-   id=after-transition-style>after-transition style</dfn> as the computed
-   style for the element based on the information known at the start of that
-   <a href="#style-change-event">style change event</a>, excluding any styles
-   from CSS Transitions that are started or stopped during that <a
-   href="#style-change-event">style change event</a>, but including any
-   styles from CSS Transitions that exist before the <a
-   href="#style-change-event">style change event</a> and are not stopped
-   during it (these are defined below), also inheriting from the <a
-   href="#after-transition-style">after-transition style</a> of the parent.
-   </span>
-
-  <p class=note> Note that the <span>after-change style and the <a
-   href="#after-transition-style">after-transition style</a> both exclude any
-   changes resulting from CSS Transitions that start during that <a
-   href="#style-change-event">style change event</a>, and both exclude styles
-   from CSS Transitions that are stopped during the <a
-   href="#style-change-event">style change event</a>. They differ in how they
-   include styles from CSS Transitions that existed before the <a
-   href="#style-change-event">style change event</a> and continue running
-   after it. </span>
+   styles from CSS Transitions in the computation, and inheriting from the <a
+   href="#after-change-style">after-change style</a> of the parent.
 
   <div class=note>
    <p> Note that this definition of the <a
@@ -1910,13 +1886,8 @@ <h2 id=changes><span class=secno>9. </span>Changes since Working Draft of
 
   <ul>
    <li>Canceling and interrupting of running transitions is defined much more
-    precisely. This involved introducing the new concept of <a
-    href="#after-transition-style">after-transition style</a>, which also
-    means that the <a href="#after-change-style">after-change style</a> is no
-    longer a tree of style at a single point in time (since the transition
-    computation on a parent element depends on the after-change style for
-    that parent, but is required prior to computing the after-change style
-    for its children).
+    precisely. This includes the after-change style no longer including
+    styles from CSS Transitions.
 
    <li>Completion of transitions is defined somewhat more precisely.
 
@@ -2169,9 +2140,6 @@ <h2 class=no-num id=index>Index</h2>
    <li>after-change style, <a href="#after-change-style"
     title="section 3."><strong>3.</strong></a>
 
-   <li>after-transition style, <a href="#after-transition-style"
-    title="section 3."><strong>3.</strong></a>
-
    <li>before-change style, <a href="#before-change-style"
     title="section 3."><strong>3.</strong></a>
 

css-transitions/Overview.src.html

@@ -946,34 +946,7 @@ <h2 id="starting">
         known at the start of that <span>style change event</span>,
         but excluding any styles from CSS Transitions in the computation,
         and inheriting from
-        the <span>after-transition style</dfn> of the parent.
-        <span class="note">(Note that inheriting from the
-        <span>after-transition style</span> of the parent is needed to
-        ensure that transitions are canceled properly
-        when an ancestor and descendant are running transitions
-        on the same inherited property.)</span>
-        Finally, define the <dfn>after-transition style</dfn> as
-        the computed style for the element based on the information
-        known at the start of that <span>style change event</span>,
-        excluding any styles from CSS Transitions that are started or
-        stopped during that <span>style change event</span>, but
-        including any styles from CSS Transitions that exist before
-        the <span>style change event</span> and are not stopped during it
-        (these are defined below),
-        also inheriting from the <span>after-transition style</span>
-        of the parent.
-      </p>
-
-      <p class="note">
-        Note that the <span>after-change style</dfn> and
-        the <span>after-transition style</span>
-        both exclude any changes resulting from CSS Transitions
-        that start during that <span>style change event</span>,
-        and both exclude styles from CSS Transitions
-        that are stopped during the <span>style change event</span>.
-        They differ in how they include styles from CSS Transitions
-        that existed before the <span>style change event</span>
-        and continue running after it.
+        the <span>after-change style</span> of the parent.
       </p>
 
       <div class="note">
@@ -1916,7 +1889,7 @@ <h2 id="changes">Changes since Working Draft of 19 November 2013</h2>
 dated 19 November 2013</a>:</p>
 
 <ul>
-  <li>Canceling and interrupting of running transitions is defined much more precisely.  This involved introducing the new concept of <span>after-transition style</span>, which also means that the <span>after-change style</span> is no longer a tree of style at a single point in time (since the transition computation on a parent element depends on the after-change style for that parent, but is required prior to computing the after-change style for its children).</p>
+  <li>Canceling and interrupting of running transitions is defined much more precisely.  This includes the after-change style no longer including styles from CSS Transitions.</p>
   <li>Completion of transitions is defined somewhat more precisely.</p>
   <li>The transitionend event is no longer cancelable.  This is since it has no default action, so canceling it would have no meaning.  It also matches the animation events.</p>
   <li>The interpolation of ''inset'' values on shadow lists is no longer backwards.</p>