[css-text] Make text-align shorthand of text-align-last.

Author: fantasai

css-text/Overview.bs

@@ -17,7 +17,6 @@ Editor: Koji Ishii, Invited Expert, kojiishi@gluesoft.co.jp
 Abstract: This CSS3 module defines properties for text manipulation and specifies their processing model. It covers line breaking, justification and alignment, white space handling, and text transformation.
 At Risk: the ''full-width'' value of 'text-transform'
 At Risk: the <length> values of the 'tab-size' property
-At Risk: the ''start end'' value of 'text-align'
 At Risk: the 'text-justify' property
 At Risk: the percentage values of 'word-spacing'
 At Risk: the 'hanging-punctuation' property
@@ -1214,24 +1213,8 @@ Canonical order: N/A
 
   <p>Alignment and justification controls how inline content is distributed within a line box.
 
-  <div class="issue">
-    <p>There's a proposal for 'text-align' to become a shorthand for 'text-align-last' and ''text-align-all''.
-    This has the advantage that 'text-align-last' can be set in a single declaration with 'text-align',
-    e.g. ''text-align: justify-all'' (justify align all lines) or ''text-align: justify center'' (justify all lines except center last line).
-    It has the disadvantage of creating the ''text-align-all'' property.
-    There are also some cascading considerations:
-    if 'text-align-last' is part of the shorthand, then any declaration of 'text-align' will reset it;
-    it's unclear if this is an advantage or a disadvantage.
-
-    <p>The CSSWG has no strong opinion on this issue, and solicits feedback from others.
-    We unfortunately can't <em>drop</em> 'text-align-last' in favor of an expanded value set in 'text-align'
-    because of existing content and implementations.
-    However, because authors have a pattern of typing 'text-align-last' after 'text-align',
-    we can change their interaction without breaking content.
-  </div>
-
   <h3 id="text-align-property">
-    Text Alignment: the 'text-align' property</h3>
+    Text Alignment: the 'text-align' shorthand</h3>
 
     <table class="propdef">
         <tr>
@@ -1241,7 +1224,7 @@ Canonical order: N/A
         <tr>
           <th><a href="#values">Value</a>:
           <td>start | end | left | right | center |
-              justify | match-parent | start end
+              justify | match-parent | justify-all
           </td>
         </tr>
         <tr>
@@ -1276,7 +1259,8 @@ Canonical order: N/A
           <td>N/A
     </table>
 
-    <p>This property describes how the inline-level content of a block
+    <p>This shorthand property sets the 'text-align-all' and 'text-align-last' properties
+      and describes how the inline-level content of a block
       is aligned along the inline axis
       if the content does not completely fill the line box.
       Values have the following meanings:</p>
@@ -1305,19 +1289,21 @@ Canonical order: N/A
     <dt><dfn>justify</dfn></dt>
       <dd>Text is justified according to the method specified by the 'text-justify' property,
         in order to exactly fill the line box.
+        Unless otherwise specified by 'text-align-last',
+        the last line before a forced break or the end of the block is ''start''-aligned.
+    <dt><dfn>justify-all</dfn></dt>
+      <dd>Same as ''justify'', except 'text-align-last' is also set to ''justify'',
+        forcing the last line to justify as well.
     <dt><dfn>match-parent</dfn></dt>
       <dd>This value behaves the same as ''inherit''
         (computes to its parent's computed value)
         except that an inherited ''start'' or ''end'' keyword
         is interpreted against its parent's 'direction' value
         and results in a computed value of either 'left' or 'right'.
-    <dt><dfn>start end</dfn>
-      <dd>Specifies ''start'' alignment of the first line and any line
-        immediately after a <i>forced line break</i>; 
-        and ''end'' alignment of any remaining lines.
-      <p class="issue">This value will be removed at the end of the LC period unless someone comes up with a more understandable keyword to replace it with.
     </dl>
 
+    <p>All values except ''justify-all'' reset 'text-align-last' to ''text-align-last/auto''.
+
     <p>A block of text is a stack of
       <a href="http://www.w3.org/TR/CSS21/visuren.html#line-box">line boxes</a>.
       This property specifies how the inline-level boxes within each line box
@@ -1342,6 +1328,49 @@ Canonical order: N/A
     <p>See <a href="#bidi-linebox">Bidirectionality and line boxes</a>
       for details on how to determine the <i>start</i> and <i>end</i> edges of a line box.
 
+  <h3 id="text-align-all-property">
+    Default Text Alignment: the 'text-align-all' property</h3>
+
+    <table class="propdef">
+        <tr>
+          <th>Name:
+          <td><dfn>text-align-all</dfn>
+        <tr>
+          <th><a href="#values">Value</a>:
+          <td>start | end | left | right | center |
+              justify | match-parent
+        <tr>
+          <th>Initial:
+          <td>start
+        <tr>
+          <th>Applies to:
+          <td>block containers
+        <tr>
+          <th>Inherited:
+          <td>yes
+        <tr>
+          <th>Percentages:
+          <td>N/A
+        <tr>
+          <th>Media:
+          <td>visual
+        <tr>
+          <th>Computed&#160;value:
+          <td>specified value
+        <tr>
+          <th>Animatable:
+          <td>no
+        <tr>
+          <th>Canonical order:
+          <td>N/A
+    </table>
+
+    <p>This longhand of the 'text-align' shorthand
+    specifies the inline alignment of all lines of inline content in the block container,
+    except for last lines overridden by a non-''text-align-last/auto'' value of 'text-align-last'.
+    See 'text-align' for a full description of values.
+    Authors should use the 'text-align' shorthand instead.
+
   <h3 id="text-align-last-property">
     Last Line Alignment: the 'text-align-last' property</h3>
 
@@ -1388,18 +1417,17 @@ Canonical order: N/A
     </table>
 
     <p>This property describes how the last line of a block or a line
-      right before a <i>forced line break</i> is aligned
-      when 'text-align' is ''justify''.
+      right before a <i>forced line break</i> is aligned.
       If a line is also the first line of the block
       or the first line after a <i>forced line break</i>,
-      then, unless 'text-align' assigns an explicit first line alignment (via ''start end''),
-      'text-align-last' takes precedence over 'text-align'.
+      'text-align-last' takes precedence over 'text-align-all'.
 
-    <p>If <dfn dfn-for=text-align-last dfn-type=value>auto</dfn> is specified, content on the affected line is aligned
-      per 'text-align' unless 'text-align' is set to ''justify''. In
-      this case, content is justified if 'text-justify' is ''distribute''
+    <p>If <dfn dfn-for=text-align-last dfn-type=value>auto</dfn> is specified,
+      content on the affected line is aligned per 'text-align'
+      unless 'text-align' is set to ''justify''.
+      In this case, content is justified if 'text-justify' is ''distribute''
       and start-aligned otherwise.
-      All other values have the same meanings as in 'text-align'.</p>
+      All other values have the same meanings as in 'text-align'.
 
   <h3 id="text-justify-property">
     Justification Method: the 'text-justify' property</h3>
@@ -2331,13 +2359,23 @@ Acknowledgements</h2>
 
 <h2 class="no-num" id="changes">
 Changes</h2>
+
   <h3 class="no-num" id="recent-changes">
-  Changes from the <a href="http://www.w3.org/TR/2012/WD-css3-text-20121113/">November
+  Changes from the <a href="http://www.w3.org/TR/2013/WD-css-text-3-20131010/">October
+  2013 CSS3 Text <abbr title="Last Call Working Draft">LCWD</abbr></a></h3>
+
+  <ul>
+    <li>Made 'text-align' a shorthand of 'text-align-last' and the new 'text-align-all' property.
+    <li>Removed dependence of 'text-align-last' on ''text-align: justify'',
+        since the problem it solves is now solved by the shorthanding relationship.
+  </ul>
+
+  <h3 class="no-num" id="changes-2013">
+  Changes from the <a href="http://www.w3.org/TR/2013/WD-css-text-3-20131010/">November
   2012 CSS3 Text <abbr title="Working Draft">WD</abbr></a></h3>
 
   <p>Major changes include:
   <ul>
-    <li>Changed 'text-align-last' to depend on ''text-align: justify''.
     <li>Removed ''inter-ideograph'', ''inter-cluster'', and ''kashida'' values of 'text-justify'.
     <li>Changed ''text-justify: inter-word'' to prohibit justification between letters.
     <li>Dropped minimum and maximum values in 'letter-spacing' and 'word-spacing'.
@@ -2356,7 +2394,7 @@ Changes</h2>
 
   <p>Significant details updated:
   <ul>
-    <li>Clarified ''start end'' and ''match-parent'' value of 'text-align'.
+    <li>Clarified ''match-parent'' value of 'text-align'.
     <li>Clarified ''text-justify::none'' value of 'text-justify'.
     <li>Clarified <a href="#expanding-text">expanding and compressing text</a> for 'text-justify'.
     <li>Clarified the behavior of 'letter-spacing'.