[css-device-adapt] Allow 0 for <viewport-length> and zoom values.

--HG--
extra : rebase_source : fc16ca0f8924034d17ac35b9bde86a5241f327da

Author: Rune Lillesveen

css-device-adapt/Overview.html

@@ -11,7 +11,7 @@
    rel=dcterms.rights>
   <meta content="CSS Device Adaptation" name=dcterms.title>
   <meta content=text name=dcterms.type>
-  <meta content=2013-05-02 name=dcterms.date>
+  <meta content=2013-05-07 name=dcterms.date>
   <meta content="Rune Lillesveen" name=dcterms.creator>
   <meta content="Øyvind Stenhaug" name=dcterms.creator>
   <meta content="Florian Rivoal" name=dcterms.creator>
@@ -30,13 +30,13 @@
 
    <h1>CSS Device Adaptation</h1>
 
-   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 2 May 2013</h2>
+   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 7 May 2013</h2>
 
    <dl>
     <dt>This version:
 
     <dd>$Date$ (editor's draft)
-     <!--<dd><a href="http://dev.w3.org/csswg/css-device-adapt/">http://www.w3.org/TR/2013/WD-css-device-adapt-20130502/</a></dd>-->
+     <!--<dd><a href="http://dev.w3.org/csswg/css-device-adapt/">http://www.w3.org/TR/2013/WD-css-device-adapt-20130507/</a></dd>-->
 
     <dt>Latest version:
 
@@ -575,14 +575,14 @@ <h3 id=the-lsquomin-widthrsquo-and-lsquomax-wid><span class=secno>5.1.
    <dt><var>&lt;length&gt;</var>
 
    <dd>
-    <p>A positive absolute or relative length.
+    <p>A non-negative absolute or relative length.
 
    <dt><var>&lt;percentage&gt;</var>
 
    <dd>
     <p>A percentage value relative to the width or height of the <a
      href="#initial-viewport">initial viewport</a> at zoom factor 1.0, for
-     horizontal and vertical lengths respectively. Must be positive.
+     horizontal and vertical lengths respectively. Must be non-negative.
   </dl>
 
   <p>The min-width and max-width descriptors are inputs to the <a
@@ -806,7 +806,7 @@ <h3 id=the-lsquozoomrsquo-descriptor><span class=secno>5.5. </span>The
      <td><em>Computed value:</em>
 
      <td>‘<a href="#auto0"><code class=css
-      title="auto!!zoom">auto</code></a>’, or a positive number or
+      title="auto!!zoom">auto</code></a>’, or a non-negative number or
       percentage as specified.
   </table>
 
@@ -831,16 +831,16 @@ <h3 id=the-lsquozoomrsquo-descriptor><span class=secno>5.5. </span>The
    <dt><var>&lt;number&gt;</var>
 
    <dd>
-    <p>A positive number used as a zoom factor. A factor of 1.0 means that no
-     zooming is done. Values larger than 1.0 gives a zoomed-in effect and
-     values smaller than 1.0 a zoomed-out effect.
+    <p>A non-negative number used as a zoom factor. A factor of 1.0 means
+     that no zooming is done. Values larger than 1.0 gives a zoomed-in effect
+     and values smaller than 1.0 a zoomed-out effect.
 
    <dt><var>&lt;percentage&gt;</var>
 
    <dd>
-    <p>A positive percentage value used as a zoom factor. A factor of 100%
-     means that no zooming is done. Values larger than 100% gives a zoomed-in
-     effect and values smaller than 100% a zoomed-out effect.
+    <p>A non-negative percentage value used as a zoom factor. A factor of
+     100% means that no zooming is done. Values larger than 100% gives a
+     zoomed-in effect and values smaller than 100% a zoomed-out effect.
   </dl>
 
   <h3 id=the-lsquomin-zoomrsquo-descriptor><span class=secno>5.6. </span>The
@@ -878,7 +878,7 @@ <h3 id=the-lsquomin-zoomrsquo-descriptor><span class=secno>5.6. </span>The
      <td><em>Computed value:</em>
 
      <td>‘<a href="#auto1"><code class=css
-      title="auto!!min-zoom">auto</code></a>’, or a positive number or
+      title="auto!!min-zoom">auto</code></a>’, or a non-negative number or
       percentage as specified.
   </table>
 
@@ -907,12 +907,13 @@ <h3 id=the-lsquomin-zoomrsquo-descriptor><span class=secno>5.6. </span>The
    <dt><var>&lt;number&gt;</var>
 
    <dd>
-    <p>A positive number limiting the minimum value of the zoom factor.
+    <p>A non-negative number limiting the minimum value of the zoom factor.
 
    <dt><var>&lt;percentage&gt;</var>
 
    <dd>
-    <p>A positive percentage limiting the minimum value of the zoom factor.
+    <p>A non-negative percentage limiting the minimum value of the zoom
+     factor.
   </dl>
 
   <h3 id=the-lsquomax-zoomrsquo-descriptor><span class=secno>5.7. </span>The
@@ -950,7 +951,7 @@ <h3 id=the-lsquomax-zoomrsquo-descriptor><span class=secno>5.7. </span>The
      <td><em>Computed value:</em>
 
      <td>‘<a href="#auto2"><code class=css
-      title="auto!!max-zoom">auto</code></a>’, or a positive number or
+      title="auto!!max-zoom">auto</code></a>’, or a non-negative number or
       percentage as specified.
   </table>
 
@@ -979,12 +980,13 @@ <h3 id=the-lsquomax-zoomrsquo-descriptor><span class=secno>5.7. </span>The
    <dt><var>&lt;number&gt;</var>
 
    <dd>
-    <p>A positive number limiting the maximum value of the zoom factor.
+    <p>A non-negative number limiting the maximum value of the zoom factor.
 
    <dt><var>&lt;percentage&gt;</var>
 
    <dd>
-    <p>A positive percentage limiting the maximum value of the zoom factor.
+    <p>A non-negative percentage limiting the maximum value of the zoom
+     factor.
   </dl>
 
   <h3 id=the-lsquouser-zoomrsquo-descriptor><span class=secno>5.8. </span>The
@@ -1225,7 +1227,9 @@ <h4 class="no-num no-toc" id=resolve-width-value>Resolve <code
 
    <li>If <code title="width!!resolved">width</code> is ‘<code
     class=css>auto</code>’, set <code>width = height * (initial-width /
-    initial-height)</code>
+    initial-height)</code>, or <code>width = initial-width</code> if <code
+    class=index id=initial-height0
+    title="height!!initial">initial-height</code> is 0.
   </ol>
 
   <h4 class="no-num no-toc" id=resolve-height-value>Resolve <code
@@ -1234,7 +1238,9 @@ <h4 class="no-num no-toc" id=resolve-height-value>Resolve <code
   <ol id=ol8>
    <li>If <code title="height!!resolved">height</code> is ‘<code
     class=css>auto</code>’, set <code>height = width * (initial-height /
-    initial-width)</code>
+    initial-width)</code>, or <code>height = initial-height</code> if <code
+    class=index id=initial-width0 title="width!!initial">initial-width</code>
+    is 0.
   </ol>
 
   <h2 id=media-queries><span class=secno>7. </span>Media Queries</h2>
@@ -2263,7 +2269,8 @@ <h2 class=no-num id=index>Index</h2>
    <li>height, <a href="#height"
     title="section 5.4."><strong>5.4.</strong></a>
     <ul>
-     <li>initial, <a href="#initial-height" title="section 6.1.">6.1.</a>
+     <li>initial, <a href="#initial-height" title="section 6.1.">6.1.</a>, <a
+      href="#initial-height0" title="section ??">??</a>
 
      <li>resolved, <a href="#height0" title="section 6.1.">6.1.</a>
 
@@ -2336,7 +2343,8 @@ <h2 class=no-num id=index>Index</h2>
    <li>width, <a href="#width" title="section 5.2."><strong>5.2.</strong></a>
 
     <ul>
-     <li>initial, <a href="#initial-width" title="section 6.1.">6.1.</a>
+     <li>initial, <a href="#initial-width" title="section 6.1.">6.1.</a>, <a
+      href="#initial-width0" title="section ??">??</a>
 
      <li>resolved, <a href="#width0" title="section 6.1.">6.1.</a>
 

css-device-adapt/Overview.src.html

@@ -354,14 +354,14 @@ <h3>The
 
       <dt><var>&lt;length&gt;</var></dt>
       <dd>
-	<p>A positive absolute or relative length.</p>
+	<p>A non-negative absolute or relative length.</p>
       </dd>
 
       <dt><var>&lt;percentage&gt;</var></dt>
       <dd>
 	<p>A percentage value relative to the width or height of the
 	  <span>initial viewport</span> at zoom factor 1.0,
-	  for horizontal and vertical lengths respectively. Must be positive.
+	  for horizontal and vertical lengths respectively. Must be non-negative.
 	</p>
       </dd>
     </dl>
@@ -577,7 +577,7 @@ <h3>The &lsquo;<code class="descriptor" title="zoom!!descriptor">zoom</code>&rsq
 
 	<tr>
 	  <td><em>Computed&nbsp;value:</em></td>
-	  <td>&lsquo;<code class="css" title="auto!!zoom">auto</code>&rsquo;, or a positive
+	  <td>&lsquo;<code class="css" title="auto!!zoom">auto</code>&rsquo;, or a non-negative
 	    number or percentage as specified.</td>
 	</tr>
       </tbody>
@@ -601,14 +601,14 @@ <h3>The &lsquo;<code class="descriptor" title="zoom!!descriptor">zoom</code>&rsq
 
       <dt><var>&lt;number&gt;</var></dt>
       <dd>
-        <p>A positive number used as a zoom factor. A factor of 1.0 means
+        <p>A non-negative number used as a zoom factor. A factor of 1.0 means
           that no zooming is done. Values larger than 1.0 gives a zoomed-in
           effect and values smaller than 1.0 a zoomed-out effect.</p>
       </dd>
 
       <dt><var>&lt;percentage&gt;</var></dt>
       <dd>
-        <p>A positive percentage value used as a zoom factor. A factor of
+        <p>A non-negative percentage value used as a zoom factor. A factor of
           100% means that no zooming is done. Values larger than 100% gives a
           zoomed-in effect and values smaller than 100% a zoomed-out effect.</p>
       </dd>
@@ -646,7 +646,7 @@ <h3>The &lsquo;<code class="descriptor">min-zoom</code>&rsquo; descriptor</h3>
 
 	<tr>
 	  <td><em>Computed&nbsp;value:</em></td>
-	  <td>&lsquo;<code class="css" title="auto!!min-zoom">auto</code>&rsquo;, or a positive
+	  <td>&lsquo;<code class="css" title="auto!!min-zoom">auto</code>&rsquo;, or a non-negative
 	    number or percentage as specified.</td>
 	</tr>
       </tbody>
@@ -673,12 +673,12 @@ <h3>The &lsquo;<code class="descriptor">min-zoom</code>&rsquo; descriptor</h3>
 
       <dt><var>&lt;number&gt;</var></dt>
       <dd>
-	<p>A positive number limiting the minimum value of the zoom factor.</p>
+	<p>A non-negative number limiting the minimum value of the zoom factor.</p>
       </dd>
 
       <dt><var>&lt;percentage&gt;</var></dt>
       <dd>
-	<p>A positive percentage limiting the minimum value of the zoom factor.</p>
+	<p>A non-negative percentage limiting the minimum value of the zoom factor.</p>
       </dd>
     </dl>
 
@@ -714,7 +714,7 @@ <h3>The &lsquo;<code class="descriptor">max-zoom</code>&rsquo; descriptor</h3>
 
 	<tr>
 	  <td><em>Computed&nbsp;value:</em></td>
-	  <td>&lsquo;<code class="css" title="auto!!max-zoom">auto</code>&rsquo;, or a positive
+	  <td>&lsquo;<code class="css" title="auto!!max-zoom">auto</code>&rsquo;, or a non-negative
 	    number or percentage as specified.</td>
 	</tr>
       </tbody>
@@ -741,12 +741,12 @@ <h3>The &lsquo;<code class="descriptor">max-zoom</code>&rsquo; descriptor</h3>
 
       <dt><var>&lt;number&gt;</var></dt>
       <dd>
-	<p>A positive number limiting the maximum value of the zoom factor.</p>
+	<p>A non-negative number limiting the maximum value of the zoom factor.</p>
       </dd>
 
       <dt><var>&lt;percentage&gt;</var></dt>
       <dd>
-	<p>A positive percentage limiting the maximum value of the zoom factor.</p>
+	<p>A non-negative percentage limiting the maximum value of the zoom factor.</p>
       </dd>
     </dl>
 
@@ -975,7 +975,8 @@ <h4 class="no-num no-toc">Resolve <code title="width!!resolved">width</code>
 
       <li>If <code title="width!!resolved">width</code> is
 	&lsquo;<code class="css">auto</code>&rsquo;, set <code>width = height *
-	(initial-width / initial-height)</code></li>
+	(initial-width / initial-height)</code>, or <code>width = initial-width</code>
+	if <code class="index" title="height!!initial">initial-height</code> is 0.</li>
     </ol>
 
     <h4 class="no-num no-toc">Resolve <code title="height!!resolved">height</code>
@@ -984,7 +985,8 @@ <h4 class="no-num no-toc">Resolve <code title="height!!resolved">height</code>
     <ol id="ol8">
       <li>If <code title="height!!resolved">height</code> is
 	&lsquo;<code class="css">auto</code>&rsquo;, set <code>height = width *
-	(initial-height / initial-width)</code></li>
+	(initial-height / initial-width)</code>, or <code>height = initial-height</code>
+	if <code class="index" title="width!!initial">initial-width</code> is 0.</li>
     </ol>