change the error handling rules slightly

Author: annevk

css3-mediaqueries/Overview.html

@@ -638,39 +638,41 @@ <h3 id=error-handling><span class=secno>3.1. </span>Error Handling</h3>
      media query clause.</p>
 
    <li>
-    <p><strong>Unknown media features.</strong> User agents are to ignore a
-     media query when one of the specified media features is unknown.</p>
+    <p><strong>Unknown media features.</strong> User agents are to represent
+     a media query as "<code>not all</code>" when one of the specified media
+     features is not known.</p>
 
     <div class=example>
      <pre><span class=html-example>&lt;link rel="stylesheet" media="screen and (max-weight: 3kg) and (color), (color)" href="example.css" /&gt;</span></pre>
 
-     <p>In this example, the first media query is rejected due to an unknown
-      media feature and unknown value, but the second media query is
-      evaluated as if the first had not been specified.</p>
+     <p>In this example, the first media query will be represented as
+      "<code>not all</code>" and evaluate to false and the second media query
+      is evaluated as if the first had not been specified, effectively.</p>
     </div>
 
     <div class=example>
      <pre>@media (min-orientation:portrait) { ... }</pre>
 
-     <p>Is dropped because the &lsquo;<code
+     <p>Is represented as "<code>not all</code>" because the &lsquo;<code
       class=css>orientation</code>&rsquo; feature does not accept the
-      &lsquo;<code class=css>min-</code>&rsquo; prefix.
+      &lsquo;<code class=css>min-</code>&rsquo; prefix.</p>
     </div>
 
    <li>
     <p><strong>Unknown media feature values.</strong> As with unknown media
-     features, user agents are to ignore a media query when one of the
-     specified media feature values is unknown.</p>
+     features, user agents are to represent a media query as "<code>not
+     all</code>" when one of the specified media feature values is not known.</p>
 
     <div class=example>
      <p>The media query <code>(color:20example)</code> specifies an unknown
       value for the &lsquo;<code class=css>color</code>&rsquo; media feature
-      and is therefore ignored.</p>
+      and is therefore represented as "<code>not all</code>".</p>
     </div>
 
     <div class=example>
-     <p>This media query is invalid because negative lengths are not allowed
-      for the &lsquo;<code class=css>width</code>&rsquo; media feature:
+     <p>This media query is represented as "<code>not all</code>" because
+      negative lengths are not allowed for the &lsquo;<code
+      class=css>width</code>&rsquo; media feature:</p>
 
      <pre>@media (min-width: -100px) { ... }</pre>
     </div>
@@ -681,8 +683,9 @@ <h3 id=error-handling><span class=secno>3.1. </span>Error Handling</h3>
      until the end of the media query, while observing <a
      href="http://www.w3.org/TR/CSS21/syndata.html#block">the rules for
      matching pairs</a> of (), [], {}, "", and '', and correctly handling
-     escapes. Media queries with unexpected tokens are ignored. <a
-     href="#CSS21" rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>
+     escapes. Media queries with unexpected tokens are represented as
+     "<code>not all</code>". <a href="#CSS21"
+     rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>
 
     <div class=example>
      <pre>@media (example, all,), speech { /* only applicable to speech devices */ }
@@ -697,18 +700,6 @@ <h3 id=error-handling><span class=secno>3.1. </span>Error Handling</h3>
      <pre>@media all and(color) { ... }</pre>
     </div>
 
-    <p>When all media queries in a media query list are ignored it is the
-     same as if "<code>not all</code>" was specified.</p>
-
-    <div class=example>
-     <p>The following lists of media queries would all end up as "<code>not
-      all</code>":</p>
-
-     <pre>@media test, @test { ... }
-@media example { ... }
-@media screen and (min-example), example { ...}</pre>
-    </div>
-
     <p>Media queries are expected to follow the error handling rules of the
      host language as well.</p>
 

css3-mediaqueries/Overview.src.html

@@ -493,37 +493,40 @@ <h3>Error Handling</h3>
   media query clause.</p>
 
  <li>
-  <p><strong>Unknown media features.</strong> User agents are to ignore a
-  media query when one of the specified media features is unknown.</p>
+  <p><strong>Unknown media features.</strong> User agents are to represent a
+  media query as "<code>not all</code>" when one of the specified media
+  features is not known.</p>
 
   <div class="example">
    <pre><span class="html-example">&lt;link rel="stylesheet" media="screen and (max-weight: 3kg) and (color), (color)" href="example.css" /&gt;</span></pre>
 
-   <p>In this example, the first media query is rejected due to an unknown
-   media feature and unknown value, but the second media query is evaluated
-   as if the first had not been specified.</p>
+   <p>In this example, the first media query will be represented as
+   "<code>not all</code>" and evaluate to false and the second media query
+   is evaluated as if the first had not been specified, effectively.</p>
   </div>
 
   <div class="example">
    <pre>@media (min-orientation:portrait) { ... }</pre>
 
-   <p>Is dropped because the ''orientation'' feature does not accept the
-   ''min-'' prefix.
+   <p>Is represented as "<code>not all</code>" because the ''orientation''
+   feature does not accept the ''min-'' prefix.</p>
   </div>
 
  <li>
   <p><strong>Unknown media feature values.</strong> As with unknown media
-  features, user agents are to ignore a media query when one of the
-  specified media feature values is unknown.</p>
+  features, user agents are to represent a media query as
+  "<code>not all</code>" when one of the specified media feature values is
+  not known.</p>
 
   <div class="example">
    <p>The media query <code>(color:20example)</code> specifies an unknown
-   value for the ''color'' media feature and is therefore ignored.</p>
+   value for the ''color'' media feature and is therefore represented as
+   "<code>not all</code>".</p>
   </div>
 
   <div class="example">
-   <p>This media query is invalid because negative lengths are not allowed
-   for the ''width'' media feature:
+   <p>This media query is represented as "<code>not all</code>" because
+   negative lengths are not allowed for the ''width'' media feature:</p>
 
    <pre>@media (min-width: -100px) { ... }</pre>
   </div>
@@ -534,7 +537,8 @@ <h3>Error Handling</h3>
   the end of the media query, while observing
   <a href="http://www.w3.org/TR/CSS21/syndata.html#block">the rules for
   matching pairs</a> of (), [], {}, "", and &#39;&#39;, and correctly handling
-  escapes. Media queries with unexpected tokens are ignored. [[!CSS21]]
+  escapes. Media queries with unexpected tokens are represented as
+  "<code>not all</code>". [[!CSS21]]
 
   <div class="example">
    <pre>@media (example, all,), speech { /* only applicable to speech devices */ }
@@ -548,18 +552,6 @@ <h3>Error Handling</h3>
    <pre>@media all and(color) { ... }</pre>
   </div>
 
-  <p>When all media queries in a media query list are ignored it is the same
-  as if "<code>not all</code>" was specified.</p>
-
-  <div class="example">
-   <p>The following lists of media queries would all end up as "<code>not
-   all</code>":</p>
-
-   <pre>@media test, @test { ... }
-@media example { ... }
-@media screen and (min-example), example { ...}</pre>
-  </div>
-
   <p>Media queries are expected to follow the error handling rules of the
   host language as well.</p>