[css3-fonts] remove auto value for font-size-adjust

Author: John Daggett

css-fonts/Fonts.html

@@ -115,15 +115,15 @@
 
    <h1>CSS Fonts Module Level 3</h1>
 
-   <h2 class="no-num no-toc" id=editors-draft-28-august-2013>Editor's Draft
-    28 August 2013</h2>
+   <h2 class="no-num no-toc" id=editors-draft-29-august-2013>Editor's Draft
+    29 August 2013</h2>
 
    <dl id=authors>
     <dt>This version:
 
     <dd><a
      href="http://dev.w3.org/csswg/css-fonts/">http://dev.w3.org/csswg/css-fonts/</a>
-     <!-- <dd><a href="http://www.w3.org/TR/2013/ED-css-fonts-3-20130828/">http://www.w3.org/TR/2013/ED-css-fonts-3-20130828/</a>  -->
+     <!-- <dd><a href="http://www.w3.org/TR/2013/ED-css-fonts-3-20130829/">http://www.w3.org/TR/2013/ED-css-fonts-3-20130829/</a>  -->
 
 
     <dt>Latest version:
@@ -1583,7 +1583,7 @@ <h3 id=font-size-prop><span class=secno>3.5 </span>Font size: the <a
   <h3 id=font-size-adjust-prop><span class=secno>3.6 </span>Relative sizing:
    the <a href="#propdef-font-size-adjust">font-size-adjust</a> property</h3>
 
-  <table class=propdef id=namefont-size-adjustvaluenone-auto-ltnum>
+  <table class=propdef id=namefont-size-adjustvaluenone-ltnumbergt>
    <tbody>
     <tr>
      <td>Name:
@@ -1595,8 +1595,6 @@ <h3 id=font-size-adjust-prop><span class=secno>3.6 </span>Relative sizing:
 
      <td><a href="#font-size-adjust-none-value"
       title="none!!font-size-adjust">none</a> | <a
-      href="#font-size-adjust-auto-value"
-      title="auto!!font-size-adjust">auto</a> | <a
       href="#aspect-ratio-value"><var>&lt;number&gt;</var></a>
 
     <tr>
@@ -1647,10 +1645,11 @@ <h3 id=font-size-adjust-prop><span class=secno>3.6 </span>Relative sizing:
 
   <p>In situations where font fallback occurs, fallback fonts may not share
    the same aspect ratio as the desired font family and will thus appear less
-   readable. The font-size-adjust property is a way to preserve the
-   readability of text when font fallback occurs. It does this by adjusting
-   the font-size so that the x-height is the same regardless of the font
-   used.
+   readable. The ‘<a href="#propdef-font-size-adjust"><code
+   class=property>font-size-adjust</code></a>’ property is a way to
+   preserve the readability of text when font fallback occurs. It does this
+   by adjusting the font-size so that the x-height is the same regardless of
+   the font used.
 
   <div class=example>
    <p>The style defined below defines Verdana as the desired font family, but
@@ -1674,14 +1673,17 @@ <h3 id=font-size-adjust-prop><span class=secno>3.6 </span>Relative sizing:
    font-size value is used across cells within each row and red lines are
    included to show the differences in x-height. In the upper half each row
    is rendered in the same font-size value. The same is true for the lower
-   half but in this half the font-size-adjust property is also set so that
+   half but in this half the ‘<a href="#propdef-font-size-adjust"><code
+   class=property>font-size-adjust</code></a>’ property is also set so that
    the actual font size is adjusted to preserve the x-height across each row.
    Note how small text remains relatively legible across each row in the
    lower half.
 
-  <div class=figure><img alt="text with and without font-size-adjust"
+  <div class=figure><img alt="text with and without 'font-size-adjust'"
    src=fontsizeadjust.png>
-   <p class=caption>Text with and without the use of font-size-adjust
+   <p class=caption>Text with and without the use of ‘<a
+    href="#propdef-font-size-adjust"><code
+    class=property>font-size-adjust</code></a>’
   </div>
 
   <p>This property allows authors to specify an <a
@@ -1695,25 +1697,6 @@ <h3 id=font-size-adjust-prop><span class=secno>3.6 </span>Relative sizing:
 
    <dd>Do not preserve the font's x-height.
 
-   <dt><dfn id=font-size-adjust-auto-value
-    title="auto!!font-size-adjust">auto</dfn>
-
-   <dd>Behaves just like &lt;number>, except the number used is the <a
-    href="#aspect-value"><i>aspect value</i></a> calculated by user agents
-    for the first font in the list of fonts defined for the initial value of
-    the <a href="#propdef-font-family" title="font-family!!property">‘<code
-    class=property>font-family</code>’</a> property. Effectively this is
-    the default font used for basic Latin text when <a
-    href="#propdef-font-family" title="font-family!!property">‘<code
-    class=property>font-family</code>’</a> is not otherwise specified. It
-    does not vary based on document content and it is not calculated based on
-    the computed value of <a href="#propdef-font-family"
-    title="font-family!!property">‘<code
-    class=property>font-family</code>’</a> for a given element.
-    <p class=note>Authors can use this value to specify that font size should
-     be normalized across fonts based on the x-height without the need to
-     specify the aspect value explicitly.</p>
-
    <dt><dfn id=aspect-ratio-value><var>&lt;number&gt;</var></dfn>
 
    <dd>Specifies the <a href="#aspect-value"><i>aspect value</i></a> used in
@@ -1724,7 +1707,7 @@ <h3 id=font-size-adjust-prop><span class=secno>3.6 </span>Relative sizing:
     <p>where:</p>
 
     <pre>s  =  font-size value
-a  =  <a href="#aspect-value"><i>aspect value</i></a> as specified by the font-size-adjust property
+a  =  <a href="#aspect-value"><i>aspect value</i></a> as specified by the 'font-size-adjust' property
 a' =  <a href="#aspect-value"><i>aspect value</i></a> of actual font
 c  =  adjusted font-size to use
 </pre>
@@ -1736,44 +1719,59 @@ <h3 id=font-size-adjust-prop><span class=secno>3.6 </span>Relative sizing:
      effectively 1 for the first font and no adjustment occurs. If the value
      is specified inaccurately, text rendered using the first font in the
      family list will display differently in older user agents that don't
-     support font-size-adjust.</p>
+     support ‘<a href="#propdef-font-size-adjust"><code
+     class=property>font-size-adjust</code></a>’.</p>
   </dl>
 
   <p>The value of ‘<a href="#propdef-font-size-adjust"><code
-   class=property>font-size-adjust</code></a>’ affects the size of relative
-   units that are based on font metrics of the <a
-   href="#first-available-font"><i>first available font</i></a> such as
-   <code>ex</code> and <code>ch</code> but does not affect the size of
-   <code>em</code> units.
-
-  <p class=note>In CSS, authors typically specify <a
-   href="http://www.w3.org/TR/CSS2/visudet.html#propdef-line-height">‘<code
-   class=property>line-height</code>’</a> using <a
-   href="http://dev.w3.org/csswg/css-values/#em-unit">‘<code
-   class=property>em</code>’</a> units so that the <a
+   class=property>font-size-adjust</code></a>’ affects the used value of
+   ‘<a href="#propdef-font-size"><code
+   class=property>font-size</code></a>’ but does not affect the computed
+   value. It affects the size of relative units that are based on font
+   metrics of the <a href="#first-available-font"><i>first available
+   font</i></a> such as <code>ex</code> and <code>ch</code> but does not
+   affect the size of <code>em</code> units. Since numeric values of <a
    href="http://www.w3.org/TR/CSS2/visudet.html#propdef-line-height">‘<code
-   class=property>line-height</code>’</a> is linked to the font size. Since
-   the ‘<a href="#propdef-font-size-adjust"><code
-   class=property>font-size-adjust</code></a>’ property affects the font
-   size used but does not affect the size of font relative units, authors
-   should take care setting the line height when ‘<a
+   class=property>line-height</code>’</a> refer to the computed size of
+   ‘<a href="#propdef-font-size"><code
+   class=property>font-size</code></a>’, ‘<a
    href="#propdef-font-size-adjust"><code
+   class=property>font-size-adjust</code></a>’ does not affect the used
+   value of <a
+   href="http://www.w3.org/TR/CSS2/visudet.html#propdef-line-height">‘<code
+   class=property>line-height</code>’</a>.
+
+  <p class=note>In CSS, authors often specify <a
+   href="http://www.w3.org/TR/CSS2/visudet.html#propdef-line-height">‘<code
+   class=property>line-height</code>’</a> as a multiple of the ‘<a
+   href="#propdef-font-size"><code class=property>font-size</code></a>’.
+   Since the ‘<a href="#propdef-font-size-adjust"><code
+   class=property>font-size-adjust</code></a>’ property affects the used
+   value of ‘<a href="#propdef-font-size"><code
+   class=property>font-size</code></a>’, authors should take care setting
+   the line height when ‘<a href="#propdef-font-size-adjust"><code
    class=property>font-size-adjust</code></a>’ is used. Setting the line
-   height too tightly could result in overlapping lines of text in this
+   height too tightly can result in overlapping lines of text in this
    situation.
 
   <p>Authors can calculate the <a href="#aspect-value"><i>aspect
    value</i></a> for a given font by comparing spans with the same content
-   but different font-size-adjust properties. If the same font-size is used,
-   the spans will match when the font-size-adjust value is accurate for the
+   but different ‘<a href="#propdef-font-size-adjust"><code
+   class=property>font-size-adjust</code></a>’ properties. If the same
+   font-size is used, the spans will match when the ‘<a
+   href="#propdef-font-size-adjust"><code
+   class=property>font-size-adjust</code></a>’ value is accurate for the
    given font.
 
   <div class=example>
    <p>Two spans with borders are used to determine the <a
-    href="#aspect-value"><i>aspect value</i></a> of a font. The font-size is
-    the same for both spans but the font-size-adjust property is specified
-    only for the right span. Starting with a value of 0.5, the aspect value
-    can be adjusted until the borders around the two letters line up.</p>
+    href="#aspect-value"><i>aspect value</i></a> of a font. The ‘<a
+    href="#propdef-font-size"><code class=property>font-size</code></a>’ is
+    the same for both spans but the ‘<a
+    href="#propdef-font-size-adjust"><code
+    class=property>font-size-adjust</code></a>’ property is specified only
+    for the right span. Starting with a value of 0.5, the aspect value can be
+    adjusted until the borders around the two letters line up.</p>
 
    <pre>p {
     font-family: Futura;
@@ -5930,11 +5928,15 @@ <h3 class=no-num id=recent-changes> Changes from the <a
 
    <li>revised wording of font fetching algorithm
 
-   <li>clarify meaning of <a href="#font-size-adjust-auto-value"
-    title="auto!!font-size-adjust">‘<code class=property>auto</code>’</a>
-    value for ‘<a href="#propdef-font-size-adjust"><code
+   <li>drop ‘<code class=property>auto</code>’ value for ‘<a
+    href="#propdef-font-size-adjust"><code
     class=property>font-size-adjust</code></a>’
 
+   <li>clarify effect of ‘<a href="#propdef-font-size-adjust"><code
+    class=property>font-size-adjust</code></a>’ on <a class=property
+    href="http://www.w3.org/TR/CSS2/visudet.html#propdef-line-height">‘<code
+    class=property>line-height</code>’</a>
+
    <li>allow user agents to synthesize OpenType <span class=tag>kern</span>
     feature
 
@@ -6453,9 +6455,6 @@ <h2 class=no-num id=index>Index</h2>
     <ul>
      <li>font-kerning, <a href="#font-kerning-auto-value" title="auto,
       font-kerning"><strong>6.3</strong></a>
-
-     <li>font-size-adjust, <a href="#font-size-adjust-auto-value"
-      title="auto, font-size-adjust"><strong>3.6</strong></a>
     </ul>
 
    <li>bold, <a href="#bold" title=bold><strong>3.2</strong></a>
@@ -6955,7 +6954,7 @@ <h2 class=no-num id=property-index>Property index</h2>
      <th><a class=property
       href="#propdef-font-size-adjust">font-size-adjust</a>
 
-     <td>none | auto | &lt;number&gt;
+     <td>none | &lt;number&gt;
 
      <td>none