[css-inline] add appendix on synthesizing missing baselines

Author: dauwhe

css-inline/Overview.bs

@@ -801,6 +801,33 @@ Floats always clear an initial letter when floated to the same side. When floate
 
 Issue: Is this the behavior we want? What if the float is on the same line as the initial letter?
 
+<h2 class="no-num" id="appendix-a">
+Appendix A: Synthesizing Baselines</h2>
+
+Some fonts may not contain the baseline information necessary to align properly as described above. 
+User agents should follow these steps in the absence of a necessary metric:
+
+<ol>
+
+<li>Measure the font. 
+
+<div class="issue">Describe in more detail. Should we document which characters in which scripts are useful, such as lowercase "o" to measure x-height?</div>
+</li>
+
+<li>Use a heuristic for the script. </li>
+
+<li>Use fallback values:
+
+<ol>
+
+  <li>x-height: .5em;</li>
+
+  <li>cap-height: .66em;</li>
+
+  <li>hanging baseline: .6em;</li>
+</ol>
+</li>
+
 
 <h2 class="no-num" id="ack">
 Acknowledgments</h2>
@@ -810,4 +837,4 @@ Eric A. Meyer and Michel Suignard.
 
 <p>In additions to the authors, this specification would not have been possible without the help from:
 
-<p>David Baron, John Daggett, Stephen Deach, Sujal Parikh, Grzegorz Zygmunt, Chris Wilson, David M Brown, Bobby Tung, Shinyu Murakami, David Hyatt, Sylvain Galineau, Alan Stearns, Ted O'Connor.
+<p>David Baron, John Daggett, Stephen Deach, Sujal Parikh, Grzegorz Zygmunt, Chris Wilson, David M Brown, Bobby Tung, Shinyu Murakami, David Hyatt, Sylvain Galineau, Alan Stearns, Ted O’Connor.

css-inline/Overview.html

@@ -90,7 +90,7 @@
    <h1 class="p-name no-ref" id="title">CSS Inline Layout Module Level 3</h1>
 
    <h2 class="no-num no-toc no-ref heading settled" id="subtitle"><span class="content">Editor’s Draft,
-    <time class="dt-updated" datetime="2015-08-27">27 August 2015</time></span></h2>
+    <time class="dt-updated" datetime="2015-09-01">1 September 2015</time></span></h2>
 
    <div data-fill-with="spec-metadata">
     <dl>
@@ -251,6 +251,8 @@ <h2 class="no-num no-toc no-ref heading settled" id="contents"><span class="cont
 Interaction with floats</span></a>
        </ul>
      </ul>
+    <li><a href="#appendix-a"><span class="secno"></span> <span class="content">
+Appendix A: Synthesizing Baselines</span></a>
     <li><a href="#ack"><span class="secno"></span> <span class="content">
 Acknowledgments</span></a>
     <li><a href="#conformance"><span class="secno"></span> <span class="content">
@@ -1445,21 +1447,59 @@ <h4 class="heading settled" data-level="2.10.3" id="initial-letter-floats"><span
    <p class="issue" id="issue-2ad0a0cb"><a class="self-link" href="#issue-2ad0a0cb"></a> Is this the behavior we want? What if the float is on the same line as the initial letter?</p>
 
 
+   <h2 class="no-num heading settled" id="appendix-a"><span class="content">
+Appendix A: Synthesizing Baselines</span><a class="self-link" href="#appendix-a"></a></h2>
 
-   <h2 class="no-num heading settled" id="ack"><span class="content">
+
+   <p>Some fonts may not contain the baseline information necessary to align properly as described above.
+User agents should follow these steps in the absence of a necessary metric:</p>
+
+
+   <ol>
+
+
+    <li>Measure the font. 
+
+
+     <div class="issue" id="issue-3d9f0fe7"><a class="self-link" href="#issue-3d9f0fe7"></a>Describe in more detail. Should we document which characters in which scripts are useful, such as lowercase "o" to measure x-height?</div>
+
+
+
+    <li>Use a heuristic for the script. 
+
+
+    <li>Use fallback values:
+
+
+     <ol>
+
+  
+      <li>x-height: .5em;
+
+  
+      <li>cap-height: .66em;
+
+  
+      <li>hanging baseline: .6em;
+</ol>
+
+
+
+
+    <h2 class="no-num heading settled" id="ack"><span class="content">
 Acknowledgments</span><a class="self-link" href="#ack"></a></h2>
 
 
-   <p>Special thanks goes to the initial authors,
+    <p>Special thanks goes to the initial authors,
 Eric A. Meyer and Michel Suignard.
 
 </p>
-   <p>In additions to the authors, this specification would not have been possible without the help from:
+    <p>In additions to the authors, this specification would not have been possible without the help from:
 
 </p>
-   <p>David Baron, John Daggett, Stephen Deach, Sujal Parikh, Grzegorz Zygmunt, Chris Wilson, David M Brown, Bobby Tung, Shinyu Murakami, David Hyatt, Sylvain Galineau, Alan Stearns, Ted O’Connor.
+    <p>David Baron, John Daggett, Stephen Deach, Sujal Parikh, Grzegorz Zygmunt, Chris Wilson, David M Brown, Bobby Tung, Shinyu Murakami, David Hyatt, Sylvain Galineau, Alan Stearns, Ted O’Connor.
 
-</p></main>
+</p></ol></main>
 
   <h2 class="no-ref no-num heading settled" id="conformance"><span class="content">
 Conformance</span><a class="self-link" href="#conformance"></a></h2>
@@ -1894,5 +1934,6 @@ <h2 class="no-num heading settled" id="issues-index"><span class="content">Issue
    <div class="issue"> Edit figure to show how auto behaves in varying contexts<a href="#issue-c4ff3304"> ↵ </a></div>
    <div class="issue"> Handle glyph ink above cap height of font.<a href="#issue-f77cbeb9"> ↵ </a></div>
    <div class="issue"> Is this the behavior we want? What if the float is on the same line as the initial letter?<a href="#issue-2ad0a0cb"> ↵ </a></div>
+   <div class="issue">Describe in more detail. Should we document which characters in which scripts are useful, such as lowercase "o" to measure x-height?<a href="#issue-3d9f0fe7"> ↵ </a></div>
   </div></body>
 </html>