[css3-sizing] Add note clarifying that percentages resolved against intrinsic sizes compute to auto.

Author: tabatkins

css3-sizing/Overview.html

@@ -524,6 +524,16 @@ <h3 id=width-height-keywords><span class=secno>3.1. </span> New Keywords
   <p class=issue> If the measure is ‘<code class=css>auto</code>’, we
    could have min-content extent imply a max-content measure, and vice versa.
 
+  <p class=note> Note that percentages resolved against the intrinsic sizes
+   (‘<a href="#max-content"><code class=css>max-content</code></a>’,
+   ‘<a href="#min-content"><code class=css>min-content</code></a>’, ‘<a
+   href="#fit-content"><code class=css>fit-content</code></a>’, ‘<a
+   href="#repudiate-floats"><code class=css>repudiate-floats</code></a>’)
+   will compute to ‘<code class=css>auto</code>’, <a
+   href="http://www.w3.org/TR/CSS21/visudet.html#the-height-property">as
+   defined by CSS 2.1</a>. <a href="#CSS21"
+   rel=biblioentry>[CSS21]<!--{{!CSS21}}--></a>
+
   <h3 id=the-contain-floats-value><span class=secno>3.2. </span> Containing
    Floats</h3>
 

css3-sizing/Overview.src.html

@@ -305,6 +305,12 @@ <h3 id='width-height-keywords'>
 		we could have min-content extent imply a max-content measure,
 		and vice versa.
 
+	<p class='note'>
+		Note that percentages resolved against the intrinsic sizes 
+		(''max-content'', ''min-content'', ''fit-content'', ''repudiate-floats'')
+		will compute to ''auto'',
+		<a href="http://www.w3.org/TR/CSS21/visudet.html#the-height-property">as defined by CSS 2.1</a>. [[!CSS21]]
+
 <h3 id='the-contain-floats-value'>
 Containing Floats</h3>