Tweak the line-breaking calculations.

Author: tabatkins

css3-flexbox/Overview.html

@@ -1842,21 +1842,23 @@ <h2 id=layout-algorithm><span class=secno>7. </span> Flexbox Layout
 
        <dt>size doesn't rely on its contents
 
-       <dd>The maximum line length is main size of the flexbox's content box.
+       <dd>The maximum line length is main size of the flexbox's content box,
+        constrained by the min and max main size constraints of the flexbox.
 
        <dt>&lsquo;<code class=css>min-content</code>&rsquo;
 
        <dd>The maximum line length is the flexbox's minimum main size.
 
        <dt>&lsquo;<code class=css>max-content</code>&rsquo;
 
-       <dd>The maximum line length is the flexbox's maximum main size, or
-        infinity if it has no maximum main size.
+       <dd>The maximum line length is infinity, constrained by the main and
+        max main size constraints of the flexbox.
 
        <dt>&lsquo;<code class=css>fit-content</code>&rsquo;
 
-       <dd>Same as if the flexbox was sized as &lsquo;<code
-        class=css>fill-available</code>&rsquo;.
+       <dd>The maximum line length is the greater of the flexbox's main size
+        constraint and the smaller of the flexbox's maximum size constraint
+        and the available space.
       </dl>
 
      <li>Collect as many consecutive flexbox items as possible, starting from

css3-flexbox/Overview.src.html

@@ -903,16 +903,16 @@ <h2 id='layout-algorithm'>
 
 					<dt>
 						<dt>size doesn't rely on its contents</dt>
-						<dd>The maximum line length is main size of the flexbox's content box.</dd>
+						<dd>The maximum line length is main size of the flexbox's content box, constrained by the min and max main size constraints of the flexbox.</dd>
 
 						<dt>''min-content''</dt>
 						<dd>The maximum line length is the flexbox's minimum main size.</dd>
 
 						<dt>''max-content''</dt>
-						<dd>The maximum line length is the flexbox's maximum main size, or infinity if it has no maximum main size.</dd>
+						<dd>The maximum line length is infinity, constrained by the main and max main size constraints of the flexbox.</dd>
 
 						<dt>''fit-content''</dt>
-						<dd>Same as if the flexbox was sized as ''fill-available''.</dd>
+						<dd>The maximum line length is the greater of the flexbox's main size constraint and the smaller of the flexbox's maximum size constraint and the available space.</dd>
 					</dt>
 				</li>