[css-grid] Define the auto height of a grid in block flow.

Author: tabatkins

css-grid/Overview.bs

@@ -16,7 +16,7 @@ Former editor: <a href="mailto:alexmog@microsoft.com">Alex Mogilevsky</a>, Micro
 Former editor: <a href="mailto:pcupp@microsoft.com">Phil Cupp</a>, Microsoft Corporation
 !Issues list: <a href="https://www.w3.org/Bugs/Public/buglist.cgi?product=CSS&amp;component=Grid+Layout&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED">In Bugzilla</a>
 Abstract: This CSS module defines a two-dimensional grid-based layout system, optimized for user interface design. In the grid layout model, the children of a grid container can be positioned into arbitrary slots in a flexible or fixed predefined layout grid.
-Ignored Terms: containing block, <positive-integer>, <ident>, auto, grid-*-start, grid-*-end, flex factor, flex factors
+Ignored Terms: containing block, <positive-integer>, <ident>, auto, grid-*-start, grid-*-end, flex factor, flex factors, block formatting context
 Link Defaults: css21 (property) margin, css-align-3 (dfn) alignment container/alignment subject
 At Risk: the ''grid-template-rows/subgrid'' value of 'grid-template-columns' and 'grid-template-rows', and its component parts individually
 </pre>
@@ -2858,10 +2858,9 @@ Intrinsic Sizes</h3>
 
 	See [[!CSS3-SIZING]] for a definition of the terms in this section.
 
-<h3 id='auto-sizing'>
-Auto-Sizing Grid Containers</h3>
-
-
+	In a <a>block formatting context</a>,
+	a <a>grid container’s</a> ''auto'' block size
+	is its max-content block size.
 
 
 <h2 id='pagination'>

css-grid/Overview.html

@@ -215,8 +215,7 @@ <h2 class="no-num no-toc no-ref heading settled heading" id=contents><span class
 		<li><a href=#algo-flex-tracks><span class=secno>10.6</span> Process Flexible Tracks</a>
 			<ul class=toc>
 			<li><a href=#algo-find-fr-size><span class=secno>10.6.1</span> Find the Size of an <span class=css data-link-type=maybe title=fr>fr</span></a></ul>
-		<li><a href=#intrinsic-sizes><span class=secno>10.7</span> Intrinsic Sizes</a>
-		<li><a href=#auto-sizing><span class=secno>10.8</span> Auto-Sizing Grid Containers</a></ul>
+		<li><a href=#intrinsic-sizes><span class=secno>10.7</span> Intrinsic Sizes</a></ul>
 	<li><a href=#pagination><span class=secno>11</span> Fragmenting Grid Layout</a>
 	<li><a href=#acks><span class=secno></span> Acknowledgements</a>
 	<li><a href=#changes><span class=secno></span> Changes</a>
@@ -2834,10 +2833,9 @@ <h3 class="heading settled heading" data-level=10.7 id=intrinsic-sizes><span cla
 
 <p>	See <a data-biblio-type=normative data-link-type=biblio href=#css3-sizing title=css3-sizing>[CSS3-SIZING]</a> for a definition of the terms in this section.
 
-<h3 class="heading settled heading" data-level=10.8 id=auto-sizing><span class=secno>10.8 </span><span class=content>
-Auto-Sizing Grid Containers</span><a class=self-link href=#auto-sizing></a></h3>
-
-
+<p>	In a <a data-link-type=dfn title="block formatting context">block formatting context</a>,
+	a <a data-link-type=dfn href=#grid-container title="grid container’s">grid container’s</a> <a class=css data-link-type=maybe href=#valuedef-auto title=auto>auto</a> block size
+	is its max-content block size.
 
 
 <h2 class="heading settled heading" data-level=11 id=pagination><span class=secno>11 </span><span class=content>