[css-flexbox] Use synthesized border-box baseline for flex items without a natural baseline in the right axis. <w3c#373> per WG resolution <https://lists.w3.org/Archives/Public/www-style/2016Sep/0000.html>

Author: fantasai

css-flexbox/Overview.bs

@@ -2007,16 +2007,14 @@ Cross-axis Alignment: the 'align-items' and 'align-self' properties</h3>
 
 		<dt><dfn>baseline</dfn>
 		<dd>
-			If the <a>flex item</a> has no <a>natural baselines</a> in its <a>main axis</a>,
-			this value is identical to ''align-self/flex-start''.
-
-			Otherwise,
-			it <dfn dfn id='baseline-participation'>participates in baseline alignment</dfn>:
+			The <a>flex item</a> <dfn dfn id='baseline-participation'>participates in baseline alignment</dfn>:
 			all participating <a>flex items</a> on the line
 			are aligned such that their baselines align,
 			and the item with the largest distance between its baseline and its <a>cross-start</a> margin edge
 			is placed flush against the <a>cross-start</a> edge of the line.
-
+			If the item does not have a baseline in the necessary axis,
+			then one is <a lt="synthesize baseline">synthesized</a>
+			from the <a>flex item</a>’s border box.
 
 		<dt><dfn>stretch</dfn>
 		<dd>
@@ -2165,6 +2163,10 @@ Flex Container Baselines</h3>
 		    lt="main-axis baseline set|first main-axis baseline set|last main-axis baseline set">
 		    main-axis baseline set</dfn>
 		<dd>
+			When the <a>inline axis</a> of the <a>flex container</a>
+			matches its <a>main axis</a>,
+			its baselines are determined as follows:
+
 			1. If any of the <a>flex items</a> on the flex container's first/last <a>flex line</a>
 				<a href="#baseline-participation">participate in baseline alignment</a>,
 				the flex container's first/last <a>main-axis baseline set</a>
@@ -2181,7 +2183,7 @@ Flex Container Baselines</h3>
 			3. Otherwise, the flex container has no natural first/last main-axis <a>baseline set</a>,
 				and a synthesized first/last <a>baseline set</a>, if needed,
 				is <a lt="synthesize baselines">synthesized</a>
-				from the first/last item's content box,
+				from the first/last item's border box,
 				or, failing that, from the flex container's content box.
 
 				<!--
@@ -2195,6 +2197,10 @@ Flex Container Baselines</h3>
 			lt="cross-axis baseline set|first cross-axis baseline set|last cross-axis baseline set">
 			cross-axis baseline set</dfn>
 		<dd>
+			When the <a>inline axis</a> of the <a>flex container</a>
+			matches its <a>cross axis</a>,
+			its baselines are determined as follows:
+
 			1. If the flex container has at least one <a>flex item</a>,
 				and its first/last <a>flex item</a> has a first/last <a>baseline set</a>
 				parallel to the flex container's <a>cross axis</a>,
@@ -2204,7 +2210,7 @@ Flex Container Baselines</h3>
 			2. Otherwise, the flex container has no natural cross-axis <a>baseline set</a>,
 				and a synthesized first/last <a>baseline set</a>, if needed,
 				is <a lt="synthesize baselines">synthesized</a>
-				from the first/last item's content box,
+				from the first/last item's border box,
 				or, failing that, from the flex container's content box.
 	</dl>
 
@@ -3370,6 +3376,22 @@ Boris Zbarsky.
 
 	This section documents the changes since previous publications.
 
+<h3 id="changes-20160301">
+Changes since the 26 May 2016 CR</h3>
+
+http://www.w3.org/TR/2016/CR-css-flexbox-1-20160526/
+
+	A <a href="https://drafts.csswg.org/css-flexbox-1/issues-cr-20160526">Disposition of Comments</a> is also available.
+
+<h4 id="change-201603-substantive">
+Substantive Changes and Bugfixes</h4>
+
+	<ul>
+		<li id="change-2016-baseline-alignment">
+		Change <a>flex items</a> in orthogonal flows and <a>flex items<a> without a baseline
+		to both synthesize their alignment baseline from the <a>flex item</a>’s border box.
+	</ul>
+
 <h3 id="changes-20160301">
 Changes since the 1 March 2016 CR</h3>