[css-ruby] Improve description of Jukugo

See w3c#784

Author: frivoal

css-ruby-1/Overview.bs

@@ -1109,10 +1109,17 @@ Sharing Annotation Space: the 'ruby-merge' property</h3>
 				the space is shared in some way
 				to avoid imposing space between bases.
 
-				<div class="example">
-					One possible algorithm is described as “jukugo ruby” in [[JLREQ]].
+				<div class="note">
+					Note: This behavior is intended for compound words,
+					see <a href="https://www.w3.org/International/questions/qa-ruby#jukugo">“Jukugo Ruby” in “What is ruby?”</a>. [[QA-RUBY]]
 
-					Another, more simplified algorithm of “jukugo ruby” is
+					There are various conventions for rendering this type of ruby,
+					see <a href="https://www.w3.org/TR/simple-ruby/#placement-of-jukugo-ruby">Placement of Jukugo-ruby</a> in [[SIMPLE-RUBY]],
+					<a href="https://www.w3.org/TR/jlreq/#positioning_of_jukugoruby_with_respect_to_base_characters">Positioning of Jukugo-ruby</a> in [[JLREQ]],
+					and <cite>4.12.3(c) 熟語ルビの処理</cite> in [[JISX4051]]
+					for examples of varying complexity.
+
+					The simplest of these is
 					to render as ''separate'' if all ruby annotation boxes fit
 					within the advances of their corresponding base boxes,
 					and render as ''merge'' otherwise.
@@ -1843,3 +1850,16 @@ Changes since the 30 June 2011 WD</h3>
 			line breaking, line stacking, etc.
 			Open issue left for bidi.
 	</dl>
+
+
+
+<pre class=biblio>
+{
+	"QA-RUBY": {
+		"href": "https://www.w3.org/International/questions/qa-ruby",
+		"title": "What is ruby?",
+		"publisher": "W3C",
+		"author": "Richard Ishida"
+	}
+}
+</pre>