[css-ruby-1] Update Changes section

Author: xfq

css-ruby-1/Overview.bs

@@ -1557,11 +1557,97 @@ Acknowledgments</h2>
 <h2 class="no-num" id="changes">
 Changes</h2>
 
-	<p>The following major changes have been made since the previous Working Draft:
+This section documents the changes since previous publications.
+
+<h3 id="changes-20140805">
+Changes since the 5 August 2014 WD</h3>
+
+<ul>
+	<li>Harmonize ininification with the <a href="https://www.w3.org/TR/css-display-3/">CSS Display Module</a>.
+	<li>Allow UA to shift ruby/emphasis marks if they conflict with underlines/overlines.
+	<li>Disable autohiding when the computed value of 'ruby-merge' is ''collapse''.
+	<li>Tweak the <a href="#default-stylesheet">default style sheet</a>.
+	<li>Add section on <a href="#ruby-text-decoration">text decoration</a>.
+	<li>Defer the <css>right</css> and <css>left</css> values of 'ruby-position' to the next level.
+	<li>Change ruby pairing rules to only operate on anonymous annotations (i.e. content directly contained by an <{rtc}>).
+</ul>
+
+<h3 id="changes-20130919">
+Changes since the 19 September 2013 WD</h3>
+
 	<ul>
-		<li>Rewrote anonymous box generation rules and white space handling rules,
+		<li>Rewrite anonymous box generation rules and white space handling rules,
 		defined specialized pairing of anonymous white space boxes.
-		<li>Took nested ruby handling out of pairing.
+		<li>Take nested ruby handling out of pairing.
 		(Will be handling it via sizing/layout.)
-		<li>Defined bidi layout of ruby structures.
+		<li>Define bidi layout of ruby structures.
 	</ul>
+
+<h3 id="changes-20110630">
+		Changes since the 30 June 2011 WD</h3>
+
+		<dl>
+				<dt>Remove 'ruby-span' and mentions of
+				 <code>rbspan</code>.
+
+				<dd> Explicit spanning is not used in HTML ruby in favor of implicit
+				 spanning. This can't handle some pathological double-sided spanning
+				 cases, but there seems to be no requirement for these at the moment. (For
+				 implementations that support full complex XHTML Ruby, they can imply
+				 spanning from the markup the same magic way that we handle cell spanning
+				 from tables. It doesn't seem necessary to include controls this in Level
+				 1.)
+
+				<dt>Defer 'ruby-overhang' and <code>ruby-align: line-end</code> to Level 2.
+
+				<dd> It's somewhat complicated, advanced feature. Proposal is to make this
+				 behavior UA-defined and provide some examples of acceptable options.
+
+				<dt>Close issue requesting <code>display: rp</code>: use
+				 <code>display: none</code>.
+
+				<dd> The Internationalization WG added an issue requesting a display value
+				 for <{rp}> elements. They're supposed to be hidden when <{ruby}> is
+				 displayed as ruby. But this is easily accomplished already with <code>display: none</code>.
+
+				<dt>Change 'ruby-position' values to match 'text-emphasis-position'.
+
+				<dd> Other than ''inter-character'', which we
+				 need to keep, it makes more sense to align ruby positions with 'text-emphasis-position', which can correctly
+				 handle various combinations of horizontal/vertical preferences.
+
+				<dt>Remove unused values of 'ruby-align'.
+
+				<dd> <css>left</css>, <css>right</css>, and <css>end</css> are not needed.
+
+				<dt>Replace <css>auto</css>, <css>distribute-letter</css>, and <css>distribute-space</css> from 'ruby-align' with ''space-between'' and ''space-around''.
+
+				<dd> The <css>auto</css> value relied on inspecting
+				 content to determine behavior; this can be avoided by just using ''space-around'' with standard justification rules (which allow spacing between CJK but not between Latin).
+				 Replaced <css>distribute-letter</css> and <css>distribute-space</css> with ''space-between'' and ''space-around'' for consistency with distribution keywords in [[CSS3-FLEXBOX-1]] and [[CSS-ALIGN-3]] and to avoid any links to the definition of <code>text-justify: distribute</code>.
+
+				<dt>Added 'ruby-merge' property to control jukugo rendering.
+
+				<dd> This is a stylistic effect, not a structural one; the previous model
+				 assumed that it was structural and suggested handling it by changing
+				 markup. :(
+
+				<dt>Remove <css>inline</css> from 'ruby-position'.
+
+				<dd> This is do-able via <code>display: inline</code> on
+				 all the ruby-related elements, see <a href="#default-inline">Appendix A</a>.
+
+				<dt>Added <a href="#default-stylesheet">Default Style</a> rules
+
+				<dd> As requested by Internationalization WG.
+
+				<dt>Wrote anonymous box generation rules
+
+				<dd> And defined pairing of bases and annotations. Should now handle all
+				 the crazy proposed permutations of HTML ruby markup.
+
+				<dt>Defined layout of ruby
+
+				<dd> Defined in detail space distribution, white space handling, line
+				 breaking, line stacking, etc. Open issue left for bidi.
+			 </dl>