[css-text] L3/L4 sync

Author: fantasai

css-text-3/Overview.bs

@@ -2086,7 +2086,7 @@ Phase II: Trimming and Positioning</h4>
 			Otherwise, each [=preserved=] [=tab=] is rendered
 			as a horizontal shift that lines up
 			the start edge of the next glyph with the next [=tab stop=].
-			If this distance is less than 0.5<a value class=no-quote>ch</a>,
+			If this distance is less than ''0.5ch'',
 			then the subsequent [=tab stop=] is used instead.
 			<dfn lt="tab stop">Tab stops</dfn> occur at points
 			that are multiples of the [=tab size=]
@@ -3277,7 +3277,7 @@ Line Breaking Details</h3>
 		<li>
 			Preserved segment breaks, and--
 			regardless of the 'white-space' value--
-			any Unicode character with the the <code>BK</code> and <code>NL</code> line breaking class,
+			any Unicode character with the <code>BK</code> and <code>NL</code> line breaking class,
 			must be treated as forced line breaks.
 			[[!UAX14]]
 
@@ -6950,11 +6950,12 @@ Hanging Punctuation: the 'hanging-punctuation' property</h4>
 
 		<dt><dfn>first</dfn>
 		<dd>
-			An opening bracket or quote at the start
+			An opening bracket, quote, or ideographic space at the start
 			of the [=first formatted line=]
 			of an element [=hangs=].
 			This applies to all characters in the Unicode categories Ps, Pf, Pi
-			plus the ASCII quote marks U+0027 ' APOSTROPHE and U+0022 " QUOTATION MARK.
+			plus the ASCII quote marks U+0027 ' APOSTROPHE and U+0022 " QUOTATION MARK
+			and the IDEOGRAPHIC SPACE U+3000.
 
 			<wpt>
 			hanging-punctuation/hanging-punctuation-first-001.xht
@@ -8194,6 +8195,23 @@ Recent Changes</h3>
 	The following normative changes have been made since
 	the <a href="https://www.w3.org/TR/2020/CR-css-text-3-20201222/">December 2020 Candidate Recommendation</a>.
 
+	* Allow ''hanging-puctuation: first'' to hang U+300 IDEOGRAPHIC SPACE
+		in order to accommodate plaintext indentation habits.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/2462">Issue 2462</a>)
+		<blockquote>
+			<dl>
+				<dt>first
+				<dd>
+				An opening bracket<ins>,</ins><del> or</del> quote<ins>, or ideographic space</ins> at the start
+				of the [=first formatted line=]
+				of an element [=hangs=].
+				This applies to all characters in the Unicode categories Ps, Pf, Pi
+				plus the ASCII quote marks U+0027 ' APOSTROPHE and U+0022 " QUOTATION MARK
+				plus the ASCII quote marks U+0027 ' APOSTROPHE and U+0022 " QUOTATION MARK
+				<ins>and the IDEOGRAPHIC SPACE U+3000</ins>.
+			</dl>
+		</blockquote>
+
 	* Define that ''distribute'' computes to ''inter-character'', rather than merely behave the same;
 		allow ''text-justify/distribute'' to be implemented as a [=legacy value alias=],
 		since this is easier for some engines and does not matter for compatibility.

css-text-4/Overview.bs

@@ -580,9 +580,13 @@ Case Transforms: the 'text-transform' property</h3>
 	It has no effect on the underlying content,
 	and must not affect the content of a plain text copy &amp; paste operation.
 
-	Note: The 'text-transform' property only affects the presentation layer;
-	correct casing for semantic purposes is expected to be represented
-	in the source document.
+	<wpt>
+	text-transform/text-transform-upperlower-105.html
+	</wpt>
+
+	Advisement: Authors must not rely on 'text-transform' for semantic purposes;
+	rather the correct casing and semantics should be encoded
+	in the source document text and markup.
 
 	<wpt>
 	text-transform/text-transform-copy-paste-001-manual.html