From 4b0fe579ffd052eb0b435d72777062b90efbdb7d Mon Sep 17 00:00:00 2001
From: Florian Rivoal <git@florian.rivoal.net>
Date: Thu, 21 Dec 2023 13:01:24 +0900
Subject: [PATCH] [css-text] Change line-end behavior of text-spacing-trim:
 space-first

See #9736
---
 css-text-4/Overview.bs | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/css-text-4/Overview.bs b/css-text-4/Overview.bs
index 956f26256d7..3952c01ab90 100644
--- a/css-text-4/Overview.bs
+++ b/css-text-4/Overview.bs
@@ -10495,7 +10495,7 @@ CJK Punctuation Spacing: the 'text-spacing-trim' property</h3>
 			Set <a>fullwidth opening punctuation</a> with full-width glyphs (spaced)
 			on the first line the [=block container=]
 			and each line after a [=forced line break=].
-			Otherwise as ''trim-auto''.
+			Otherwise as ''text-spacing/normal''.
 
 			<wpt>
 				text-spacing-trim/text-spacing-trim-001.html
@@ -10539,6 +10539,15 @@ CJK Punctuation Spacing: the 'text-spacing-trim' property</h3>
 				to freely switch among the various spacing/indentation styles
 				without needing to alter the content.
 				See [[#japanese-start-edges]] for examples.
+
+				Additionally, the behavior at the end of lines is aligned
+				with the ''text-spacing-trim/normal'' and ''trim-start'' values
+				rather than ''text-spacing-trim/trim-auto'',
+				in that it only trims the glyphs
+				if they do not otherwise fit prior to justification.
+				While improving the typography in fewer cases,
+				it is closer to the legacy behavior of ''space-all''
+				which reduces compatibility concerns.
 			</details>
 
 		<dt><dfn>trim-start</dfn>
@@ -10597,11 +10606,10 @@ CJK Punctuation Spacing: the 'text-spacing-trim' property</h3>
 				<td>yes
 			<tr>
 				<th>''trim-start''
-				<td>only if would not fit
+				<td rowspan=2>only if would not fit
 			<tr>
 				<th>''space-first''
 				<td>yes except on the first line
-				<td>yes
 			<tr>
 				<th>''trim-all''
 				<td colspan=4>yes