[css-inline-3] Apply negative margins to descendants of inline boxes. #8182

Author: fantasai

css-inline-3/Overview.bs

@@ -223,7 +223,7 @@ Layout Within Line Boxes</h3>
 				For other [=inline boxes=]:
 				this is derived from their 'text-box-edge' metrics,
 				and includes any [=margin=]/[=border=]/[=padding=];
-				see [[#inline-height]]
+				see [[#inline-height]].
 		</ul>
 
 	3. <strong>Line Box Sizing:</strong>
@@ -1238,6 +1238,10 @@ Calculating the Logical Height Contributions (“Layout Bounds”) of Inline Box
 	the [=layout bounds=] are inflated
 	by the sum of the [=margin=], [=border=], and [=padding=]
 	on each side.
+	In order to allow negative [=margin=] values to have an actual effect,
+	negative [=margins=] are also accumulated onto
+	the layout bounds of any descendant [=inline boxes=]
+	participating in the same [=inline formatting context=].
 
 	In Quirks Mode [[!QUIRKS]],
 	any [=inline box=] [=box fragment|fragment=]
@@ -2975,6 +2979,17 @@ A.3: Synthesizing Baselines for Atomic Inlines</h3>
 <h2 class="no-num" id="changes">
 Changes</h2>
 
+	Changes since the
+	<a href="https://www.w3.org/TR/2023/WD-css-inline-3-20230401/">1 April 2023 Working Draft</a>:
+	<ul>
+		<li>Apply negative [=block-axis=] margins to descendants of [=inline boxes=]
+			when calculating their [=layout bounds=]
+			so that they can actually have the specified effect.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/8182">Issue 8182</a>)
+		<li>Corrected [=invisible line boxes=] to only account for [=inline-axis=] box decorations.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/9344">Issue 9344</a>)
+	</ul>
+
 	Changes since the
 	<a href="https://www.w3.org/TR/2022/WD-css-inline-3-20221114/">14 November 2022 Working Draft</a>:
 	<ul>