[Tables] Fix baseline handling by skipping adjustments when cell has no inflow children

Ahmad-S792 · Ahmad Saleem · commit 46e34443b1ae · 2025-12-15T14:24:19.000-08:00
https://bugs.webkit.org/show_bug.cgi?id=298659 rdar://problem/160774504 Reviewed by Alan Baradlay. This patch aligns WebKit with Gecko / Firefox and Blink / Chromium. Inspired by: https://chromium.googlesource.com/chromium/src/+/ca5380c68d5805f2e7ae6914620723fed797685c According to Web Specification [1], the baseline of a table cell is the baseline of the first in-flow line box or table-row, whichever comes first. If none exist, the baseline falls back to the bottom content edge of the cell box. WebKit previously always attempted to adjust intrinsic padding during baseline alignment, even for cells containing only out-of-flow (OOF) children. However, the specification distinguishes between: - Baseline determination (always produced, falling back to content edge if needed) - Baseline alignment adjustments (only applied when in-flow children exist) This patch adds an in-flow child check in `applyStandard` to ensure that intrinsic padding adjustments are skipped for cells with only OOF children. In such cases, the baseline defaults to the content edge without applying any padding shift. The check uses `firstInFlowChild()` for efficiency, and the baseline computation is deferred until after this check to avoid unnecessary calculations when early-returning. This patch fixes WebKit's behavior and makes it consistent with other browsers and closer to the web specification. [1] https://www.w3.org/TR/CSS21/tables.html#height-layout * Source/WebCore/rendering/RenderTableCell.cpp: (WebCore::RenderTableCell::computeIntrinsicPadding): > Progression: * LayoutTests/TestExpectations: > Rebaselines: * LayoutTests/fast/table/table-insert-before-non-anonymous-block-expected.txt: * LayoutTests/platform/glib/fast/css/acid2-expected.txt: * LayoutTests/platform/glib/fast/css/acid2-pixel-expected.txt: * LayoutTests/platform/glib/fast/dynamic/insert-before-table-part-in-continuation-expected.txt: * LayoutTests/platform/glib/http/tests/misc/acid2-expected.txt: * LayoutTests/platform/glib/http/tests/misc/acid2-pixel-expected.txt: * LayoutTests/platform/ios/fast/css/acid2-expected.txt: * LayoutTests/platform/ios/fast/css/acid2-pixel-expected.txt: * LayoutTests/platform/ios/fast/dynamic/insert-before-table-part-in-continuation-expected.txt: * LayoutTests/platform/ios/http/tests/misc/acid2-expected.txt: * LayoutTests/platform/ios/http/tests/misc/acid2-pixel-expected.txt: * LayoutTests/platform/mac/fast/css/acid2-expected.txt: * LayoutTests/platform/mac/fast/css/acid2-pixel-expected.txt: * LayoutTests/platform/mac/fast/dynamic/insert-before-table-part-in-continuation-expected.txt: * LayoutTests/platform/mac/http/tests/misc/acid2-expected.txt: * LayoutTests/platform/mac/http/tests/misc/acid2-pixel-expected.txt: Canonical link: https://commits.webkit.org/304477@main
diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
@@ -6734,7 +6734,6 @@ imported/w3c/web-platform-tests/css/css-tables/height-distribution/percentage-si
 imported/w3c/web-platform-tests/css/css-tables/height-distribution/percentage-sizing-of-table-cell-children-006.html [ ImageOnlyFailure ]
 imported/w3c/web-platform-tests/css/css-tables/min-max-size-table-content-box.html [ ImageOnlyFailure ]
 imported/w3c/web-platform-tests/css/css-tables/rules-groups.html [ ImageOnlyFailure ]
-imported/w3c/web-platform-tests/css/css-tables/table-cell-baseline-static-position.html [ ImageOnlyFailure ]
 imported/w3c/web-platform-tests/css/css-tables/table-has-box-sizing-border-box-002.html [ ImageOnlyFailure ]
 imported/w3c/web-platform-tests/css/css-tables/tentative/paint/background-image-column-collapsed.html [ ImageOnlyFailure ]
 imported/w3c/web-platform-tests/css/css-tables/tentative/paint/background-image-column.html [ ImageOnlyFailure ]
diff --git a/LayoutTests/fast/table/table-insert-before-non-anonymous-block-expected.txt b/LayoutTests/fast/table/table-insert-before-non-anonymous-block-expected.txt
@@ -53,4 +53,4 @@ layer at (0,0) size 800x466
             RenderTableCell (anonymous) at (0,0) size 50x100 [r=0 c=0 rs=1 cs=1]
               RenderBlock {DIV} at (0,0) size 50x50 [bgcolor=#0000FF]
               RenderBlock {DIV} at (0,50) size 50x50 [bgcolor=#0000FF]
-            RenderTableCell {DIV} at (50,50) size 50x0 [bgcolor=#0000FF] [r=0 c=1 rs=1 cs=1]
+            RenderTableCell {DIV} at (50,0) size 50x0 [bgcolor=#0000FF] [r=0 c=1 rs=1 cs=1]
diff --git a/LayoutTests/platform/glib/fast/css/acid2-expected.txt b/LayoutTests/platform/glib/fast/css/acid2-expected.txt
@@ -33,10 +33,10 @@ layer at (36,2638) size 764x226
     RenderTable {UL} at (96,192) size 48x12 [bgcolor=#FF0000]
       RenderTableSection (anonymous) at (0,0) size 48x12
         RenderTableRow (anonymous) at (0,0) size 48x12
-          RenderTableCell {LI} at (0,12) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
+          RenderTableCell {LI} at (0,0) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
           RenderTableCell (anonymous) at (12,0) size 12x12 [r=0 c=1 rs=1 cs=1]
             RenderTable {LI} at (0,0) size 12x12 [bgcolor=#000000]
-          RenderTableCell {LI} at (24,12) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
+          RenderTableCell {LI} at (24,0) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
           RenderTableCell (anonymous) at (36,0) size 12x12 [r=0 c=3 rs=1 cs=1]
             RenderListItem {LI} at (0,0) size 12x12 [bgcolor=#000000]
 layer at (48,2842) size 740x10 scrollHeight 276
diff --git a/LayoutTests/platform/glib/fast/css/acid2-pixel-expected.txt b/LayoutTests/platform/glib/fast/css/acid2-pixel-expected.txt
@@ -33,10 +33,10 @@ layer at (36,72) size 764x226
     RenderTable {UL} at (96,192) size 48x12 [bgcolor=#FF0000]
       RenderTableSection (anonymous) at (0,0) size 48x12
         RenderTableRow (anonymous) at (0,0) size 48x12
-          RenderTableCell {LI} at (0,12) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
+          RenderTableCell {LI} at (0,0) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
           RenderTableCell (anonymous) at (12,0) size 12x12 [r=0 c=1 rs=1 cs=1]
             RenderTable {LI} at (0,0) size 12x12 [bgcolor=#000000]
-          RenderTableCell {LI} at (24,12) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
+          RenderTableCell {LI} at (24,0) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
           RenderTableCell (anonymous) at (36,0) size 12x12 [r=0 c=3 rs=1 cs=1]
             RenderListItem {LI} at (0,0) size 12x12 [bgcolor=#000000]
 layer at (48,276) size 740x10 scrollHeight 276
diff --git a/LayoutTests/platform/glib/fast/dynamic/insert-before-table-part-in-continuation-expected.txt b/LayoutTests/platform/glib/fast/dynamic/insert-before-table-part-in-continuation-expected.txt
@@ -40,7 +40,7 @@ layer at (0,0) size 800x600
           RenderTable at (39,0) size 104x18
             RenderTableSection (anonymous) at (0,0) size 103x18
               RenderTableRow (anonymous) at (0,0) size 103x18
-                RenderTableCell {TD} at (0,14) size 0x0 [r=0 c=0 rs=1 cs=1]
+                RenderTableCell {TD} at (0,0) size 0x0 [r=0 c=0 rs=1 cs=1]
                 RenderTableCell {DIV} at (0,0) size 103x18 [r=0 c=1 rs=1 cs=1]
                   RenderText {#text} at (0,0) size 103x17
                     text run at (0,0) width 103: "...continues here"
diff --git a/LayoutTests/platform/glib/http/tests/misc/acid2-expected.txt b/LayoutTests/platform/glib/http/tests/misc/acid2-expected.txt
@@ -33,10 +33,10 @@ layer at (36,2638) size 764x226
     RenderTable {UL} at (96,192) size 48x12 [bgcolor=#FF0000]
       RenderTableSection (anonymous) at (0,0) size 48x12
         RenderTableRow (anonymous) at (0,0) size 48x12
-          RenderTableCell {LI} at (0,12) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
+          RenderTableCell {LI} at (0,0) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
           RenderTableCell (anonymous) at (12,0) size 12x12 [r=0 c=1 rs=1 cs=1]
             RenderTable {LI} at (0,0) size 12x12 [bgcolor=#000000]
-          RenderTableCell {LI} at (24,12) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
+          RenderTableCell {LI} at (24,0) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
           RenderTableCell (anonymous) at (36,0) size 12x12 [r=0 c=3 rs=1 cs=1]
             RenderListItem {LI} at (0,0) size 12x12 [bgcolor=#000000]
 layer at (48,2842) size 740x10 scrollHeight 276
diff --git a/LayoutTests/platform/glib/http/tests/misc/acid2-pixel-expected.txt b/LayoutTests/platform/glib/http/tests/misc/acid2-pixel-expected.txt
@@ -33,10 +33,10 @@ layer at (36,72) size 764x226
     RenderTable {UL} at (96,192) size 48x12 [bgcolor=#FF0000]
       RenderTableSection (anonymous) at (0,0) size 48x12
         RenderTableRow (anonymous) at (0,0) size 48x12
-          RenderTableCell {LI} at (0,12) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
+          RenderTableCell {LI} at (0,0) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
           RenderTableCell (anonymous) at (12,0) size 12x12 [r=0 c=1 rs=1 cs=1]
             RenderTable {LI} at (0,0) size 12x12 [bgcolor=#000000]
-          RenderTableCell {LI} at (24,12) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
+          RenderTableCell {LI} at (24,0) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
           RenderTableCell (anonymous) at (36,0) size 12x12 [r=0 c=3 rs=1 cs=1]
             RenderListItem {LI} at (0,0) size 12x12 [bgcolor=#000000]
 layer at (48,276) size 740x10 scrollHeight 276
diff --git a/LayoutTests/platform/ios/fast/css/acid2-expected.txt b/LayoutTests/platform/ios/fast/css/acid2-expected.txt
@@ -33,10 +33,10 @@ layer at (36,2640) size 764x226
     RenderTable {UL} at (96,192) size 48x12 [bgcolor=#FF0000]
       RenderTableSection (anonymous) at (0,0) size 48x12
         RenderTableRow (anonymous) at (0,0) size 48x12
-          RenderTableCell {LI} at (0,12) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
+          RenderTableCell {LI} at (0,0) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
           RenderTableCell (anonymous) at (12,0) size 12x12 [r=0 c=1 rs=1 cs=1]
             RenderTable {LI} at (0,0) size 12x12 [bgcolor=#000000]
-          RenderTableCell {LI} at (24,12) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
+          RenderTableCell {LI} at (24,0) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
           RenderTableCell (anonymous) at (36,0) size 12x12 [r=0 c=3 rs=1 cs=1]
             RenderListItem {LI} at (0,0) size 12x12 [bgcolor=#000000]
 layer at (48,2844) size 740x10 scrollHeight 277
diff --git a/LayoutTests/platform/ios/fast/css/acid2-pixel-expected.txt b/LayoutTests/platform/ios/fast/css/acid2-pixel-expected.txt
@@ -33,10 +33,10 @@ layer at (36,72) size 764x226
     RenderTable {UL} at (96,192) size 48x12 [bgcolor=#FF0000]
       RenderTableSection (anonymous) at (0,0) size 48x12
         RenderTableRow (anonymous) at (0,0) size 48x12
-          RenderTableCell {LI} at (0,12) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
+          RenderTableCell {LI} at (0,0) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
           RenderTableCell (anonymous) at (12,0) size 12x12 [r=0 c=1 rs=1 cs=1]
             RenderTable {LI} at (0,0) size 12x12 [bgcolor=#000000]
-          RenderTableCell {LI} at (24,12) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
+          RenderTableCell {LI} at (24,0) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
           RenderTableCell (anonymous) at (36,0) size 12x12 [r=0 c=3 rs=1 cs=1]
             RenderListItem {LI} at (0,0) size 12x12 [bgcolor=#000000]
 layer at (48,276) size 740x10 scrollHeight 277
diff --git a/LayoutTests/platform/ios/fast/dynamic/insert-before-table-part-in-continuation-expected.txt b/LayoutTests/platform/ios/fast/dynamic/insert-before-table-part-in-continuation-expected.txt
@@ -40,7 +40,7 @@ layer at (0,0) size 800x600
           RenderTable at (40,0) size 106x20
             RenderTableSection (anonymous) at (0,0) size 105x20
               RenderTableRow (anonymous) at (0,0) size 105x20
-                RenderTableCell {TD} at (0,15) size 0x0 [r=0 c=0 rs=1 cs=1]
+                RenderTableCell {TD} at (0,0) size 0x0 [r=0 c=0 rs=1 cs=1]
                 RenderTableCell {DIV} at (0,0) size 105x20 [r=0 c=1 rs=1 cs=1]
                   RenderText {#text} at (0,0) size 105x19
                     text run at (0,0) width 105: "...continues here"
diff --git a/LayoutTests/platform/ios/http/tests/misc/acid2-expected.txt b/LayoutTests/platform/ios/http/tests/misc/acid2-expected.txt
@@ -33,10 +33,10 @@ layer at (36,2640) size 764x226
     RenderTable {UL} at (96,192) size 48x12 [bgcolor=#FF0000]
       RenderTableSection (anonymous) at (0,0) size 48x12
         RenderTableRow (anonymous) at (0,0) size 48x12
-          RenderTableCell {LI} at (0,12) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
+          RenderTableCell {LI} at (0,0) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
           RenderTableCell (anonymous) at (12,0) size 12x12 [r=0 c=1 rs=1 cs=1]
             RenderTable {LI} at (0,0) size 12x12 [bgcolor=#000000]
-          RenderTableCell {LI} at (24,12) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
+          RenderTableCell {LI} at (24,0) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
           RenderTableCell (anonymous) at (36,0) size 12x12 [r=0 c=3 rs=1 cs=1]
             RenderListItem {LI} at (0,0) size 12x12 [bgcolor=#000000]
 layer at (48,2844) size 740x10 scrollHeight 277
diff --git a/LayoutTests/platform/ios/http/tests/misc/acid2-pixel-expected.txt b/LayoutTests/platform/ios/http/tests/misc/acid2-pixel-expected.txt
@@ -33,10 +33,10 @@ layer at (36,72) size 764x226
     RenderTable {UL} at (96,192) size 48x12 [bgcolor=#FF0000]
       RenderTableSection (anonymous) at (0,0) size 48x12
         RenderTableRow (anonymous) at (0,0) size 48x12
-          RenderTableCell {LI} at (0,12) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
+          RenderTableCell {LI} at (0,0) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
           RenderTableCell (anonymous) at (12,0) size 12x12 [r=0 c=1 rs=1 cs=1]
             RenderTable {LI} at (0,0) size 12x12 [bgcolor=#000000]
-          RenderTableCell {LI} at (24,12) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
+          RenderTableCell {LI} at (24,0) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
           RenderTableCell (anonymous) at (36,0) size 12x12 [r=0 c=3 rs=1 cs=1]
             RenderListItem {LI} at (0,0) size 12x12 [bgcolor=#000000]
 layer at (48,276) size 740x10 scrollHeight 277
diff --git a/LayoutTests/platform/mac/fast/css/acid2-expected.txt b/LayoutTests/platform/mac/fast/css/acid2-expected.txt
@@ -33,10 +33,10 @@ layer at (36,2638) size 764x226
     RenderTable {UL} at (96,192) size 48x12 [bgcolor=#FF0000]
       RenderTableSection (anonymous) at (0,0) size 48x12
         RenderTableRow (anonymous) at (0,0) size 48x12
-          RenderTableCell {LI} at (0,12) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
+          RenderTableCell {LI} at (0,0) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
           RenderTableCell (anonymous) at (12,0) size 12x12 [r=0 c=1 rs=1 cs=1]
             RenderTable {LI} at (0,0) size 12x12 [bgcolor=#000000]
-          RenderTableCell {LI} at (24,12) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
+          RenderTableCell {LI} at (24,0) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
           RenderTableCell (anonymous) at (36,0) size 12x12 [r=0 c=3 rs=1 cs=1]
             RenderListItem {LI} at (0,0) size 12x12 [bgcolor=#000000]
 layer at (48,2842) size 740x10 scrollHeight 276
diff --git a/LayoutTests/platform/mac/fast/css/acid2-pixel-expected.txt b/LayoutTests/platform/mac/fast/css/acid2-pixel-expected.txt
@@ -33,10 +33,10 @@ layer at (36,72) size 764x226
     RenderTable {UL} at (96,192) size 48x12 [bgcolor=#FF0000]
       RenderTableSection (anonymous) at (0,0) size 48x12
         RenderTableRow (anonymous) at (0,0) size 48x12
-          RenderTableCell {LI} at (0,12) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
+          RenderTableCell {LI} at (0,0) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
           RenderTableCell (anonymous) at (12,0) size 12x12 [r=0 c=1 rs=1 cs=1]
             RenderTable {LI} at (0,0) size 12x12 [bgcolor=#000000]
-          RenderTableCell {LI} at (24,12) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
+          RenderTableCell {LI} at (24,0) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
           RenderTableCell (anonymous) at (36,0) size 12x12 [r=0 c=3 rs=1 cs=1]
             RenderListItem {LI} at (0,0) size 12x12 [bgcolor=#000000]
 layer at (48,276) size 740x10 scrollHeight 276
diff --git a/LayoutTests/platform/mac/fast/dynamic/insert-before-table-part-in-continuation-expected.txt b/LayoutTests/platform/mac/fast/dynamic/insert-before-table-part-in-continuation-expected.txt
@@ -40,7 +40,7 @@ layer at (0,0) size 800x600
           RenderTable at (40,0) size 106x18
             RenderTableSection (anonymous) at (0,0) size 105x18
               RenderTableRow (anonymous) at (0,0) size 105x18
-                RenderTableCell {TD} at (0,14) size 0x0 [r=0 c=0 rs=1 cs=1]
+                RenderTableCell {TD} at (0,0) size 0x0 [r=0 c=0 rs=1 cs=1]
                 RenderTableCell {DIV} at (0,0) size 105x18 [r=0 c=1 rs=1 cs=1]
                   RenderText {#text} at (0,0) size 105x18
                     text run at (0,0) width 105: "...continues here"
diff --git a/LayoutTests/platform/mac/http/tests/misc/acid2-expected.txt b/LayoutTests/platform/mac/http/tests/misc/acid2-expected.txt
@@ -33,10 +33,10 @@ layer at (36,2638) size 764x226
     RenderTable {UL} at (96,192) size 48x12 [bgcolor=#FF0000]
       RenderTableSection (anonymous) at (0,0) size 48x12
         RenderTableRow (anonymous) at (0,0) size 48x12
-          RenderTableCell {LI} at (0,12) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
+          RenderTableCell {LI} at (0,0) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
           RenderTableCell (anonymous) at (12,0) size 12x12 [r=0 c=1 rs=1 cs=1]
             RenderTable {LI} at (0,0) size 12x12 [bgcolor=#000000]
-          RenderTableCell {LI} at (24,12) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
+          RenderTableCell {LI} at (24,0) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
           RenderTableCell (anonymous) at (36,0) size 12x12 [r=0 c=3 rs=1 cs=1]
             RenderListItem {LI} at (0,0) size 12x12 [bgcolor=#000000]
 layer at (48,2842) size 740x10 scrollHeight 276
diff --git a/LayoutTests/platform/mac/http/tests/misc/acid2-pixel-expected.txt b/LayoutTests/platform/mac/http/tests/misc/acid2-pixel-expected.txt
@@ -33,10 +33,10 @@ layer at (36,72) size 764x226
     RenderTable {UL} at (96,192) size 48x12 [bgcolor=#FF0000]
       RenderTableSection (anonymous) at (0,0) size 48x12
         RenderTableRow (anonymous) at (0,0) size 48x12
-          RenderTableCell {LI} at (0,12) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
+          RenderTableCell {LI} at (0,0) size 12x0 [bgcolor=#000000] [r=0 c=0 rs=1 cs=1]
           RenderTableCell (anonymous) at (12,0) size 12x12 [r=0 c=1 rs=1 cs=1]
             RenderTable {LI} at (0,0) size 12x12 [bgcolor=#000000]
-          RenderTableCell {LI} at (24,12) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
+          RenderTableCell {LI} at (24,0) size 12x0 [bgcolor=#000000] [r=0 c=2 rs=1 cs=1]
           RenderTableCell (anonymous) at (36,0) size 12x12 [r=0 c=3 rs=1 cs=1]
             RenderListItem {LI} at (0,0) size 12x12 [bgcolor=#000000]
 layer at (48,276) size 740x10 scrollHeight 276
diff --git a/Source/WebCore/rendering/RenderTableCell.cpp b/Source/WebCore/rendering/RenderTableCell.cpp
@@ -4,7 +4,7 @@
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
- * Copyright (C) 2003-2024 Apple Inc. All rights reserved.
+ * Copyright (C) 2003-2025 Apple Inc. All rights reserved.
  * Copyright (C) 2016-2017 Google Inc. All rights reserved.
  * Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
  *
@@ -288,6 +288,12 @@ bool RenderTableCell::computeIntrinsicPadding(LayoutUnit heightConstraint)
 
     auto applyStandard = [&] {
         auto baseline = cellBaselinePosition();
+        if (!firstInFlowChild() && baseline == borderAndPaddingBefore()) {
+            // If baseline equals borderAndPaddingBefore(), there is no real content.
+            intrinsicPaddingBefore = 0;
+            return;
+        }
+
         auto needsIntrinsicPadding = baseline > borderAndPaddingBefore() || !borderBoxLogicalHeight;
         if (needsIntrinsicPadding)
             intrinsicPaddingBefore = section()->rowBaseline(rowIndex()) - (baseline - oldIntrinsicPaddingBefore);
