fast/css/text-overflow-input.html

this test has been failing on Big Sur sense arrant r270123, I need to bisect to confirm a regression point

History:
https://results.webkit.org/?suite=layout-tests&test=fast%2Fcss%2Ftext-overflow-input.html

Diff
--- /Volumes/Data/slave/bigsur-release-tests-wk2/build/layout-test-results/fast/css/text-overflow-input-expected.txt
+++ /Volumes/Data/slave/bigsur-release-tests-wk2/build/layout-test-results/fast/css/text-overflow-input-actual.txt
@@ -118,7 +118,7 @@
         RenderTextControl {INPUT} at (403,20) size 147x19 [bgcolor=#FFFFFF] [border: (2px inset #000000)]
         RenderText {#text} at (551,20) size 5x18
           text run at (551,20) width 5: " "
-        RenderBR {BR} at (0,0) size 0x0
+        RenderBR {BR} at (555,20) size 1x18
         RenderText {#text} at (0,43) size 270x18
           text run at (0,43) width 270: "Ellipsis to clip (should not show ellipsis): "
         RenderTextControl {INPUT} at (271,43) size 148x19 [bgcolor=#FFFFFF] [border: (2px inset #000000)]
@@ -127,7 +127,7 @@
         RenderTextControl {INPUT} at (426,43) size 148x19 [bgcolor=#FFFFFF] [border: (2px inset #000000)]
         RenderText {#text} at (575,43) size 5x18
           text run at (575,43) width 5: " "
-        RenderBR {BR} at (0,0) size 0x0
+        RenderBR {BR} at (579,43) size 1x18
 layer at (13,73) size 141x13 scrollWidth 288
   RenderBlock {DIV} at (3,3) size 141x13 [color=#A9A9A9]
     RenderText {#text} at (0,0) size 288x13