--- /Volumes/z/safari/main/OpenSource/WebKitBuild/Debug/layout-test-results/fast/repaint/canvas-object-fit-expected.txt
+++ /Volumes/z/safari/main/OpenSource/WebKitBuild/Debug/layout-test-results/fast/repaint/canvas-object-fit-actual.txt
@@ -10,9 +10,6 @@
           (position 8.00 8.00)
           (bounds 202.00 102.00)
           (drawsContent 1)
-          (repaint rects
-            (rect 70.00 20.00 7.00 7.00)
-          )
         )
       )
     )

The problem is the two JS functions in the test are combined in one updateRendering() so we report one repaint rect which the entire canvas rect. So there is no user problem here but the test does not generate exactly the expected output.

To fix the test, the first JS function needs to run in the first updateRendering() loop instead of running it onload. It looks like running the first JS function after two requestAnimationFrame(), fixes the test for WK1 as well.