diff --git a/src/webgpu/web_platform/copyToTexture/canvas.spec.ts b/src/webgpu/web_platform/copyToTexture/canvas.spec.ts
index f48da3e62e48..7b3cad456baa 100644
--- a/src/webgpu/web_platform/copyToTexture/canvas.spec.ts
+++ b/src/webgpu/web_platform/copyToTexture/canvas.spec.ts
@@ -468,7 +468,9 @@ g.test('copy_contents_from_2d_context_canvas')
       },
       expTexelView,
       { width, height, depthOrArrayLayers: 1 },
-      { maxDiffULPsForNormFormat: 0, maxDiffULPsForFloatFormat: 0 }
+      // 1.0 and 0.6 are representable precisely by all formats except rgb10a2unorm, but
+      // allow diffs of 1ULP since that's the generally-appropriate threshold.
+      { maxDiffULPsForNormFormat: 1, maxDiffULPsForFloatFormat: 1 }
     );
   });
 
@@ -570,7 +572,9 @@ g.test('copy_contents_from_gl_context_canvas')
       },
       expTexelView,
       { width, height, depthOrArrayLayers: 1 },
-      { maxDiffULPsForNormFormat: 0, maxDiffULPsForFloatFormat: 0 }
+      // 1.0 and 0.6 are representable precisely by all formats except rgb10a2unorm, but
+      // allow diffs of 1ULP since that's the generally-appropriate threshold.
+      { maxDiffULPsForNormFormat: 1, maxDiffULPsForFloatFormat: 1 }
     );
   });
 
@@ -687,7 +691,9 @@ g.test('copy_contents_from_gpu_context_canvas')
       },
       expTexelView,
       { width: canvas.width, height: canvas.height, depthOrArrayLayers: 1 },
-      { maxDiffULPsForNormFormat: 0, maxDiffULPsForFloatFormat: 0 }
+      // 1.0 and 0.6 are representable precisely by all formats except rgb10a2unorm, but
+      // allow diffs of 1ULP since that's the generally-appropriate threshold.
+      { maxDiffULPsForNormFormat: 1, maxDiffULPsForFloatFormat: 1 }
     );
   });