diff --git a/test/screencast.spec.ts b/test/screencast.spec.ts
index 19ee716f25..4e9ee89571 100644
--- a/test/screencast.spec.ts
+++ b/test/screencast.spec.ts
@@ -90,25 +90,26 @@ export class VideoPlayer {
 }
 
 function almostRed(r, g, b, alpha) {
-  expect(g).toBeLessThan(50);
-  expect(b).toBeLessThan(50);
+  expect(r).toBeGreaterThan(185);
+  expect(g).toBeLessThan(70);
+  expect(b).toBeLessThan(70);
   expect(alpha).toBe(255);
 }
 
 function almostBlack(r, g, b, alpha) {
-  expect(r).toBeLessThan(30);
-  expect(g).toBeLessThan(30);
-  expect(b).toBeLessThan(30);
+  expect(r).toBeLessThan(70);
+  expect(g).toBeLessThan(70);
+  expect(b).toBeLessThan(70);
   expect(alpha).toBe(255);
 }
 
-function almostGrey(r, g, b, alpha) {
+function almostGray(r, g, b, alpha) {
   expect(r).toBeGreaterThan(70);
   expect(g).toBeGreaterThan(70);
   expect(b).toBeGreaterThan(70);
-  expect(r).toBeLessThan(130);
-  expect(g).toBeLessThan(130);
-  expect(b).toBeLessThan(130);
+  expect(r).toBeLessThan(185);
+  expect(g).toBeLessThan(185);
+  expect(b).toBeLessThan(185);
   expect(alpha).toBe(255);
 }
 
@@ -286,12 +287,13 @@ describe('screencast', suite => {
 
     {
       const pixels = videoPlayer.seekLastFrame().data;
-      expectAll(pixels, almostGrey);
+      expectAll(pixels, almostGray);
     }
   });
 
-  it('should capture css transformation', (test, { headful }) => {
+  it('should capture css transformation', (test, { headful, browserName, platform }) => {
     test.fixme(headful, 'Fails on headful');
+    test.fixme(browserName === 'webkit' && platform === 'win32', 'Fails on headful');
   }, async ({browser, server, testInfo}) => {
     const size = { width: 320, height: 240 };
     // Set viewport equal to screencast frame size to avoid scaling.
@@ -385,11 +387,11 @@ describe('screencast', suite => {
     }
     {
       const pixels = videoPlayer.seekLastFrame({x: 300, y: 0}).data;
-      expectAll(pixels, almostGrey);
+      expectAll(pixels, almostGray);
     }
     {
       const pixels = videoPlayer.seekLastFrame({x: 0, y: 200}).data;
-      expectAll(pixels, almostGrey);
+      expectAll(pixels, almostGray);
     }
     {
       const pixels = videoPlayer.seekLastFrame({x: 300, y: 200}).data;