diff --git a/c2cwsgiutils/acceptance/image.py b/c2cwsgiutils/acceptance/image.py
index e531745b8..f5a53b7e1 100644
--- a/c2cwsgiutils/acceptance/image.py
+++ b/c2cwsgiutils/acceptance/image.py
@@ -159,6 +159,7 @@ def check_screenshot(
     expected_filename: str,
     width: int = 800,
     height: int = 600,
+    sleep: int = 0,
     headers: Optional[dict[str, str]] = None,
     media: Optional[list[dict[str, str]]] = None,
     level: float = 1.0,
@@ -192,6 +193,7 @@ def check_screenshot(
             f"--url={url}",
             f"--width={width}",
             f"--height={height}",
+            f"--sleep={sleep}",
             f"--headers={json.dumps(headers)}",
             f"--media={json.dumps(media)}",
             f"--output={actual_filename}",
diff --git a/c2cwsgiutils/acceptance/screenshot.js b/c2cwsgiutils/acceptance/screenshot.js
index 99c017fa4..9661df891 100644
--- a/c2cwsgiutils/acceptance/screenshot.js
+++ b/c2cwsgiutils/acceptance/screenshot.js
@@ -6,6 +6,7 @@ program
   .option('--output <char>', 'The output filename')
   .option('--width <int>', 'The page width', 800)
   .option('--height <int>', 'The page height', 600)
+  .option('--sleep <int>', 'Sleep that the page is fully loaded [ms]', 0)
   .option('--headers <str>', 'The headers', '{}')
   // see: https://pptr.dev/api/puppeteer.page.emulatemediafeatures
   .option('--media <str>', 'The media feature, see Page.emulateMediaFeatures', '[]');
@@ -54,6 +55,7 @@ const options = program.opts();
     width: parseInt(options.width),
     height: parseInt(options.height),
   });
+  await page.waitForTimeout(parseInt(options.sleep));
   await page.screenshot({
     path: options.output,
     clip: { x: 0, y: 0, width: parseInt(options.width), height: parseInt(options.height) },