1 files changed, 7 insertions, 0 deletions
diff --git a/testing/web-platform/tests/event-timing/resources/slow-image.py b/testing/web-platform/tests/event-timing/resources/slow-image.py
new file mode 100644
index 0000000000..c2f91655cf
--- /dev/null
+++ b/testing/web-platform/tests/event-timing/resources/slow-image.py
@@ -0,0 +1,7 @@
+import time
+
+def main(request, response):
+    # Sleep for 500ms to delay onload.
+    time.sleep(0.5)
+    response.headers.set(b"Cache-Control", b"no-cache, must-revalidate");
+    response.headers.set(b"Location", b"data:image/gif;base64,R0lGODlhAQABAJAAAMjIyAAAACwAAAAAAQABAAACAgQBADs%3D");