1 files changed, 32 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/support/download_stash.py b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/support/download_stash.py
new file mode 100644
index 0000000000..11366a9c3f
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/support/download_stash.py
@@ -0,0 +1,32 @@
+import time
+
+def main(request, response):
+    token = request.GET[b"token"]
+    response.status = 200
+    response.headers.append(b"Content-Type", b"text/html")
+
+    # Make sure to disable sniffing because it would read enough bytes to finish
+    # the load, before even giving the client application a chance to cancel it.
+    response.headers.append(b"X-Content-Type-Options", b"nosniff")
+
+    if b"verify-token" in request.GET:
+      if request.server.stash.take(token):
+        return u'TOKEN_SET'
+      return u'TOKEN_NOT_SET'
+
+    if b"finish-delay" not in request.GET:
+      # <a download>
+      request.server.stash.put(token, True)
+      return
+
+    # navigation to download
+    response.headers.append(b"Content-Disposition", b"attachment")
+    response.write_status_headers()
+    finish_delay = float(request.GET[b"finish-delay"]) / 1E3
+    count = 10
+    single_delay = finish_delay / count
+    for i in range(count): # pylint: disable=unused-variable
+        time.sleep(single_delay)
+        if not response.writer.write_content(b"\n"):
+          return
+    request.server.stash.put(token, True)