diff --git a/testing/web-platform/tests/origin-isolation/insecure-http.sub.html b/testing/web-platform/tests/origin-isolation/insecure-http.sub.html
new file mode 100644
index 0000000000000..8e49fcc50d61c
--- /dev/null
+++ b/testing/web-platform/tests/origin-isolation/insecure-http.sub.html
@@ -0,0 +1,254 @@
+<
+!
+DOCTYPE
+html
+>
+<
+meta
+charset
+=
+"
+utf
+-
+8
+"
+>
+<
+title
+>
+Parent
+requests
+isolation
+child
+requests
+isolation
+child
+is
+a
+subdomain
+of
+the
+parent
+but
+all
+over
+insecure
+HTTP
+<
+/
+title
+>
+<
+script
+src
+=
+"
+/
+resources
+/
+testharness
+.
+js
+"
+>
+<
+/
+script
+>
+<
+script
+src
+=
+"
+/
+resources
+/
+testharnessreport
+.
+js
+"
+>
+<
+/
+script
+>
+<
+div
+id
+=
+"
+log
+"
+>
+<
+/
+div
+>
+<
+script
+type
+=
+"
+module
+"
+>
+import
+{
+insertIframe
+sendWasmModule
+setBothDocumentDomains
+}
+from
+"
+.
+/
+resources
+/
+helpers
+.
+mjs
+"
+;
+let
+frameWindow
+;
+promise_setup
+(
+async
+(
+)
+=
+>
+{
+frameWindow
+=
+await
+insertIframe
+(
+"
+{
+{
+hosts
+[
+]
+[
+www
+]
+}
+}
+"
+"
+?
+1
+"
+)
+;
+}
+)
+;
+/
+/
+All
+isolation
+requests
+are
+ignored
+since
+this
+is
+over
+insecure
+HTTP
+.
+/
+/
+So
+both
+end
+up
+in
+the
+site
+-
+keyed
+agent
+cluster
+.
+promise_test
+(
+async
+(
+)
+=
+>
+{
+const
+whatHappened
+=
+await
+sendWasmModule
+(
+frameWindow
+)
+;
+assert_equals
+(
+whatHappened
+"
+WebAssembly
+.
+Module
+message
+received
+"
+)
+;
+}
+"
+message
+event
+must
+occur
+"
+)
+;
+promise_test
+(
+async
+(
+)
+=
+>
+{
+await
+setBothDocumentDomains
+(
+frameWindow
+)
+;
+/
+/
+Must
+not
+throw
+frameWindow
+.
+document
+;
+}
+"
+setting
+document
+.
+domain
+must
+give
+sync
+access
+"
+)
+;
+<
+/
+script
+>
diff --git a/testing/web-platform/tests/origin-isolation/insecure-http.sub.html.headers b/testing/web-platform/tests/origin-isolation/insecure-http.sub.html.headers
new file mode 100644
index 0000000000000..14674dea1d4d3
--- /dev/null
+++ b/testing/web-platform/tests/origin-isolation/insecure-http.sub.html.headers
@@ -0,0 +1,6 @@
+Origin
+-
+Isolation
+:
+?
+1