1 files changed, 82 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/forms/form-submission-target/resources/reltester.js b/testing/web-platform/tests/html/semantics/forms/form-submission-target/resources/reltester.js
new file mode 100644
index 0000000000..8ca9ddbc27
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/forms/form-submission-target/resources/reltester.js
@@ -0,0 +1,82 @@
+function formUsesTargetBlank(submitter) {
+  if (submitter.formTarget && submitter.formTarget === "_blank") {
+    return true;
+  }
+  if (submitter.form && submitter.form.target === "_blank") {
+    return true;
+  }
+  if (submitter.target && submitter.target === "_blank") {
+    return true;
+  }
+  if (submitter.getRootNode().querySelector("base").target === "_blank") {
+    return true;
+  }
+  return false;
+}
+
+function relTester(submitter, channelInput, title) {
+  [
+    {
+      rel: "",
+      exposed: "all"
+    },
+    {
+      rel: "noopener",
+      exposed: "noopener"
+    },
+    {
+      rel: "noreferrer",
+      exposed: "noreferrer"
+    },
+    {
+      rel: "opener",
+      exposed: "all"
+    },
+    {
+      rel: "noopener noreferrer",
+      exposed: "noreferrer"
+    },
+    {
+      rel: "noreferrer opener",
+      exposed: "noreferrer"
+    },
+    {
+      rel: "opener noopener",
+      exposed: "noopener"
+    }
+  ].forEach(relTest => {
+    // Use promise_test to submit only after one test concluded
+    promise_test(t => {
+      return new Promise(resolve => {
+        const channelName = Date.now() + relTest.rel,
+              channel = new BroadcastChannel(channelName);
+        let form = submitter;
+        if (submitter.localName !== "form") {
+          form = submitter.form;
+        }
+        form.rel = relTest.rel;
+        channelInput.value = channelName;
+        if (submitter.localName !== "form") {
+          submitter.click();
+        } else {
+          submitter.submit();
+        }
+        channel.onmessage = t.step_func(e => {
+          if (relTest.exposed === "all" || relTest.exposed === "noopener") {
+            assert_equals(e.data.referrer, window.location.href, "referrer");
+          } else {
+            assert_equals(e.data.referrer, "", "referrer");
+          }
+          // When rel is not explicitly given, account for target=_blank defaulting to noopener
+          if (relTest.exposed === "all" && !(relTest.rel === "" && formUsesTargetBlank(submitter))) {
+            assert_true(e.data.haveOpener, "opener");
+          } else {
+            assert_false(e.data.haveOpener, "opener");
+          }
+          resolve();
+        });
+        t.add_cleanup(() => channel.postMessage(null));
+      });
+    }, `<form rel="${relTest.rel}"> with ${title}`);
+  });
+}