1 files changed, 32 insertions, 0 deletions
diff --git a/testing/web-platform/tests/xhr/getresponseheader-unsent-opened-state.htm b/testing/web-platform/tests/xhr/getresponseheader-unsent-opened-state.htm
new file mode 100644
index 0000000000..e3bc2720f1
--- /dev/null
+++ b/testing/web-platform/tests/xhr/getresponseheader-unsent-opened-state.htm
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: getResponseHeader() in unsent, opened states</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-getresponseheader" data-tested-assertations="/following::OL[1]/LI[1]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        assert_equals(client.getResponseHeader("x-custom-header"), null)
+        client.onreadystatechange = function() {
+          test.step(function() {
+            if(client.readyState < 2) {
+              assert_equals(client.getResponseHeader("x-custom-header"), null)
+              assert_equals(client.getResponseHeader("CONTENT-TYPE"), null)
+              test.done()
+            }
+          })
+        }
+        client.open("GET", "resources/headers.py")
+        assert_equals(client.getResponseHeader("x-custom-header"), null)
+        assert_equals(client.getResponseHeader("Date"), null)
+        client.send(null)
+      })
+  </script>
+ </body>
+</html>