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diff --git a/test/wpt/tests/xhr/setrequestheader-case-insensitive.htm b/test/wpt/tests/xhr/setrequestheader-case-insensitive.htm
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--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-case-insensitive.htm
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+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: setRequestHeader() - headers that differ in case</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method">
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("POST", "resources/inspect-headers.py?filter_value=t1, t2, t3", false)
+        client.setRequestHeader("x-test", "t1")
+        client.setRequestHeader("X-TEST", "t2")
+        client.setRequestHeader("X-teST", "t3")
+        client.send(null)
+        assert_equals(client.responseText, "x-test,")
+      })
+
+      test(() => {
+        const client = new XMLHttpRequest
+        client.open("GET", "resources/echo-headers.py", false)
+        client.setRequestHeader("THIS-IS-A-TEST", "1")
+        client.setRequestHeader("THIS-is-A-test", "2")
+        client.setRequestHeader("content-TYPE", "x/x")
+        client.send()
+        assert_regexp_match(client.responseText, /content-TYPE/)
+        assert_regexp_match(client.responseText, /THIS-IS-A-TEST: 1, 2/)
+      })
+    </script>
+  </body>
+</html>