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diff --git a/testing/web-platform/tests/XMLHttpRequest/send-data-es-object.htm b/testing/web-platform/tests/XMLHttpRequest/send-data-es-object.htm
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+<!doctype html>
+<meta charset=utf-8>
+<title>XMLHttpRequest: passing objects to send()</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::ol/li[4]" />
+<link rel="help" href="https://heycam.github.io/webidl/#es-union" data-tested-assertations="following::ol/li[16]" />
+
+<div id="log"></div>
+
+<script>
+  function do_test(obj, expected, name) {
+    var test = async_test(name)
+    test.step(function() {
+      var client = new XMLHttpRequest()
+      client.onload = test.step_func(function () {
+        assert_equals(client.responseText, expected)
+        test.done()
+      });
+      client.open('POST', 'resources/content.py')
+      if (expected.exception) {
+        assert_throws(expected.exception, function(){client.send(obj)})
+        test.done()
+      } else {
+        client.send(obj)
+      }
+    });
+  }
+
+  do_test({}, '[object Object]', 'sending a plain empty object')
+  do_test(Math, '[object Math]', 'sending the ES Math object')
+  do_test(new XMLHttpRequest, '[object XMLHttpRequest]', 'sending a new XHR instance')
+  do_test({toString:function(){}}, 'undefined', 'sending object that stringifies to undefined')
+  do_test({toString:function(){return null}}, 'null', 'sending object that stringifies to null')
+  var ancestor = {toString: function(){
+    var ar=[]
+    for (var prop in this) {
+      if (this.hasOwnProperty(prop)) {
+        ar.push(prop+'='+this[prop])
+      }
+    };
+    return ar.join('&')
+  }};
+
+  var myObj = Object.create(ancestor, {foo:{value:1, enumerable: true},  bar:{value:'foo', enumerable:true}})
+  do_test(myObj, 'foo=1&bar=foo', 'object that stringifies to query string')
+
+  var myFakeJSON = {a:'a', b:'b', toString:function(){ return JSON.stringify(this, function(key, val){ return key ==='toString'?undefined:val; }) }}
+  do_test(myFakeJSON, '{"a":"a","b":"b"}', 'object that stringifies to JSON string')
+
+  var myFakeDoc1 = {valueOf:function(){return document}}
+  do_test(myFakeDoc1, '[object Object]', 'object whose valueOf() returns a document - ignore valueOf(), stringify')
+
+  var myFakeDoc2 = {toString:function(){return document}}
+  do_test(myFakeDoc2, {exception:new TypeError()}, 'object whose toString() returns a document, expected to throw')
+
+  var myThrower = {toString:function(){throw {name:'FooError', message:'bar'}}}
+  do_test(myThrower, {exception:{name:'FooError'}}, 'object whose toString() throws, expected to throw')
+
+
+</script>