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diff --git a/testing/web-platform/tests/html/semantics/forms/attributes-common-to-form-controls/formaction.html b/testing/web-platform/tests/html/semantics/forms/attributes-common-to-form-controls/formaction.html
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+++ b/testing/web-platform/tests/html/semantics/forms/attributes-common-to-form-controls/formaction.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html><head>
+        <title>formaction on button element</title>
+        <meta content="text/html; charset=UTF-8" http-equiv="content-type">
+        <meta content="formaction on button element" name="description">
+    <link href="https://html.spec.whatwg.org/multipage/#dom-fs-formaction" rel="help">
+</head>
+    <body>
+        <script src="/resources/testharness.js"></script>
+        <script src="/resources/testharnessreport.js"></script>
+
+        <div id="log"></div>
+        <button formaction="http://www.example.com/" style="display: none" type="submit">Submit</button>
+        <input formaction="http://www.example.com/" style="display: none" type="submit" value="submit">
+        <input style="display: none" type="submit" value="submit">
+        <input formaction="" style="display: none" type="submit" value="submit">
+
+        <script type="text/javascript">
+        function relativeToAbsolute(relativeURL) {
+          var a = document.createElement('a');
+          a.href = relativeURL;
+          return a.href;
+        }
+        test(function() {assert_equals(document.getElementsByTagName("button")[0].formAction, "http://www.example.com/")}, "formAction on button support");
+        test(function() {assert_equals(document.getElementsByTagName("input")[0].formAction, "http://www.example.com/")}, "formAction on input support");
+
+        var testElem = document.getElementsByTagName("input")[0];
+        testElem.formAction = "http://www.example.com/page2.html";
+
+        test(function() {assert_equals(document.getElementsByTagName("input")[0].formAction, "http://www.example.com/page2.html")}, "formaction absolute URL value on input reflects correct value after being updated by the DOM");
+        test(function() {assert_equals(document.getElementsByTagName("input")[0].getAttribute("formaction"), "http://www.example.com/page2.html")}, "formAction absolute URL value is correct using getAttribute");
+
+        var testElem = document.getElementsByTagName("input")[0];
+        testElem.formAction = "../page3.html";
+
+        test(function() {assert_equals(document.getElementsByTagName("input")[0].formAction, relativeToAbsolute('../page3.html'))}, "formAction relative URL value on input reflects correct value after being updated by the DOM");
+        test(function() {assert_equals(document.getElementsByTagName("input")[0].getAttribute("formaction"), "../page3.html")}, "formAction relative URL value is correct using getAttribute");
+
+        test(function() {assert_equals(document.getElementsByTagName("input")[1].formAction, document.URL)}, "On getting, when formaction is missing, the document's address must be returned");
+        test(function() {assert_equals(document.getElementsByTagName("input")[2].formAction, document.URL)}, "On getting, when formaction value is the empty string, the document's address must be returned");
+        </script>
+</body></html>