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diff --git a/testing/web-platform/tests/html/semantics/forms/attributes-common-to-form-controls/dirname-rtl-inherited.html b/testing/web-platform/tests/html/semantics/forms/attributes-common-to-form-controls/dirname-rtl-inherited.html
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+++ b/testing/web-platform/tests/html/semantics/forms/attributes-common-to-form-controls/dirname-rtl-inherited.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Submitting element directionality: the dirname attribute</title>
+<link rel="author" title="Kolupaev Dmitry" href="mailto:dmitry.klpv@gmail.com">
+<link rel=help href="https://html.spec.whatwg.org/multipage/#submitting-element-directionality:-the-dirname-attribute">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/dirname.js"></script>
+<div id="log"></div>
+<div dir="rtl">
+  <form action="resources/dirname-iframe.html" method=get target="iframe">
+    <p><label>User: <input type=text name="user" dirname="user.dir" required/></label></p>
+    <p><label>Comment: <textarea name="comment" dirname="comment.dir" required></textarea></label></p>
+    <p><button type=submit>Post Comment</button></p>
+  </form>
+</div>
+<iframe name="iframe"></iframe>
+<script>
+  document.querySelector("input").value = "foobar";
+  document.querySelector("textarea").value = "foobar";
+  document.querySelector("button").click();
+
+  var t_inp = async_test("submit input element directionality");
+  onIframeLoadedDone(t_inp, function(params) {
+    assert_equals(params.get("user.dir"), "rtl");
+  });
+
+  var t_ta = async_test("submit textarea element directionality");
+  onIframeLoadedDone(t_ta, function(params) {
+    assert_equals(params.get("comment.dir"), "rtl");
+  });
+</script>