1 files changed, 59 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/forms/form-submission-0/form-double-submit-preventdefault.html b/testing/web-platform/tests/html/semantics/forms/form-submission-0/form-double-submit-preventdefault.html
new file mode 100644
index 0000000000..b63b78916c
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/forms/form-submission-0/form-double-submit-preventdefault.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#form-submission-algorithm">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="./resources/targetted-form.js"></script>
+<!--
+  The submit() in event handler should *not* get superseded in this case by the
+  default action submit(), because event handler here calls preventDefault().
+-->
+<body>
+<script>
+promise_test(async () => {
+  let form = populateForm('<input name=n1 value=v1><input type=submit>');
+  let iframe = form.previousSibling;
+  let input = form.querySelector("input[name=n1]");
+  let submitter = form.querySelector("input[type=submit]");
+  form.addEventListener('click', () => {
+    input.value = 'v2';
+    form.submit();
+    input.value = 'v3';
+    form.submit();
+    input.value = 'v4';
+  });
+  form.addEventListener('submit', (e) => {
+    e.preventDefault();
+    input.value = 'v5';
+    form.submit();
+    input.value = 'v6';
+    form.submit();
+    input.value = 'v7';
+  });
+  submitter.click();
+  await loadPromise(iframe);
+  assert_equals(getParamValue(iframe, "n1"), "v6");
+}, 'PreventDefaulting form onsubmit should allow submit() to succeed');
+
+promise_test(async () => {
+  let form = populateForm('<input type=submit><input name=n1 value=v1>');
+  let iframe = form.previousSibling;
+  let input = form['n1'];
+  let submitter = form.querySelector('input[type=submit]');
+  form.addEventListener('submit', e => {
+    e.preventDefault();
+    input.value = 'v2';
+    form.submit();
+
+    input.value = 'v3';
+    form.remove();
+    form.submit();
+    document.body.insertBefore(form, iframe.nextSibling);
+    input.value = 'v4';
+  });
+  submitter.click();
+  await loadPromise(iframe);
+  assert_equals(getParamValue(iframe, "n1"), "v2");
+}, 'PreventDefaulting form onsubmit should allow submit() to succeed and the second submit() which is invalid should not supersede first one');
+</script>
+</body>