[js] update implementation for submitting forms

javascript/node/selenium-webdriver/lib/webdriver.js

@@ -2765,13 +2765,17 @@ class WebElement {
    *     when the form has been submitted.
    */
   submit() {
-    const form = this.findElement({ xpath: './ancestor-or-self::form' })
-    this.driver_.executeScript(
-      "var e = arguments[0].ownerDocument.createEvent('Event');" +
-        "e.initEvent('submit', true, true);" +
-        'if (arguments[0].dispatchEvent(e)) { arguments[0].submit() }',
-      form
-    )
+    const script = "var form = arguments[0];\n" +
+      "while (form.nodeName != \"FORM\" && form.parentNode) {\n" +
+      "  form = form.parentNode;\n" +
+      "}\n" +
+      "if (!form) { throw Error('Unable to find containing form element'); }\n" +
+      "if (!form.ownerDocument) { throw Error('Unable to find owning document'); }\n" +
+      "var e = form.ownerDocument.createEvent('Event');\n" +
+      "e.initEvent('submit', true, true);\n" +
+      "if (form.dispatchEvent(e)) { HTMLFormElement.prototype.submit.call(form) }\n";
+
+    this.driver_.executeScript(script, this);
   }
 
   /**