third_party/blink/renderer/core/html/forms/html_legend_element.cc

/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2001 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
 *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "third_party/blink/renderer/core/html/forms/html_legend_element.h"

#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/html/forms/html_field_set_element.h"
#include "third_party/blink/renderer/core/html_names.h"

namespace blink {

using namespace html_names;

HTMLLegendElement::HTMLLegendElement(Document& document)
    : HTMLElement(kLegendTag, document) {}

HTMLFormElement* HTMLLegendElement::form() const {
  // According to the specification, If the legend has a fieldset element as
  // its parent, then the form attribute must return the same value as the
  // form attribute on that fieldset element. Otherwise, it must return null.
  if (auto* fieldset = ToHTMLFieldSetElementOrNull(parentNode()))
    return fieldset->formOwner();
  return nullptr;
}

}  // namespace blink