using AngleSharp.DOM.Collections; namespace AngleSharp.DOM.Html { public abstract class HTMLFormControlElement : HTMLElement, ILabelabelElement { private NodeList labels; public bool SupportsLabels { get; set; } public NodeList Labels => labels; internal HTMLFormControlElement() { labels = new NodeList(); } protected HTMLFormElement GetAssignedForm() { Node node = _parent; while (!(node is HTMLFormElement) && node != null) { node = node.ParentElement; } if (node == null && _owner == null) return null; if (node == null) { string attribute = GetAttribute("form"); if (node != null || string.IsNullOrEmpty(attribute)) return null; node = _owner.GetElementById(attribute); } return node as HTMLFormElement; } } }