Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/UI/HtmlControls/HtmlElement.cs

@@ -0,0 +1,42 @@
+//------------------------------------------------------------------------------
+// <copyright file="HtmlElement.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI.HtmlControls {
+    using System.ComponentModel;
+    using System.Web;
+    using System.Web.UI;
+
+    public class HtmlElement : HtmlContainerControl {
+
+        public HtmlElement() : base("html") {
+        }
+
+        [
+        WebCategory("Behavior"),
+        DefaultValue(""),
+        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
+        UrlProperty()
+        ]
+        public string Manifest {
+            get {
+                string s = Attributes["manifest"];
+                return s ?? String.Empty;
+            }
+            set {
+                Attributes["manifest"] = MapStringAttributeToString(value);
+            }
+        }
+
+        /*
+         * Override to process manifest attribute
+         */
+        protected override void RenderAttributes(HtmlTextWriter writer) {
+            PreProcessRelativeReferenceAttribute(writer, "manifest");
+            base.RenderAttributes(writer);
+        }
+
+    }
+}