diff --git a/src/Microsoft.AspNet.Html.Abstractions/HtmlContentBuilderExtensions.cs b/src/Microsoft.AspNet.Html.Abstractions/HtmlContentBuilderExtensions.cs
new file mode 100644
index 0000000000..bfd5e3ef03
--- /dev/null
+++ b/src/Microsoft.AspNet.Html.Abstractions/HtmlContentBuilderExtensions.cs
@@ -0,0 +1,136 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Diagnostics;
+using System.IO;
+using Microsoft.Framework.WebEncoders;
+
+namespace Microsoft.AspNet.Html.Abstractions
+{
+    /// <summary>
+    /// Extension methods for <see cref="IHtmlContentBuilder"/>.
+    /// </summary>
+    public static class HtmlContentBuilderExtensions
+    {
+        /// <summary>
+        /// Appends an <see cref="Environment.NewLine"/>.
+        /// </summary>
+        /// <param name="builder">The <see cref="IHtmlContentBuilder"/>.</param>
+        /// <returns>The <see cref="IHtmlContentBuilder"/>.</returns>
+        public static IHtmlContentBuilder AppendLine(this IHtmlContentBuilder builder)
+        {
+            builder.Append(HtmlEncodedString.NewLine);
+            return builder;
+        }
+
+        /// <summary>
+        /// Appends an <see cref="Environment.NewLine"/> after appending the <see cref="string"/> value.
+        /// The value is treated as unencoded as-provided, and will be HTML encoded before writing to output.
+        /// </summary>
+        /// <param name="builder">The <see cref="IHtmlContentBuilder"/>.</param>
+        /// <param name="unencoded">The <see cref="string"/> to append.</param>
+        /// <returns>The <see cref="IHtmlContentBuilder"/>.</returns>
+        public static IHtmlContentBuilder AppendLine(this IHtmlContentBuilder builder, string unencoded)
+        {
+            builder.Append(unencoded);
+            builder.Append(HtmlEncodedString.NewLine);
+            return builder;
+        }
+
+        /// <summary>
+        /// Appends an <see cref="Environment.NewLine"/> after appending the <see cref="IHtmlContent"/> value.
+        /// </summary>
+        /// <param name="builder">The <see cref="IHtmlContentBuilder"/>.</param>
+        /// <param name="content">The <see cref="IHtmlContent"/> to append.</param>
+        /// <returns>The <see cref="IHtmlContentBuilder"/>.</returns>
+        public static IHtmlContentBuilder AppendLine(this IHtmlContentBuilder builder, IHtmlContent htmlContent)
+        {
+            builder.Append(htmlContent);
+            builder.Append(HtmlEncodedString.NewLine);
+            return builder;
+        }
+
+        /// <summary>
+        /// Appends an <see cref="Environment.NewLine"/> after appending the <see cref="string"/> value.
+        /// The value is treated as HTML encoded as-provided, and no further encoding will be performed.
+        /// </summary>
+        /// <param name="builder">The <see cref="IHtmlContentBuilder"/>.</param>
+        /// <param name="content">The HTML encoded <see cref="string"/> to append.</param>
+        /// <returns>The <see cref="IHtmlContentBuilder"/>.</returns>
+        public static IHtmlContentBuilder AppendLineEncoded(this IHtmlContentBuilder builder, string encoded)
+        {
+            builder.AppendEncoded(encoded);
+            builder.Append(HtmlEncodedString.NewLine);
+            return builder;
+        }
+
+        /// <summary>
+        /// Sets the content to the <see cref="string"/> value. The value is treated as unencoded as-provided,
+        /// and will be HTML encoded before writing to output.
+        /// </summary>
+        /// <param name="builder">The <see cref="IHtmlContentBuilder"/>.</param>
+        /// <param name="value">The <see cref="string"/> value that replaces the content.</param>
+        /// <returns>The <see cref="IHtmlContentBuilder"/>.</returns>
+        public static IHtmlContentBuilder SetContent(this IHtmlContentBuilder builder, string unencoded)
+        {
+            builder.Clear();
+            builder.Append(unencoded);
+            return builder;
+        }
+
+        /// <summary>
+        /// Sets the content to the <see cref="IHtmlContent"/> value.
+        /// </summary>
+        /// <param name="builder">The <see cref="IHtmlContentBuilder"/>.</param>
+        /// <param name="value">The <see cref="IHtmlContent"/> value that replaces the content.</param>
+        /// <returns>The <see cref="IHtmlContentBuilder"/>.</returns>
+        public static IHtmlContentBuilder SetContent(this IHtmlContentBuilder builder, IHtmlContent content)
+        {
+            builder.Clear();
+            builder.Append(content);
+            return builder;
+        }
+
+        /// <summary>
+        /// Sets the content to the <see cref="string"/> value. The value is treated as HTML encoded as-provided, and
+        /// no further encoding will be performed.
+        /// </summary>
+        /// <param name="builder">The <see cref="IHtmlContentBuilder"/>.</param>
+        /// <param name="content">The HTML encoded <see cref="string"/> that replaces the content.</param>
+        /// <returns>The <see cref="IHtmlContentBuilder"/>.</returns>
+        public static IHtmlContentBuilder SetContentEncoded(this IHtmlContentBuilder builder, string encoded)
+        {
+            builder.Clear();
+            builder.AppendEncoded(encoded);
+            return builder;
+        }
+
+        [DebuggerDisplay("{DebuggerToString()}")]
+        private class HtmlEncodedString : IHtmlContent
+        {
+            public static readonly IHtmlContent NewLine = new HtmlEncodedString(Environment.NewLine);
+
+            private readonly string _value;
+
+            public HtmlEncodedString(string value)
+            {
+                _value = value;
+            }
+
+            public void WriteTo(TextWriter writer, IHtmlEncoder encoder)
+            {
+                writer.Write(_value);
+            }
+
+            private string DebuggerToString()
+            {
+                using (var writer = new StringWriter())
+                {
+                    WriteTo(writer, HtmlEncoder.Default);
+                    return writer.ToString();
+                }
+            }
+        }
+    }
+}
diff --git a/src/Microsoft.AspNet.Html.Abstractions/IHtmlContentBuilder.cs b/src/Microsoft.AspNet.Html.Abstractions/IHtmlContentBuilder.cs
index 0d558f2006..aea0291e70 100644
--- a/src/Microsoft.AspNet.Html.Abstractions/IHtmlContentBuilder.cs
+++ b/src/Microsoft.AspNet.Html.Abstractions/IHtmlContentBuilder.cs
@@ -19,7 +19,7 @@ namespace Microsoft.AspNet.Html.Abstractions
         /// Appends a <see cref="string"/> value. The value is treated as unencoded as-provided, and will be HTML
         /// encoded before writing to output.
         /// </summary>
-        /// <param name="content">The <see cref="string"/> to append.</param>
+        /// <param name="unencoded">The <see cref="string"/> to append.</param>
         /// <returns>The <see cref="IHtmlContentBuilder"/>.</returns>
         IHtmlContentBuilder Append(string unencoded);
 
@@ -27,7 +27,7 @@ namespace Microsoft.AspNet.Html.Abstractions
         /// Appends an HTML encoded <see cref="string"/> value. The value is treated as HTML encoded as-provided, and
         /// no further encoding will be performed.
         /// </summary>
-        /// <param name="content">The HTML encoded <see cref="string"/> to append.</param>
+        /// <param name="encoded">The HTML encoded <see cref="string"/> to append.</param>
         /// <returns>The <see cref="IHtmlContentBuilder"/>.</returns>
         IHtmlContentBuilder AppendEncoded(string encoded);