diff --git a/src/bunit/Diffing/BlazorDiffingHelpers.cs b/src/bunit/Diffing/BlazorDiffingHelpers.cs
index dab79c95e..605c59173 100644
--- a/src/bunit/Diffing/BlazorDiffingHelpers.cs
+++ b/src/bunit/Diffing/BlazorDiffingHelpers.cs
@@ -7,7 +7,7 @@ namespace Bunit.Diffing;
 /// <summary>
 /// Blazor Diffing Helpers.
 /// </summary>
-public static class BlazorDiffingHelpers
+internal static class BlazorDiffingHelpers
 {
 	/// <summary>
 	/// Represents a diffing filter that removes all special Blazor attributes added by the /<see cref="Htmlizer"/>.
diff --git a/src/bunit/Diffing/DiffMarkupFormatter.cs b/src/bunit/Diffing/DiffMarkupFormatter.cs
index e98fcc5fb..b7e621243 100644
--- a/src/bunit/Diffing/DiffMarkupFormatter.cs
+++ b/src/bunit/Diffing/DiffMarkupFormatter.cs
@@ -7,7 +7,7 @@ namespace Bunit.Diffing;
 /// <summary>
 /// A markup formatter, that skips any special Blazor attributes added by the <see cref="Htmlizer"/>.
 /// </summary>
-public class DiffMarkupFormatter : PrettyMarkupFormatter, IMarkupFormatter
+internal class DiffMarkupFormatter : PrettyMarkupFormatter, IMarkupFormatter
 {
 	/// <summary>
 	/// Initializes a new instance of the <see cref="DiffMarkupFormatter"/> class.
diff --git a/src/bunit/Diffing/HtmlComparer.cs b/src/bunit/Diffing/HtmlComparer.cs
index 9fc2180bc..97bac7138 100644
--- a/src/bunit/Diffing/HtmlComparer.cs
+++ b/src/bunit/Diffing/HtmlComparer.cs
@@ -10,7 +10,7 @@ namespace Bunit.Diffing;
 /// <summary>
 /// Represents a test HTML comparer, that is configured to work with markup generated by the <see cref="BunitRenderer"/> and <see cref="Htmlizer"/> classes.
 /// </summary>
-public sealed class HtmlComparer
+internal sealed class HtmlComparer
 {
 	private readonly HtmlDiffer differenceEngine;
 
diff --git a/src/bunit/Extensions/BlazorExtensions.cs b/src/bunit/Extensions/BlazorExtensions.cs
index daba2f7cf..36b4a5618 100644
--- a/src/bunit/Extensions/BlazorExtensions.cs
+++ b/src/bunit/Extensions/BlazorExtensions.cs
@@ -3,7 +3,7 @@ namespace Bunit.Extensions;
 /// <summary>
 /// Extensions for Blazor types.
 /// </summary>
-public static class BlazorExtensions
+internal static class BlazorExtensions
 {
 	/// <summary>
 	/// Creates a <see cref="RenderFragment"/> that will render the <paramref name="markup"/>.
diff --git a/src/bunit/Extensions/BunitServiceProviderExtensions.cs b/src/bunit/Extensions/BunitServiceProviderExtensions.cs
index 4b89b03bb..f59dbbe82 100644
--- a/src/bunit/Extensions/BunitServiceProviderExtensions.cs
+++ b/src/bunit/Extensions/BunitServiceProviderExtensions.cs
@@ -12,7 +12,7 @@ namespace Bunit.Extensions;
 /// <summary>
 /// Helper methods for correctly registering test dependencies.
 /// </summary>
-public static class BunitServiceProviderExtensions
+internal static class BunitServiceProviderExtensions
 {
 	/// <summary>
 	/// Registers the default services required by the web <see cref="BunitContext"/>.
diff --git a/src/bunit/Extensions/NodePrintExtensions.cs b/src/bunit/Extensions/NodePrintExtensions.cs
index 76b34822b..3613271ad 100644
--- a/src/bunit/Extensions/NodePrintExtensions.cs
+++ b/src/bunit/Extensions/NodePrintExtensions.cs
@@ -10,7 +10,7 @@ namespace Bunit;
 /// <summary>
 /// Helper methods for pretty printing markup from <see cref="INode"/> and <see cref="INodeList"/>.
 /// </summary>
-public static class NodePrintExtensions
+internal static class NodePrintExtensions
 {
 	/// <summary>
 	/// Writes the serialization of the node guided by the formatter.
@@ -28,21 +28,6 @@ public static void ToHtml(this IEnumerable<INode> nodes, TextWriter writer, IMar
 		}
 	}
 
-	/// <summary>
-	/// Uses the <see cref="DiffMarkupFormatter"/> to generate a HTML markup string
-	/// from a <see cref="IEnumerable{INode}"/> <paramref name="nodes"/>.
-	/// The generated HTML markup will NOT include the internal Blazor attributes
-	/// added to elements.
-	/// </summary>
-	public static string ToDiffMarkup(this IEnumerable<INode> nodes)
-	{
-		ArgumentNullException.ThrowIfNull(nodes);
-
-		using var sw = new StringWriter();
-		nodes.ToHtml(sw, new DiffMarkupFormatter());
-		return sw.ToString();
-	}
-
 	/// <summary>
 	/// Uses the <see cref="DiffMarkupFormatter"/> to generate a HTML markup string
 	/// from a <see cref="IMarkupFormattable"/> <paramref name="markupFormattable"/>.
@@ -58,42 +43,6 @@ public static string ToDiffMarkup(this IMarkupFormattable markupFormattable)
 		return sw.ToString();
 	}
 
-	/// <summary>
-	/// Uses the <see cref="PrettyMarkupFormatter"/> to generate a HTML markup string
-	/// from a <see cref="IEnumerable{INode}"/> <paramref name="nodes"/>.
-	/// </summary>
-	public static string ToMarkup(this IEnumerable<INode> nodes)
-	{
-		ArgumentNullException.ThrowIfNull(nodes);
-
-		using var sw = new StringWriter();
-		var formatter = new PrettyMarkupFormatter
-		{
-			NewLine = Environment.NewLine,
-			Indentation = "  ",
-		};
-		nodes.ToHtml(sw, formatter);
-		return sw.ToString();
-	}
-
-	/// <summary>
-	/// Uses the <see cref="PrettyMarkupFormatter"/> to generate a HTML markup
-	/// from a <see cref="IMarkupFormattable"/> <paramref name="markupFormattable"/>.
-	/// </summary>
-	public static string ToMarkup(this IMarkupFormattable markupFormattable)
-	{
-		ArgumentNullException.ThrowIfNull(markupFormattable);
-
-		using var sw = new StringWriter();
-		var formatter = new PrettyMarkupFormatter
-		{
-			NewLine = Environment.NewLine,
-			Indentation = "  ",
-		};
-		markupFormattable.ToHtml(sw, formatter);
-		return sw.ToString();
-	}
-
 	/// <summary>
 	/// Converts an <see cref="IElement"/> into a HTML markup string,
 	/// with only its tag and attributes included in the output. All
diff --git a/src/bunit/Rendering/BunitHtmlParser.cs b/src/bunit/Rendering/BunitHtmlParser.cs
index c2a41e18b..133e31edb 100644
--- a/src/bunit/Rendering/BunitHtmlParser.cs
+++ b/src/bunit/Rendering/BunitHtmlParser.cs
@@ -11,7 +11,7 @@ namespace Bunit.Rendering;
 /// A AngleSharp based HTML Parse that can parse markup strings
 /// into a <see cref="INodeList"/>.
 /// </summary>
-public sealed class BunitHtmlParser : IDisposable
+internal sealed class BunitHtmlParser : IDisposable
 {
 	private const string TbodySubElements = "TR";
 	private const string ColgroupSubElement = "COL";