add Playwright-powered HtmlKernel

src/dotnet-repl/HtmlKernel.cs

@@ -0,0 +1,25 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Threading.Tasks;
+using Microsoft.DotNet.Interactive;
+using Microsoft.DotNet.Interactive.Commands;
+
+namespace dotnet_repl;
+
+public class HtmlKernel : Kernel, IKernelCommandHandler<SubmitCode>
+{
+    private readonly Kernel _innerJsKernel;
+
+    public HtmlKernel(Kernel innerJsKernel) : base("html", "HTML", "5.0")
+    {
+        _innerJsKernel = innerJsKernel;
+    }
+
+    public async Task HandleAsync(SubmitCode command, KernelInvocationContext context)
+    {
+        var jsCode = $"await dotnetInteractive.domHtmlFragmentProcessor('{command.Code}');";
+
+        await _innerJsKernel.SendAsync(new SubmitCode(jsCode));
+    }
+}

src/dotnet-repl/KernelBuilder.cs

@@ -78,6 +78,8 @@ public static CompositeKernel CreateKernel(StartupOptions? options = null)
 
         var playwrightKernel = Task.Run(() => new PlaywrightKernelConnector().CreateKernelAsync("javascript")).Result;
         compositeKernel.Add(playwrightKernel, new[] { "js" });
+        playwrightKernel.KernelInfo.SupportedKernelCommands.Add(new KernelCommandInfo("SubmitCode"));
+        compositeKernel.Add(new HtmlKernel(playwrightKernel));
         compositeKernel.Add(new MarkdownKernel());
         compositeKernel.Add(new SqlDiscoverabilityKernel());
         compositeKernel.Add(new KqlDiscoverabilityKernel());

src/dotnet-repl/KernelSpecificTheme.cs

@@ -37,6 +37,7 @@ public abstract class KernelSpecificTheme : Theme
         "pwsh" => new PowerShellTheme(),
         "javascript" => new JavaScriptTheme(),
         "sql" => new SqlTheme(),
+        "html" => new HtmlTheme(),
         _ => null
     };
 }
@@ -73,6 +74,15 @@ public class JavaScriptTheme : KernelSpecificTheme
     public override string PromptText => "JS";
 }
 
+public class HtmlTheme : KernelSpecificTheme
+{
+    public override Style AccentStyle => new(Color.Red3);
+
+    public override string KernelDisplayName => "HTML";
+
+    public override string PromptText => "HTML";
+}
+
 public class SqlTheme : KernelSpecificTheme
 {
     public override Style AccentStyle => new(Color.Yellow3);