diff --git a/extensions/vscode-colorize-tests/src/colorizerTestMain.ts b/extensions/vscode-colorize-tests/src/colorizerTestMain.ts
index 7f30a330ffb..9586fc0bb97 100644
--- a/extensions/vscode-colorize-tests/src/colorizerTestMain.ts
+++ b/extensions/vscode-colorize-tests/src/colorizerTestMain.ts
@@ -8,11 +8,13 @@ import * as jsoncParser from 'jsonc-parser';
 
 export function activate(context: vscode.ExtensionContext): any {
 
-	const tokenTypes = ['type', 'struct', 'class', 'interface', 'enum', 'parameterType', 'function', 'variable'];
-	const tokenModifiers = ['static', 'abstract', 'deprecated', 'declaration', 'documentation', 'member', 'async'];
+	const tokenTypes = ['type', 'struct', 'class', 'interface', 'enum', 'parameterType', 'function', 'variable', 'testToken'];
+	const tokenModifiers = ['static', 'abstract', 'deprecated', 'declaration', 'documentation', 'member', 'async', 'testModifier'];
 
 	const legend = new vscode.SemanticTokensLegend(tokenTypes, tokenModifiers);
 
+	const outputChannel = vscode.window.createOutputChannel('Semantic Tokens Test');
+
 	const semanticHighlightProvider: vscode.SemanticTokensProvider = {
 		provideSemanticTokens(document: vscode.TextDocument): vscode.ProviderResult<vscode.SemanticTokens> {
 			const builder = new vscode.SemanticTokensBuilder();
@@ -35,8 +37,13 @@ export function activate(context: vscode.ExtensionContext): any {
 
 
 				builder.push(startLine, startCharacter, length, tokenType, tokenModifiers);
+
+				const selectedModifiers = legend.tokenModifiers.filter((_val, bit) => tokenModifiers & (1 << bit)).join(' ');
+				outputChannel.appendLine(`line: ${startLine}, character: ${startCharacter}, length ${length}, ${legend.tokenTypes[tokenType]} (${tokenType}), ${selectedModifiers} ${tokenModifiers.toString(2)}`);
 			}
 
+			outputChannel.appendLine('---');
+
 			const visitor: jsoncParser.JSONVisitor = {
 				onObjectProperty: (property: string, _offset: number, _length: number, startLine: number, startCharacter: number) => {
 					addToken(property, startLine, startCharacter, property.length + 2);
diff --git a/extensions/vscode-colorize-tests/test/semantic-test/.vscode/settings.json b/extensions/vscode-colorize-tests/test/semantic-test/.vscode/settings.json
new file mode 100644
index 00000000000..c91ebc862e9
--- /dev/null
+++ b/extensions/vscode-colorize-tests/test/semantic-test/.vscode/settings.json
@@ -0,0 +1,13 @@
+{
+    "editor.tokenColorCustomizationsExperimental": {
+        "class": "#00b0b0",
+        "interface": "#845faf",
+        "function": "#ff00ff",
+        "*.declaration": {
+            "fontStyle": "underline"
+        },
+        "*.declaration.member": {
+            "fontStyle": "italic bold",
+        }
+    }
+}
\ No newline at end of file
diff --git a/extensions/vscode-colorize-tests/test/semantic-test/semantic-test.json b/extensions/vscode-colorize-tests/test/semantic-test/semantic-test.json
new file mode 100644
index 00000000000..b250b5d2bc1
--- /dev/null
+++ b/extensions/vscode-colorize-tests/test/semantic-test/semantic-test.json
@@ -0,0 +1,9 @@
+[
+	"class", "function.member.declaration",
+			"parameterType.declaration",  "type", "parameterType.declaration", "type",
+				"variable.declaration", "parameterNames",
+		"function.member.declaration",
+	"interface.declaration",
+		"function.member.declaration", "testToken.testModifier"
+
+]