diff --git a/main_test.go b/main_test.go
index 09fe9628..30fb4e65 100644
--- a/main_test.go
+++ b/main_test.go
@@ -1,3 +1,6 @@
+//go:build !tinygo
+// +build !tinygo
+
 package main_test
 
 import (
diff --git a/wasm/grol_wasm.html b/wasm/grol_wasm.html
index dfb166fb..c8e46a58 100644
--- a/wasm/grol_wasm.html
+++ b/wasm/grol_wasm.html
@@ -73,6 +73,7 @@
             if (output && output.result !== undefined) {
                 // Write the result to the output textarea
                 document.getElementById('output').value = output.result;
+                document.getElementById('input').value = output.formatted;
                 document.getElementById('errors').value = output.errors.join("\n");
             } else {
                 document.getElementById('errors').value = "Unexpected runtime error, see JS console";
@@ -85,6 +86,7 @@
         } finally {
             inst = await WebAssembly.instantiate(mod, go.importObject); // reset instance
         }
+        resizeTextarea(document.getElementById('input'));
         resizeTextarea(document.getElementById('output'));
         resizeTextarea(document.getElementById('errors'));
     }
@@ -102,21 +104,25 @@
     <label for="input">Edit the sample/Enter your GROL code here:</label>
     <textarea id="input" rows="12" cols="80">
 print("Outputting a smiley: 😀\n")
-fact=func(n) { // function
-log("called fact ", n) // log output
+// function example:
+fact=func(n) {
+// log output
+log("called fact ", n)
 if (n<=1) {
     return 1
 }
-n*fact(n-1) // recursion
+// recursion
+n*fact(n-1)
 }
-
-a=[fact(5), "abc", 76-3] // heterogeneous array
-m={"str key": a, 42: "str val"} // maps also can have any key,value types
+// heterogeneous array
+a=[fact(5), "abc", 76-3]
+// maps also can have any key,value types
+m={"str key": a, 42: "str val"}
 </textarea>
 </div>
 <div>
 
-    Hit enter or click <button onClick="run();" id="runButton" disabled>Run</button>
+    Hit enter or click <button onClick="run();" id="runButton" disabled>Run</button> (will also format the code)
 </div>
 <div>
     <label for="output">Result:</label>
diff --git a/wasm/wasm_main.go b/wasm/wasm_main.go
index 84f7b48f..edde5984 100644
--- a/wasm/wasm_main.go
+++ b/wasm/wasm_main.go
@@ -22,7 +22,7 @@ func jsEval(this js.Value, args []js.Value) interface{} {
 		return "ERROR: number of arguments doesn't match"
 	}
 	input := args[0].String()
-	res, errs := repl.EvalString(input)
+	res, errs, formatted := repl.EvalString(input)
 	result := make(map[string]any)
 	result["result"] = res
 	// transfer errors to []any (!)
@@ -31,6 +31,7 @@ func jsEval(this js.Value, args []js.Value) interface{} {
 		anyErrs[i] = v
 	}
 	result["errors"] = anyErrs
+	result["formatted"] = formatted
 	return result
 }