diff --git a/.gitignore b/.gitignore
index ea99eb3..6372ffa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
-./intermediate.wat
-./output.wasmu
+intermediate.wat
+output.wasm
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..8cabda6
--- /dev/null
+++ b/index.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <body>
+    <script type="text/javascript">
+      WebAssembly.instantiateStreaming(fetch("./output.wasm"), {
+        wasi_unstable: {
+          proc_exit: (i) => {throw new Error('err ' + i)},
+          fd_write: (a, b, c, d) => console.log('writing something')
+        }
+      })
+        .then(({instance}) => {
+          window.runWasm = () => {
+            debugger
+            instance.exports._start()
+          }
+        })
+    </script>
+    <button onClick="javascript:runWasm()">run wasm</button>
+  </body>
+</html>
