add browser support

_examples/browser/.gitignore

@@ -0,0 +1,3 @@
+public/build
+node_modules
+.wrangler

_examples/browser/README.md

@@ -0,0 +1,24 @@
+# browser example
+
+* This example demonstrates running a Go HTTP server within the browser.
+  - It's just a static page.
+* It showcases calculating the sum of two numbers, with the result rendered inside an iframe.
+
+## Demo
+
+* https://browser-example.syumai.workers.dev
+
+## Requirements
+
+- Node.js
+- Go 1.24.0 or later
+
+## Development
+
+### Commands
+
+```
+make dev    # run dev server
+make build  # build Go Wasm binary
+make deploy # deploy static assets
+```

_examples/browser/go.mod

@@ -0,0 +1,7 @@
+module github.com/syumai/workers/_examples/browser
+
+go 1.24.0
+
+require github.com/syumai/workers v0.0.0
+
+replace github.com/syumai/workers => ../../

_examples/browser/main.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/syumai/workers"
+)
+
+type AddRequest struct {
+	A int `json:"a"`
+	B int `json:"b"`
+}
+
+func main() {
+	http.HandleFunc("POST /add", func(w http.ResponseWriter, req *http.Request) {
+		var addReq AddRequest
+		if err := json.NewDecoder(req.Body).Decode(&addReq); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+		result := addReq.A + addReq.B
+		if err := json.NewEncoder(w).Encode(result); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+	})
+	workers.Serve(nil)
+}