diff --git a/internal/web/mobile.go b/internal/web/js.go
similarity index 89%
rename from internal/web/mobile.go
rename to internal/web/js.go
index c9a2e4f5d..0e323f0fb 100644
--- a/internal/web/mobile.go
+++ b/internal/web/js.go
@@ -44,3 +44,8 @@ func isAndroidChrome() bool {
 func IsMobileBrowser() bool {
 	return isIOS() || isAndroidChrome()
 }
+
+func IsEdgeBrowser() bool {
+	ua := js.Global.Get("navigator").Get("userAgent").String()
+	return strings.Contains(ua, "Edge")
+}
diff --git a/internal/web/notjs.go b/internal/web/notjs.go
new file mode 100644
index 000000000..3250b9ce0
--- /dev/null
+++ b/internal/web/notjs.go
@@ -0,0 +1,25 @@
+// Copyright 2017 The Ebiten Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !js
+
+package web
+
+func IsMobileBrowser() bool {
+	return false
+}
+
+func IsEdgeBrowser() bool {
+	return false
+}