diff --git a/internal/opengl/context_js.go b/internal/opengl/context_js.go
index 01f2ee7b0..27e686e94 100644
--- a/internal/opengl/context_js.go
+++ b/internal/opengl/context_js.go
@@ -21,8 +21,6 @@ import (
 	"fmt"
 
 	"github.com/gopherjs/gopherwasm/js"
-
-	"github.com/hajimehoshi/ebiten/internal/web"
 )
 
 type (
@@ -118,10 +116,6 @@ type context struct {
 }
 
 func Init() error {
-	if web.IsNodeJS() {
-		return fmt.Errorf("opengl: Node.js is not supported")
-	}
-
 	if js.Global.Get("WebGLRenderingContext") == js.Undefined {
 		return fmt.Errorf("opengl: WebGL is not supported")
 	}
diff --git a/internal/ui/ui_js.go b/internal/ui/ui_js.go
index 3b6551a5d..5c16f1050 100644
--- a/internal/ui/ui_js.go
+++ b/internal/ui/ui_js.go
@@ -26,7 +26,6 @@ import (
 	"github.com/hajimehoshi/ebiten/internal/hooks"
 	"github.com/hajimehoshi/ebiten/internal/input"
 	"github.com/hajimehoshi/ebiten/internal/opengl"
-	"github.com/hajimehoshi/ebiten/internal/web"
 )
 
 var canvas js.Value
@@ -227,10 +226,6 @@ func (u *userInterface) loop(g GraphicsContext) error {
 }
 
 func init() {
-	// Do nothing in node.js.
-	if web.IsNodeJS() {
-		return
-	}
 	if document.Get("body") == js.Null {
 		ch := make(chan struct{})
 		window.Call("addEventListener", "load", js.NewCallback(func([]js.Value) {
diff --git a/internal/web/js.go b/internal/web/js.go
index b12edbcd1..6fc5d15ab 100644
--- a/internal/web/js.go
+++ b/internal/web/js.go
@@ -28,21 +28,11 @@ var (
 	isNodeJS     = false
 )
 
-func IsNodeJS() bool {
-	isNodeJSOnce.Do(func() {
-		isNodeJS = js.Global.Get("process") != js.Undefined
-	})
-	return isNodeJS
-}
-
 func IsBrowser() bool {
-	return !IsNodeJS()
+	return true
 }
 
 func IsIOSSafari() bool {
-	if IsNodeJS() {
-		return false
-	}
 	ua := js.Global.Get("navigator").Get("userAgent").String()
 	if !strings.Contains(ua, "iPhone") {
 		return false
@@ -51,9 +41,6 @@ func IsIOSSafari() bool {
 }
 
 func IsAndroidChrome() bool {
-	if IsNodeJS() {
-		return false
-	}
 	ua := js.Global.Get("navigator").Get("userAgent").String()
 	if !strings.Contains(ua, "Android") {
 		return false
diff --git a/internal/web/notjs.go b/internal/web/notjs.go
index d3b61ca56..65fd6cd89 100644
--- a/internal/web/notjs.go
+++ b/internal/web/notjs.go
@@ -16,10 +16,6 @@
 
 package web
 
-func IsNodeJS() bool {
-	return false
-}
-
 func IsBrowser() bool {
 	return false
 }