diff --git a/src/backend/document/document.go b/src/backend/document/document.go
index c541147..790162e 100644
--- a/src/backend/document/document.go
+++ b/src/backend/document/document.go
@@ -72,6 +72,14 @@ func (d *documentElement) ClientHeight() js.Value {
 	return js.Global().Get("document").Get("documentElement").Get("clientHeight")
 }
 
+func (d *documentElement) ClientIntWidth() int {
+	return js.Global().Get("document").Get("documentElement").Get("clientWidth").Int()
+}
+
+func (d *documentElement) ClientIntHeight() int {
+	return js.Global().Get("document").Get("documentElement").Get("clientHeight").Int()
+}
+
 func (d *styleDocument) Set(key string, value interface{}) {
 	js.Global().Get("document").Get("documentElement").Get("style").Set(key, value)
 }
diff --git a/src/webzen/init.go b/src/webzen/init.go
index 1333463..f187bc7 100644
--- a/src/webzen/init.go
+++ b/src/webzen/init.go
@@ -47,7 +47,32 @@ func Init() {
 	keys.SetupEventListeners()
 }
 
+func CustomInit(width, height int) {
+	canvas := document.GetElementById("webzen")
+	if canvas.IsNull() {
+		canvas = document.CreateCanvasElement()
+		canvas.Set("id", "canvas")
+		document.Body.AppendCanvasChild(canvas)
+	}
+
+	canvas.Set("width", width)
+	canvas.Set("height", height)
+
+	document.DocumentElement.Style.Set("overflow", "hidden")
+	document.Body.Style.Set("overflow", "hidden")
+
+	keys.SetupEventListeners()
+}
+
 func Update() {
 	time.Sleep(time.Millisecond * 16)
 	clearCanvas()
 }
+
+func GetWidth() int {
+	return document.DocumentElement.ClientIntWidth()
+}
+
+func GetHeight() int {
+	return document.DocumentElement.ClientIntHeight()
+}