diff --git a/ebiten_test.go b/ebiten_test.go
new file mode 100644
index 000000000..bf0ceb254
--- /dev/null
+++ b/ebiten_test.go
@@ -0,0 +1,32 @@
+// Copyright 2024 The Ebitengine 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.
+
+package ebiten_test
+
+import (
+	"testing"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+func TestScreenSizeInFullscreen(t *testing.T) {
+	// Just call ScreenSizeInFullscreen. There was a crash bug on browsers (#2975).
+	w, h := ebiten.ScreenSizeInFullscreen()
+	if w <= 0 {
+		t.Errorf("w must be positive but not: %d", w)
+	}
+	if h <= 0 {
+		t.Errorf("h must be positive but not: %d", h)
+	}
+}
diff --git a/internal/ui/screensizeinfullscreen_js.go b/internal/ui/screensizeinfullscreen_js.go
index 40ed9b5c0..336400614 100644
--- a/internal/ui/screensizeinfullscreen_js.go
+++ b/internal/ui/screensizeinfullscreen_js.go
@@ -16,5 +16,5 @@ package ui
 
 func (u *UserInterface) ScreenSizeInFullscreen() (int, int) {
 	// On browsers, ScreenSizeInFullscreen returns the 'window' (global object) size, not 'screen' size for backward compatibility (#2145).
-	return window.Get("width").Int(), window.Get("height").Int()
+	return window.Get("innerWidth").Int(), window.Get("innerHeight").Int()
 }