diff --git a/lib/pixi/resolution.html b/lib/pixi/resolution.html
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--- /dev/null
+++ b/lib/pixi/resolution.html
@@ -0,0 +1,98 @@
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+
+        <title>PIXI Resolution Doctest</title>
+
+        <script src="../../dist/iwmlib.3rdparty.js"></script>
+        <script src="../../dist/iwmlib.js"></script>
+        <script src="../../dist/iwmlib.pixi.js"></script>
+
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/mousetrap/1.6.5/mousetrap.min.js"></script>
+
+        <style>
+            body {
+                padding: 0;
+                margin: 0;
+                width: 100%;
+                height: 100%;
+            }
+        </style>
+    </head>
+    <body>
+        <canvas id="canvas"></canvas>
+
+        <script class="doctest">
+            const app = new PIXIApp({
+                view: canvas,
+                fpsLogging: true,
+                transparent: false
+            })
+
+            app.setup()
+            app.run()
+
+            const textProps = {fontSize: 72, fill: 0xffffff}
+
+            Mousetrap.bind(['1', '2', '3', '4'], (event, key) => {
+
+                app.stage.removeChildren()
+
+                let sprite = null
+                let label = null
+
+                if (key === '1') {
+                    sprite = PIXI.Sprite.from('resolution/image-4k.jpg')
+                    label = `4096 * 2732 ~ 4K`
+                } else if (key === '2') {
+                    sprite = PIXI.Sprite.from('resolution/image-8k.jpg')
+                    label = `7952 * 5304 ~ 8K`
+                } else if (key === '3') {
+                    const texture = PIXI.Texture.from('resolution/video-1k.mp4')
+                    texture.baseTexture.resource.source.loop = true
+                    sprite = new PIXI.Sprite(texture)
+                    label = `1920 * 1080 = 1K`
+                } else if (key === '4') {
+                    const texture = PIXI.Texture.from('resolution/video-4k.mp4')
+                    texture.baseTexture.resource.source.loop = true
+                    sprite = new PIXI.Sprite(texture)
+                    label = `3840 * 2160 = 4K`
+                } else if (key === '5') {
+                    const texture = PIXI.Texture.from('resolution/video-8k.mp4')
+                    texture.baseTexture.resource.source.loop = true
+                    sprite = new PIXI.Sprite(texture)
+                    label = `7680 * 4320 ~ 8K`
+                }
+
+                app.stage.addChild(sprite)
+
+                // texts
+                //--------------------
+                const width = new PIXI.Text(`Width: ${app.renderer.width}`, textProps)
+                width.x = 100
+                width.y = 100
+
+                const height = new PIXI.Text(`Height: ${app.renderer.height}`, textProps)
+                height.x = 100
+                height.y = width.y + width.height + 10
+
+                const resolution = new PIXI.Text(`Resolution: ${app.renderer.resolution}`, textProps)
+                resolution.x = 100
+                resolution.y = height.y + height.height + 10
+
+                const devicePixelRatio = new PIXI.Text(`devicePixelRatio: ${window.devicePixelRatio}`, textProps)
+                devicePixelRatio.x = 100
+                devicePixelRatio.y = resolution.y + resolution.height + 10
+
+                const text = new PIXI.Text(label, textProps)
+                text.x = 100
+                text.y = devicePixelRatio.y + devicePixelRatio.height * 2
+
+                app.stage.addChild(width, height, resolution, devicePixelRatio, text)
+            })
+
+            Mousetrap.trigger('1')
+        </script>
+    </body>
+</html>
diff --git a/lib/pixi/resolution/image-4k.jpg b/lib/pixi/resolution/image-4k.jpg
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diff --git a/lib/pixi/resolution/image-8k.jpg b/lib/pixi/resolution/image-8k.jpg
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diff --git a/lib/pixi/resolution/video-1k.mp4 b/lib/pixi/resolution/video-1k.mp4
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diff --git a/lib/pixi/resolution/video-4k.mp4 b/lib/pixi/resolution/video-4k.mp4
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diff --git a/lib/pixi/resolution/video-8k.mp4 b/lib/pixi/resolution/video-8k.mp4
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index 0000000..d963b24
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