diff --git a/package-lock.json b/package-lock.json
index 77bd92ca..b0d65ed0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@next2d/player",
-  "version": "2.10.0",
+  "version": "2.12.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@next2d/player",
-      "version": "2.10.0",
+      "version": "2.12.0",
       "license": "MIT",
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@@ -23,9 +23,9 @@
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-        "@typescript-eslint/parser": "^8.47.0",
-        "@vitest/web-worker": "^4.0.12",
+        "@typescript-eslint/eslint-plugin": "^8.48.0",
+        "@typescript-eslint/parser": "^8.48.0",
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@@ -34,7 +34,7 @@
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         "vite": "^7.2.4",
-        "vitest": "^4.0.12",
+        "vitest": "^4.0.13",
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@@ -980,44 +980,6 @@
       "resolved": "packages/webgl",
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-      "license": "MIT",
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+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.48.0.tgz",
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-        "@typescript-eslint/utils": "8.47.0",
-        "@typescript-eslint/visitor-keys": "8.47.0",
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@@ -1532,7 +1494,7 @@
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       },
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+        "@typescript-eslint/parser": "^8.48.0",
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+        "@typescript-eslint/typescript-estree": "8.48.0",
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@@ -1573,14 +1535,14 @@
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+      "resolved": "https://registry.npmjs.org/@typescript-eslint/project-service/-/project-service-8.48.0.tgz",
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-        "@typescript-eslint/tsconfig-utils": "^8.47.0",
-        "@typescript-eslint/types": "^8.47.0",
+        "@typescript-eslint/tsconfig-utils": "^8.48.0",
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@@ -1595,14 +1557,14 @@
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+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-8.48.0.tgz",
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-        "@typescript-eslint/visitor-keys": "8.47.0"
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@@ -1613,9 +1575,9 @@
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@@ -1630,15 +1592,15 @@
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-        "@typescript-eslint/typescript-estree": "8.47.0",
-        "@typescript-eslint/utils": "8.47.0",
+        "@typescript-eslint/types": "8.48.0",
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@@ -1655,9 +1617,9 @@
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@@ -1669,21 +1631,20 @@
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-        "@typescript-eslint/visitor-keys": "8.47.0",
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         "minimatch": "^9.0.4",
         "semver": "^7.6.0",
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@@ -1724,16 +1685,16 @@
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@@ -1748,13 +1709,13 @@
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       "license": "MIT",
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@@ -1779,16 +1740,16 @@
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-        "@vitest/spy": "4.0.12",
-        "@vitest/utils": "4.0.12",
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@@ -1797,13 +1758,13 @@
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@@ -1834,9 +1795,9 @@
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       "license": "MIT",
       "dependencies": {
-        "@vitest/utils": "4.0.12",
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@@ -1861,13 +1822,13 @@
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       "license": "MIT",
       "dependencies": {
-        "@vitest/pretty-format": "4.0.12",
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@@ -1876,9 +1837,9 @@
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     "node_modules/@vitest/spy": {
-      "version": "4.0.12",
-      "resolved": "https://registry.npmjs.org/@vitest/spy/-/spy-4.0.12.tgz",
-      "integrity": "sha512-GZjI9PPhiOYNX8Nsyqdw7JQB+u0BptL5fSnXiottAUBHlcMzgADV58A7SLTXXQwcN1yZ6gfd1DH+2bqjuUlCzw==",
+      "version": "4.0.13",
+      "resolved": "https://registry.npmjs.org/@vitest/spy/-/spy-4.0.13.tgz",
+      "integrity": "sha512-hSu+m4se0lDV5yVIcNWqjuncrmBgwaXa2utFLIrBkQCQkt+pSwyZTPFQAZiiF/63j8jYa8uAeUZ3RSfcdWaYWw==",
       "dev": true,
       "license": "MIT",
       "funding": {
@@ -1886,13 +1847,13 @@
       }
     },
     "node_modules/@vitest/utils": {
-      "version": "4.0.12",
-      "resolved": "https://registry.npmjs.org/@vitest/utils/-/utils-4.0.12.tgz",
-      "integrity": "sha512-DVS/TLkLdvGvj1avRy0LSmKfrcI9MNFvNGN6ECjTUHWJdlcgPDOXhjMis5Dh7rBH62nAmSXnkPbE+DZ5YD75Rw==",
+      "version": "4.0.13",
+      "resolved": "https://registry.npmjs.org/@vitest/utils/-/utils-4.0.13.tgz",
+      "integrity": "sha512-ydozWyQ4LZuu8rLp47xFUWis5VOKMdHjXCWhs1LuJsTNKww+pTHQNK4e0assIB9K80TxFyskENL6vCu3j34EYA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@vitest/pretty-format": "4.0.12",
+        "@vitest/pretty-format": "4.0.13",
         "tinyrainbow": "^3.0.3"
       },
       "funding": {
@@ -1900,9 +1861,9 @@
       }
     },
     "node_modules/@vitest/web-worker": {
-      "version": "4.0.12",
-      "resolved": "https://registry.npmjs.org/@vitest/web-worker/-/web-worker-4.0.12.tgz",
-      "integrity": "sha512-Ry28B/ZbeHRgrNbJEZMCwgjerOUFESV/u8l8ZPiEZ4SEtevG0qCeG0DDNaxK2PMYmwdjz9JKxEZOPqT6jBRqDw==",
+      "version": "4.0.13",
+      "resolved": "https://registry.npmjs.org/@vitest/web-worker/-/web-worker-4.0.13.tgz",
+      "integrity": "sha512-LLkq30B6inJ5E6KxXjfcHhL1MT/bdk50Y22BjHFEwPzG3WteDvH0OQorqX6GaYgHEfCJAD665nOajnayWQsdtg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -1912,7 +1873,7 @@
         "url": "https://opencollective.com/vitest"
       },
       "peerDependencies": {
-        "vitest": "4.0.12"
+        "vitest": "4.0.13"
       }
     },
     "node_modules/acorn": {
@@ -2026,19 +1987,6 @@
         "concat-map": "0.0.1"
       }
     },
-    "node_modules/braces": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.3.tgz",
-      "integrity": "sha512-yQbXgO/OSZVD2IsiLlro+7Hf6Q18EJrKSEsdoMzKePKXct3gvD8oLcOQdIzGupr5Fj+EDe8gO/lxc1BzfMpxvA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "fill-range": "^7.1.1"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/buffer-from": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.2.tgz",
@@ -2592,36 +2540,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/fast-glob": {
-      "version": "3.3.3",
-      "resolved": "https://registry.npmjs.org/fast-glob/-/fast-glob-3.3.3.tgz",
-      "integrity": "sha512-7MptL8U0cqcFdzIzwOTHoilX9x5BrNqye7Z/LuC7kCMRio1EMSyqRK3BEAUD7sXRq4iT4AzTVuZdhgQ2TCvYLg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@nodelib/fs.stat": "^2.0.2",
-        "@nodelib/fs.walk": "^1.2.3",
-        "glob-parent": "^5.1.2",
-        "merge2": "^1.3.0",
-        "micromatch": "^4.0.8"
-      },
-      "engines": {
-        "node": ">=8.6.0"
-      }
-    },
-    "node_modules/fast-glob/node_modules/glob-parent": {
-      "version": "5.1.2",
-      "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-5.1.2.tgz",
-      "integrity": "sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "is-glob": "^4.0.1"
-      },
-      "engines": {
-        "node": ">= 6"
-      }
-    },
     "node_modules/fast-json-stable-stringify": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz",
@@ -2636,16 +2554,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/fastq": {
-      "version": "1.19.1",
-      "resolved": "https://registry.npmjs.org/fastq/-/fastq-1.19.1.tgz",
-      "integrity": "sha512-GwLTyxkCXjXbxqIhTsMI2Nui8huMPtnxg7krajPJAjnEG/iiOS7i+zCtWGZR9G0NBKbXKh6X9m9UIsYX/N6vvQ==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "reusify": "^1.0.4"
-      }
-    },
     "node_modules/fdir": {
       "version": "6.5.0",
       "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
@@ -2683,19 +2591,6 @@
         "node": ">=16.0.0"
       }
     },
-    "node_modules/fill-range": {
-      "version": "7.1.1",
-      "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.1.1.tgz",
-      "integrity": "sha512-YsGpe3WHLK8ZYi4tWDg2Jy3ebRz2rXowDxnld4bkQB00cc/1Zw9AWnC0i9ztDJitivtQvaI9KaLyKrc+hBW0yg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "to-regex-range": "^5.0.1"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/find-up": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/find-up/-/find-up-5.0.0.tgz",
@@ -2971,16 +2866,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/is-number": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/is-number/-/is-number-7.0.0.tgz",
-      "integrity": "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=0.12.0"
-      }
-    },
     "node_modules/is-potential-custom-element-name": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/is-potential-custom-element-name/-/is-potential-custom-element-name-1.0.1.tgz",
@@ -3153,43 +3038,6 @@
       "dev": true,
       "license": "CC0-1.0"
     },
-    "node_modules/merge2": {
-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/merge2/-/merge2-1.4.1.tgz",
-      "integrity": "sha512-8q7VEgMJW4J8tcfVPy8g09NcQwZdbwFEqhe/WZkoIzjn/3TGDwtOCYtXGxA3O8tPzpczCCDgv+P2P5y00ZJOOg==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">= 8"
-      }
-    },
-    "node_modules/micromatch": {
-      "version": "4.0.8",
-      "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-4.0.8.tgz",
-      "integrity": "sha512-PXwfBhYu0hBCPw8Dn0E+WDYb7af3dSLVWKi3HGv84IdF4TyFoC0ysxFd0Goxw7nSv4T/PzEJQxsYsEiFCKo2BA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "braces": "^3.0.3",
-        "picomatch": "^2.3.1"
-      },
-      "engines": {
-        "node": ">=8.6"
-      }
-    },
-    "node_modules/micromatch/node_modules/picomatch": {
-      "version": "2.3.1",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.1.tgz",
-      "integrity": "sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=8.6"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/jonschlinkert"
-      }
-    },
     "node_modules/minimatch": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
@@ -3431,27 +3279,6 @@
         "node": ">=6"
       }
     },
-    "node_modules/queue-microtask": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/queue-microtask/-/queue-microtask-1.2.3.tgz",
-      "integrity": "sha512-NuaNSa6flKT5JaSYQzJok04JzTL1CA6aGhv5rfLW3PgqA+M2ChpZQnAC8h8i4ZFkBS8X5RqkDBHA7r4hej3K9A==",
-      "dev": true,
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/feross"
-        },
-        {
-          "type": "patreon",
-          "url": "https://www.patreon.com/feross"
-        },
-        {
-          "type": "consulting",
-          "url": "https://feross.org/support"
-        }
-      ],
-      "license": "MIT"
-    },
     "node_modules/randombytes": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/randombytes/-/randombytes-2.1.0.tgz",
@@ -3503,17 +3330,6 @@
         "node": ">=4"
       }
     },
-    "node_modules/reusify": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/reusify/-/reusify-1.1.0.tgz",
-      "integrity": "sha512-g6QUff04oZpHs0eG5p83rFLhHeV00ug/Yf9nZM6fLeUrPguBTkTQOdpAWWspMh55TZfVQDPaN3NQJfbVRAxdIw==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "iojs": ">=1.0.0",
-        "node": ">=0.10.0"
-      }
-    },
     "node_modules/rollup": {
       "version": "4.53.3",
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.53.3.tgz",
@@ -3556,30 +3372,6 @@
         "fsevents": "~2.3.2"
       }
     },
-    "node_modules/run-parallel": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.2.0.tgz",
-      "integrity": "sha512-5l4VyZR86LZ/lDxZTR6jqL8AFE2S0IFLMP26AbjsLVADxHdhB/c0GUsH+y39UfCi3dzz8OlQuPmnaJOMoDHQBA==",
-      "dev": true,
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/feross"
-        },
-        {
-          "type": "patreon",
-          "url": "https://www.patreon.com/feross"
-        },
-        {
-          "type": "consulting",
-          "url": "https://feross.org/support"
-        }
-      ],
-      "license": "MIT",
-      "dependencies": {
-        "queue-microtask": "^1.2.2"
-      }
-    },
     "node_modules/safe-buffer": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
@@ -3859,19 +3651,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/to-regex-range": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
-      "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "is-number": "^7.0.0"
-      },
-      "engines": {
-        "node": ">=8.0"
-      }
-    },
     "node_modules/tough-cookie": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-6.0.0.tgz",
@@ -4038,19 +3817,19 @@
       }
     },
     "node_modules/vitest": {
-      "version": "4.0.12",
-      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.0.12.tgz",
-      "integrity": "sha512-pmW4GCKQ8t5Ko1jYjC3SqOr7TUKN7uHOHB/XGsAIb69eYu6d1ionGSsb5H9chmPf+WeXt0VE7jTXsB1IvWoNbw==",
+      "version": "4.0.13",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.0.13.tgz",
+      "integrity": "sha512-QSD4I0fN6uZQfftryIXuqvqgBxTvJ3ZNkF6RWECd82YGAYAfhcppBLFXzXJHQAAhVFyYEuFTrq6h0hQqjB7jIQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@vitest/expect": "4.0.12",
-        "@vitest/mocker": "4.0.12",
-        "@vitest/pretty-format": "4.0.12",
-        "@vitest/runner": "4.0.12",
-        "@vitest/snapshot": "4.0.12",
-        "@vitest/spy": "4.0.12",
-        "@vitest/utils": "4.0.12",
+        "@vitest/expect": "4.0.13",
+        "@vitest/mocker": "4.0.13",
+        "@vitest/pretty-format": "4.0.13",
+        "@vitest/runner": "4.0.13",
+        "@vitest/snapshot": "4.0.13",
+        "@vitest/spy": "4.0.13",
+        "@vitest/utils": "4.0.13",
         "debug": "^4.4.3",
         "es-module-lexer": "^1.7.0",
         "expect-type": "^1.2.2",
@@ -4079,10 +3858,10 @@
         "@opentelemetry/api": "^1.9.0",
         "@types/debug": "^4.1.12",
         "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
-        "@vitest/browser-playwright": "4.0.12",
-        "@vitest/browser-preview": "4.0.12",
-        "@vitest/browser-webdriverio": "4.0.12",
-        "@vitest/ui": "4.0.12",
+        "@vitest/browser-playwright": "4.0.13",
+        "@vitest/browser-preview": "4.0.13",
+        "@vitest/browser-webdriverio": "4.0.13",
+        "@vitest/ui": "4.0.13",
         "happy-dom": "*",
         "jsdom": "*"
       },
diff --git a/package.json b/package.json
index f4420788..d5d17d22 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next2d/player",
-  "version": "2.11.0",
+  "version": "2.12.0",
   "description": "Experience the fast and beautiful anti-aliased rendering of WebGL. You can create rich, interactive graphics, cross-platform applications and games without worrying about browser or device compatibility.",
   "author": "Toshiyuki Ienaga<ienaga@next2d.app> (https://github.com/ienaga/)",
   "license": "MIT",
@@ -52,9 +52,9 @@
     "@rollup/plugin-terser": "^0.4.4",
     "@rollup/plugin-typescript": "^12.3.0",
     "@types/node": "^24.10.1",
-    "@typescript-eslint/eslint-plugin": "^8.47.0",
-    "@typescript-eslint/parser": "^8.47.0",
-    "@vitest/web-worker": "^4.0.12",
+    "@typescript-eslint/eslint-plugin": "^8.48.0",
+    "@typescript-eslint/parser": "^8.48.0",
+    "@vitest/web-worker": "^4.0.13",
     "eslint": "^9.39.1",
     "eslint-plugin-unused-imports": "^4.3.0",
     "globals": "^16.5.0",
@@ -63,7 +63,7 @@
     "tslib": "^2.8.1",
     "typescript": "^5.9.3",
     "vite": "^7.2.4",
-    "vitest": "^4.0.12",
+    "vitest": "^4.0.13",
     "vitest-webgl-canvas-mock": "^1.1.0",
     "xml2js": "^0.6.2"
   },
diff --git a/packages/display/src/Stage.test.ts b/packages/display/src/Stage.test.ts
new file mode 100644
index 00000000..23fe6359
--- /dev/null
+++ b/packages/display/src/Stage.test.ts
@@ -0,0 +1,194 @@
+import { Stage, stage } from "./Stage";
+import { Sprite } from "./Sprite";
+import { describe, expect, it, beforeEach } from "vitest";
+
+describe("Stage class test", () =>
+{
+    let testStage: Stage;
+
+    beforeEach(() =>
+    {
+        testStage = new Stage();
+    });
+
+    describe("constructor test", () =>
+    {
+        it("should initialize with default values", () =>
+        {
+            expect(testStage.stageWidth).toBe(0);
+            expect(testStage.stageHeight).toBe(0);
+            expect(testStage.frameRate).toBe(1);
+            expect(testStage.rendererScale).toBe(1);
+            expect(testStage.rendererWidth).toBe(0);
+            expect(testStage.rendererHeight).toBe(0);
+            expect(testStage.backgroundColor).toBe(-1);
+        });
+    });
+
+    describe("backgroundColor property test", () =>
+    {
+        it("should set background color from hex string", () =>
+        {
+            testStage.backgroundColor = "#FF0000";
+            expect(testStage.backgroundColor).toBe(0xFF0000);
+        });
+
+        it("should set background color from hex string without #", () =>
+        {
+            testStage.backgroundColor = "00FF00";
+            expect(testStage.backgroundColor).toBe(0x00FF00);
+        });
+
+        it("should set transparent background color", () =>
+        {
+            testStage.backgroundColor = "transparent";
+            expect(testStage.backgroundColor).toBe(-1);
+        });
+
+        it("should handle white color", () =>
+        {
+            testStage.backgroundColor = "#FFFFFF";
+            expect(testStage.backgroundColor).toBe(0xFFFFFF);
+        });
+
+        it("should handle black color", () =>
+        {
+            testStage.backgroundColor = "#000000";
+            expect(testStage.backgroundColor).toBe(0x000000);
+        });
+    });
+
+    describe("pointer property test", () =>
+    {
+        it("should return pointer object", () =>
+        {
+            const pointer = testStage.pointer;
+            expect(pointer).toBeDefined();
+            expect(typeof pointer).toBe("object");
+        });
+    });
+
+    describe("ready property test", () =>
+    {
+        it("should not set ready when false", () =>
+        {
+            testStage.ready = false;
+            expect(testStage["_$ready"]).toBe(false);
+        });
+
+        it("should set ready to true", () =>
+        {
+            testStage.ready = true;
+            expect(testStage["_$ready"]).toBe(true);
+        });
+
+        it("should not change ready once set to true", () =>
+        {
+            testStage.ready = true;
+            expect(testStage["_$ready"]).toBe(true);
+            
+            testStage.ready = true;
+            expect(testStage["_$ready"]).toBe(true);
+        });
+    });
+
+    describe("addChild method test", () =>
+    {
+        it("should add child to stage", () =>
+        {
+            const sprite = new Sprite();
+            const result = testStage.addChild(sprite);
+            
+            expect(result).toBe(sprite);
+            expect(testStage.numChildren).toBe(1);
+            expect(testStage.getChildAt(0)).toBe(sprite);
+        });
+
+        it("should return the added display object", () =>
+        {
+            const sprite = new Sprite();
+            const returnedSprite = testStage.addChild(sprite);
+            
+            expect(returnedSprite).toBe(sprite);
+        });
+
+        it("should add multiple children", () =>
+        {
+            const sprite1 = new Sprite();
+            const sprite2 = new Sprite();
+            
+            testStage.addChild(sprite1);
+            testStage.addChild(sprite2);
+            
+            expect(testStage.numChildren).toBe(2);
+            expect(testStage.getChildAt(0)).toBe(sprite1);
+            expect(testStage.getChildAt(1)).toBe(sprite2);
+        });
+    });
+
+    describe("stage width and height test", () =>
+    {
+        it("should set and get stageWidth", () =>
+        {
+            testStage.stageWidth = 800;
+            expect(testStage.stageWidth).toBe(800);
+        });
+
+        it("should set and get stageHeight", () =>
+        {
+            testStage.stageHeight = 600;
+            expect(testStage.stageHeight).toBe(600);
+        });
+    });
+
+    describe("frameRate property test", () =>
+    {
+        it("should set and get frameRate", () =>
+        {
+            testStage.frameRate = 60;
+            expect(testStage.frameRate).toBe(60);
+        });
+
+        it("should initialize with frameRate 1", () =>
+        {
+            expect(testStage.frameRate).toBe(1);
+        });
+    });
+
+    describe("renderer properties test", () =>
+    {
+        it("should set and get rendererScale", () =>
+        {
+            testStage.rendererScale = 2;
+            expect(testStage.rendererScale).toBe(2);
+        });
+
+        it("should set and get rendererWidth", () =>
+        {
+            testStage.rendererWidth = 1600;
+            expect(testStage.rendererWidth).toBe(1600);
+        });
+
+        it("should set and get rendererHeight", () =>
+        {
+            testStage.rendererHeight = 1200;
+            expect(testStage.rendererHeight).toBe(1200);
+        });
+    });
+
+    describe("exported stage instance test", () =>
+    {
+        it("should export a stage instance", () =>
+        {
+            expect(stage).toBeDefined();
+            expect(stage).toBeInstanceOf(Stage);
+        });
+
+        it("should have default values", () =>
+        {
+            expect(stage.stageWidth).toBe(0);
+            expect(stage.stageHeight).toBe(0);
+            expect(stage.frameRate).toBe(1);
+        });
+    });
+});
diff --git a/packages/display/src/Stage.ts b/packages/display/src/Stage.ts
index 83ae1bc9..2e9e0d46 100644
--- a/packages/display/src/Stage.ts
+++ b/packages/display/src/Stage.ts
@@ -181,10 +181,14 @@ export class Stage extends DisplayObjectContainer
      */
     addChild<T extends DisplayObject>(display_object: T): T
     {
-        $rootMap.set(display_object, display_object);
         $stageAssignedMap.add(display_object.instanceId);
 
-        return super.addChild(display_object);
+        super.addChild(display_object);
+
+        // fixed logic for root map
+        $rootMap.set(display_object, display_object);
+
+        return display_object;
     }
 
     /**
diff --git a/src/index.ts b/src/index.ts
index f32eb6f2..1a2d103e 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -3,7 +3,7 @@
 import { Next2D } from "@next2d/core";
 
 if (!("next2d" in window)) {
-    console.log("%c Next2D Player %c 2.11.0 %c https://next2d.app",
+    console.log("%c Next2D Player %c 2.12.0 %c https://next2d.app",
         "color: #fff; background: #5f5f5f",
         "color: #fff; background: #4bc729",
         "");