diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index be01b3b..d1523fb 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -1,9 +1,6 @@
 name: Deploy to GitHub Pages
 
 on:
-  push:
-    branches:
-      - main
   workflow_dispatch:
 
 permissions:
diff --git a/.github/workflows/playwright.yml b/.github/workflows/playwright.yml
new file mode 100644
index 0000000..173a7ec
--- /dev/null
+++ b/.github/workflows/playwright.yml
@@ -0,0 +1,61 @@
+name: Playwright
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'src/**'
+      - 'playwright/**'
+      - 'package-lock.json'
+      - 'playwright.config.ts'
+      - '.github/workflows/playwright.yml'
+  workflow_dispatch:
+
+jobs:
+  e2e:
+    name: E2E (Playwright)
+    runs-on: ubuntu-latest
+    timeout-minutes: 25
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6.0.1
+
+      - name: Setup Node
+        uses: actions/setup-node@v6.2.0
+        with:
+          node-version: '24.14.0'
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Check Types
+        run: npm run check-types
+
+      - name: Lint Playwright Files
+        run: npm run lint:playwright
+
+      - name: Install Browsers
+        run: npx playwright install --with-deps chromium webkit
+
+      - name: Run Playwright Tests
+        env:
+          CI: 'true'
+        run: npm run test:e2e
+
+      - name: Upload Playwright report
+        uses: actions/upload-artifact@v6.0.0
+        if: ${{ failure() }}
+        with:
+          name: playwright-report
+          path: playwright-report
+          if-no-files-found: ignore
+
+      - name: Upload Playwright test results
+        uses: actions/upload-artifact@v6.0.0
+        if: ${{ failure() }}
+        with:
+          name: test-results
+          path: test-results
+          if-no-files-found: ignore
diff --git a/.gitignore b/.gitignore
index 76add87..0b2c868 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 node_modules
-dist
\ No newline at end of file
+dist
+playwright-report
+test-results
\ No newline at end of file
diff --git a/README.md b/README.md
index b66108c..87d6e0e 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,34 @@ npm run dev
 
 Then open the URL printed by the dev server (it should open `src/index.html`).
 
+## End-to-end tests
+
+Install Playwright browsers once before your first local run:
+
+```bash
+npx playwright install
+```
+
+If your environment needs system dependencies too (for example Linux CI-like containers), use:
+
+```bash
+npx playwright install --with-deps
+```
+
+Run local Playwright tests (Chromium):
+
+```bash
+npm run test:e2e
+```
+
+Run locally with headed browser:
+
+```bash
+npm run test:e2e:headed
+```
+
+CI runs Playwright on Chromium and WebKit.
+
 ## Notes
 
 - This is currently a development playground, not a stable product.
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 0000000..7adedfa
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,28 @@
+import playwright from 'eslint-plugin-playwright'
+import tsParser from '@typescript-eslint/parser'
+
+const playwrightConfig = playwright.configs['flat/recommended']
+
+export default [
+  {
+    ignores: [
+      'dist/**',
+      'coverage/**',
+      'node_modules/**',
+      'playwright-report/**',
+      'test-results/**',
+    ],
+  },
+  {
+    files: ['playwright/**/*.{ts,tsx,js,jsx}', 'playwright.config.ts'],
+    languageOptions: {
+      parser: tsParser,
+      sourceType: 'module',
+      ecmaVersion: 'latest',
+    },
+  },
+  {
+    ...playwrightConfig,
+    files: ['playwright/**/*.{ts,tsx,js,jsx}'],
+  },
+]
diff --git a/package-lock.json b/package-lock.json
index 2ddb437..5e2ca99 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,12 +9,18 @@
       "version": "0.1.0",
       "license": "MIT",
       "devDependencies": {
+        "@playwright/test": "^1.58.2",
+        "@types/node": "^25.5.0",
+        "@typescript-eslint/parser": "^8.57.1",
+        "eslint": "^10.0.3",
+        "eslint-plugin-playwright": "^2.10.0",
         "http-server": "^14.1.1",
         "husky": "^9.1.7",
         "jspm": "^4.4.0",
         "lint-staged": "^16.4.0",
         "oxlint": "^1.55.0",
-        "prettier": "^3.8.1"
+        "prettier": "^3.8.1",
+        "typescript": "^5.9.3"
       },
       "engines": {
         "node": ">=22.22.1"
@@ -469,6 +475,165 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@eslint-community/eslint-utils": {
+      "version": "4.9.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.1.tgz",
+      "integrity": "sha512-phrYmNiYppR7znFEdqgfWHXR6NCkZEK7hwWDHZUjit/2/U0r6XvkDl0SYnoM51Hq7FhCGdLDT6zxCCOY1hexsQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "eslint-visitor-keys": "^3.4.3"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      },
+      "peerDependencies": {
+        "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
+      }
+    },
+    "node_modules/@eslint-community/eslint-utils/node_modules/eslint-visitor-keys": {
+      "version": "3.4.3",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-3.4.3.tgz",
+      "integrity": "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/@eslint-community/regexpp": {
+      "version": "4.12.2",
+      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.2.tgz",
+      "integrity": "sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
+      }
+    },
+    "node_modules/@eslint/config-array": {
+      "version": "0.23.3",
+      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.23.3.tgz",
+      "integrity": "sha512-j+eEWmB6YYLwcNOdlwQ6L2OsptI/LO6lNBuLIqe5R7RetD658HLoF+Mn7LzYmAWWNNzdC6cqP+L6r8ujeYXWLw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/object-schema": "^3.0.3",
+        "debug": "^4.3.1",
+        "minimatch": "^10.2.4"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=24"
+      }
+    },
+    "node_modules/@eslint/config-helpers": {
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.5.3.tgz",
+      "integrity": "sha512-lzGN0onllOZCGroKJmRwY6QcEHxbjBw1gwB8SgRSqK8YbbtEXMvKynsXc3553ckIEBxsbMBU7oOZXKIPGZNeZw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/core": "^1.1.1"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=24"
+      }
+    },
+    "node_modules/@eslint/core": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-1.1.1.tgz",
+      "integrity": "sha512-QUPblTtE51/7/Zhfv8BDwO0qkkzQL7P/aWWbqcf4xWLEYn1oKjdO0gglQBB4GAsu7u6wjijbCmzsUTy6mnk6oQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@types/json-schema": "^7.0.15"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=24"
+      }
+    },
+    "node_modules/@eslint/object-schema": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@eslint/object-schema/-/object-schema-3.0.3.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=24"
+      }
+    },
+    "node_modules/@eslint/plugin-kit": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/@eslint/plugin-kit/-/plugin-kit-0.6.1.tgz",
+      "integrity": "sha512-iH1B076HoAshH1mLpHMgwdGeTs0CYwL0SPMkGuSebZrwBp16v415e9NZXg2jtrqPVQjf6IANe2Vtlr5KswtcZQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/core": "^1.1.1",
+        "levn": "^0.4.1"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=24"
+      }
+    },
+    "node_modules/@humanfs/core": {
+      "version": "0.19.1",
+      "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.1.tgz",
+      "integrity": "sha512-5DyQ4+1JEUzejeK1JGICcideyfUbGixgS9jNgex5nqkW+cY7WZhxBigmieN5Qnw9ZosSNVC9KQKyb+GUaGyKUA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18.0"
+      }
+    },
+    "node_modules/@humanfs/node": {
+      "version": "0.16.7",
+      "resolved": "https://registry.npmjs.org/@humanfs/node/-/node-0.16.7.tgz",
+      "integrity": "sha512-/zUx+yOsIrG4Y43Eh2peDeKCxlRt/gET6aHfaKpuq267qXdYDFViVHfMaLyygZOnl0kGWxFIgsBy8QFuTLUXEQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@humanfs/core": "^0.19.1",
+        "@humanwhocodes/retry": "^0.4.0"
+      },
+      "engines": {
+        "node": ">=18.18.0"
+      }
+    },
+    "node_modules/@humanwhocodes/module-importer": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
+      "integrity": "sha512-bxveV4V8v5Yb4ncFTT3rPSgZBOpCkjfK0y4oVVVJwIuDVBRMDXrPyXRL988i5ap9m9bnyEEjWfm5WkBmtffLfA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=12.22"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
+    "node_modules/@humanwhocodes/retry": {
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.4.3.tgz",
+      "integrity": "sha512-bV0Tgo9K4hfPCek+aMAn81RppFKv2ySDQeMoSZuvTASywNTnVJCArCZE2FWqpvIatKu7VMRLWlR1EazvVhDyhQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
@@ -936,6 +1101,208 @@
         "node": "^20.19.0 || >=22.12.0"
       }
     },
+    "node_modules/@playwright/test": {
+      "version": "1.58.2",
+      "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.58.2.tgz",
+      "integrity": "sha512-akea+6bHYBBfA9uQqSYmlJXn61cTa+jbO87xVLCWbTqbWadRVmhxlXATaOjOgcBaWU4ePo0wB41KMFv3o35IXA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright": "1.58.2"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@types/esrecurse": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/@types/esrecurse/-/esrecurse-4.3.1.tgz",
+      "integrity": "sha512-xJBAbDifo5hpffDBuHl0Y8ywswbiAp/Wi7Y/GtAgSlZyIABppyurxVueOPE8LUQOxdlgi6Zqce7uoEpqNTeiUw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/estree": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.8.tgz",
+      "integrity": "sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/json-schema": {
+      "version": "7.0.15",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.15.tgz",
+      "integrity": "sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/node": {
+      "version": "25.5.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.5.0.tgz",
+      "integrity": "sha512-jp2P3tQMSxWugkCUKLRPVUpGaL5MVFwF8RDuSRztfwgN1wmqJeMSbKlnEtQqU8UrhTmzEmZdu2I6v2dpp7XIxw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~7.18.0"
+      }
+    },
+    "node_modules/@typescript-eslint/parser": {
+      "version": "8.57.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-8.57.1.tgz",
+      "integrity": "sha512-k4eNDan0EIMTT/dUKc/g+rsJ6wcHYhNPdY19VoX/EOtaAG8DLtKCykhrUnuHPYvinn5jhAPgD2Qw9hXBwrahsw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@typescript-eslint/scope-manager": "8.57.1",
+        "@typescript-eslint/types": "8.57.1",
+        "@typescript-eslint/typescript-estree": "8.57.1",
+        "@typescript-eslint/visitor-keys": "8.57.1",
+        "debug": "^4.4.3"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
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+        "eslint": "^8.57.0 || ^9.0.0 || ^10.0.0",
+        "typescript": ">=4.8.4 <6.0.0"
+      }
+    },
+    "node_modules/@typescript-eslint/project-service": {
+      "version": "8.57.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/project-service/-/project-service-8.57.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@typescript-eslint/tsconfig-utils": "^8.57.1",
+        "@typescript-eslint/types": "^8.57.1",
+        "debug": "^4.4.3"
+      },
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+        "url": "https://opencollective.com/typescript-eslint"
+      },
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+      }
+    },
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+      "license": "MIT",
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+        "@typescript-eslint/visitor-keys": "8.57.1"
+      },
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+        "url": "https://opencollective.com/typescript-eslint"
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+      "license": "MIT",
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+        "type": "opencollective",
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+      },
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+      "license": "MIT",
+      "engines": {
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+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
+    "node_modules/@typescript-eslint/typescript-estree": {
+      "version": "8.57.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-8.57.1.tgz",
+      "integrity": "sha512-ybe2hS9G6pXpqGtPli9Gx9quNV0TWLOmh58ADlmZe9DguLq0tiAKVjirSbtM1szG6+QH6rVXyU6GTLQbWnMY+g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@typescript-eslint/project-service": "8.57.1",
+        "@typescript-eslint/tsconfig-utils": "8.57.1",
+        "@typescript-eslint/types": "8.57.1",
+        "@typescript-eslint/visitor-keys": "8.57.1",
+        "debug": "^4.4.3",
+        "minimatch": "^10.2.2",
+        "semver": "^7.7.3",
+        "tinyglobby": "^0.2.15",
+        "ts-api-utils": "^2.4.0"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
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@@ -1900,6 +2648,19 @@
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@@ -1946,6 +2714,27 @@
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+      "license": "MIT"
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+      "license": "MIT"
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@@ -1976,6 +2765,30 @@
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+      "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.4.tgz",
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@@ -2035,6 +2848,22 @@
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+      "license": "MIT",
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@@ -2310,6 +3139,13 @@
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@@ -2412,6 +3248,24 @@
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+      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.4.tgz",
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@@ -2494,6 +3348,38 @@
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+      "license": "MIT",
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+      "funding": {
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@@ -2514,6 +3400,26 @@
       "dev": true,
       "license": "(MIT AND Zlib)"
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+    "node_modules/path-key": {
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+      "resolved": "https://registry.npmjs.org/path-key/-/path-key-3.1.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
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@@ -2561,6 +3467,38 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
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+    "node_modules/playwright": {
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+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.58.2.tgz",
+      "integrity": "sha512-vA30H8Nvkq/cPBnNw4Q8TWz1EJyqgpuinBcHET0YVJVFldr8JDNiU9LaWAE1KqSkRYazuaBhTpB5ZzShOezQ6A==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
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+      },
+      "bin": {
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+      },
+      "engines": {
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+      "optionalDependencies": {
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+    "node_modules/playwright-core": {
+      "version": "1.58.2",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.58.2.tgz",
+      "integrity": "sha512-yZkEtftgwS8CsfYo7nm0KE8jsvm6i/PTgVtB8DL726wNf6H2IMsDuxCpJj59KDaxCtSnrWan2AeDqM7JBaultg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
+      },
+      "engines": {
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       "resolved": "https://registry.npmjs.org/portfinder/-/portfinder-1.0.38.tgz",
@@ -2575,6 +3513,16 @@
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+      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
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       "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.8.1.tgz",
@@ -2591,6 +3539,16 @@
         "url": "https://github.com/prettier/prettier?sponsor=1"
       }
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+    "node_modules/punycode": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
+      "integrity": "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+      }
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       "resolved": "https://registry.npmjs.org/qs/-/qs-6.15.0.tgz",
@@ -2669,6 +3627,29 @@
         "semver": "bin/semver.js"
       }
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+    "node_modules/shebang-command": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "shebang-regex": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
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+    },
+    "node_modules/shebang-regex": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
+      "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+    },
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       "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.1.0.tgz",
@@ -2973,6 +3954,70 @@
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+    "node_modules/tinyglobby": {
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+      "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.15.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.3"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/SuperchupuDev"
+      }
+    },
+    "node_modules/ts-api-utils": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.4.0.tgz",
+      "integrity": "sha512-3TaVTaAv2gTiMB35i3FiGJaRfwb3Pyn/j3m/bfAvGe8FB7CF6u+LMYqYlDh7reQf7UNvoTvdfAqHGmPGOSsPmA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.12"
+      },
+      "peerDependencies": {
+        "typescript": ">=4.8.4"
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+    "node_modules/type-check": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "prelude-ls": "^1.2.1"
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+      "engines": {
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+    "node_modules/typescript": {
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
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+    },
+    "node_modules/undici-types": {
+      "version": "7.18.2",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.18.2.tgz",
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+      "dev": true,
+      "license": "MIT"
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@@ -3042,6 +4087,16 @@
         "browserslist": ">= 4.21.0"
       }
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+    "node_modules/uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "punycode": "^2.1.0"
+      }
+    },
     "node_modules/url-join": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/url-join/-/url-join-4.0.1.tgz",
@@ -3073,6 +4128,32 @@
         "node": ">=12"
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+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
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+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
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+    },
+    "node_modules/word-wrap": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
+      "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
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       "version": "9.0.2",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-9.0.2.tgz",
@@ -3119,6 +4200,19 @@
       "funding": {
         "url": "https://github.com/sponsors/eemeli"
       }
+    },
+    "node_modules/yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 4cca463..7ee4346 100644
--- a/package.json
+++ b/package.json
@@ -31,17 +31,27 @@
     "build:jspm": "KNIGHTED_PRIMARY_CDN=jspmGa npm run build",
     "build:importmap-mode": "KNIGHTED_PRIMARY_CDN=importMap npm run build",
     "preview": "http-server dist -a localhost -c-1 -o index.html",
+    "check-types": "tsc -p tsconfig.json",
+    "lint:playwright": "eslint playwright playwright.config.ts",
+    "test:e2e": "playwright test",
+    "test:e2e:headed": "playwright test --headed",
     "test": "echo \"Error: no test specified\" && exit 1",
     "prettier": "prettier --write .",
-    "lint": "oxlint src scripts"
+    "lint": "oxlint src scripts && npm run lint:playwright"
   },
   "devDependencies": {
+    "@playwright/test": "^1.58.2",
+    "@types/node": "^25.5.0",
+    "@typescript-eslint/parser": "^8.57.1",
+    "eslint": "^10.0.3",
+    "eslint-plugin-playwright": "^2.10.0",
     "http-server": "^14.1.1",
     "husky": "^9.1.7",
     "jspm": "^4.4.0",
     "lint-staged": "^16.4.0",
     "oxlint": "^1.55.0",
-    "prettier": "^3.8.1"
+    "prettier": "^3.8.1",
+    "typescript": "^5.9.3"
   },
   "lint-staged": {
     "**/*": [
diff --git a/playwright.config.ts b/playwright.config.ts
new file mode 100644
index 0000000..be47e6b
--- /dev/null
+++ b/playwright.config.ts
@@ -0,0 +1,45 @@
+import { defineConfig, devices } from '@playwright/test'
+
+const env = (globalThis as { process?: { env?: Record<string, string | undefined> } })
+  .process?.env
+
+const isCI = env?.CI === 'true'
+const HOST = env?.PLAYWRIGHT_HOST ?? '127.0.0.1'
+const PORT = Number(env?.PLAYWRIGHT_PORT ?? 4174)
+const baseURL = env?.PLAYWRIGHT_BASE_URL ?? `http://${HOST}:${PORT}`
+const projects = [
+  {
+    name: 'chromium',
+    use: { ...devices['Desktop Chrome'] },
+  },
+]
+
+if (isCI) {
+  projects.push({
+    name: 'webkit',
+    use: { ...devices['Desktop Safari'] },
+  })
+}
+
+export default defineConfig({
+  testDir: 'playwright',
+  timeout: isCI ? 120_000 : 20_000,
+  retries: isCI ? 1 : 0,
+  expect: {
+    timeout: isCI ? 90_000 : 15_000,
+  },
+  reporter: isCI ? 'github' : 'list',
+  use: {
+    baseURL,
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+    video: 'retain-on-failure',
+  },
+  webServer: {
+    command: `npx http-server . -a ${HOST} -p ${PORT} -c-1`,
+    url: `${baseURL}/src/index.html`,
+    reuseExistingServer: !isCI,
+    timeout: 120_000,
+  },
+  projects,
+})
diff --git a/playwright/app.spec.ts b/playwright/app.spec.ts
new file mode 100644
index 0000000..8a13532
--- /dev/null
+++ b/playwright/app.spec.ts
@@ -0,0 +1,167 @@
+import { expect, test } from '@playwright/test'
+import type { Page } from '@playwright/test'
+
+const waitForInitialRender = async (page: Page) => {
+  await page.goto('/src/index.html')
+  await expect(page.getByRole('heading', { name: '@knighted/develop' })).toBeVisible()
+  await expect(page.locator('#status')).toHaveText('Rendered')
+  await expect(page.locator('#cdn-loading')).toHaveAttribute('hidden', '')
+}
+
+test('renders default playground preview', async ({ page }) => {
+  await waitForInitialRender(page)
+
+  await page.getByLabel('ShadowRoot (open)').uncheck()
+  await expect(page.locator('#status')).toHaveText('Rendered')
+
+  const previewItems = page.locator('#preview-host li')
+  await expect(previewItems).toHaveCount(3)
+  await expect(previewItems.first()).toContainText('apple')
+})
+
+test('supports layout and theme toggles', async ({ page }) => {
+  await waitForInitialRender(page)
+
+  await page.getByLabel('Use side preview layout').click()
+  await expect(page.locator('.app-grid')).toHaveClass(/app-grid--preview-right/)
+
+  await page.getByLabel('Use light theme').click()
+  await expect(page.locator('html')).toHaveAttribute('data-theme', 'light')
+
+  const colorInput = page.locator('#preview-bg-color')
+  await colorInput.fill('#2456a8')
+  await expect(page.locator('#preview-host')).toHaveCSS(
+    'background-color',
+    'rgb(36, 86, 168)',
+  )
+})
+
+test('renders in react mode with css modules', async ({ page }) => {
+  await waitForInitialRender(page)
+
+  await page.getByLabel('ShadowRoot (open)').uncheck()
+  await page.locator('#render-mode').selectOption('react')
+  await page.locator('#style-mode').selectOption('module')
+  await expect(page.locator('#status')).toHaveText('Rendered')
+
+  const previewItems = page.locator('#preview-host li')
+  await expect(previewItems).toHaveCount(3)
+  await expect(previewItems.first()).toContainText('apple')
+})
+
+test('shows error status when component source is cleared', async ({ page }) => {
+  await waitForInitialRender(page)
+
+  const dialog = page.locator('#clear-confirm-dialog')
+  await page.getByLabel('Clear component source').click()
+  await expect(dialog).toHaveAttribute('open', '')
+  await dialog.getByRole('button', { name: 'Clear' }).click()
+
+  await expect(page.locator('#status')).toHaveText('Error')
+  await expect(page.locator('#preview-host pre')).toContainText(
+    'Expected a render() function or a component named App/View.',
+  )
+})
+
+test('requires render button when auto render is disabled', async ({ page }) => {
+  await waitForInitialRender(page)
+
+  const autoRenderToggle = page.getByLabel('Auto render')
+  const renderButton = page.getByRole('button', { name: 'Render' })
+  const styleMode = page.locator('#style-mode')
+  const styleWarning = page.locator('#style-warning')
+
+  await expect(styleWarning).toHaveText('')
+  await autoRenderToggle.uncheck()
+  await expect(renderButton).toBeVisible()
+
+  await styleMode.selectOption('module')
+  await expect(styleWarning).toHaveText('')
+
+  await renderButton.click()
+  await expect(page.locator('#status')).toHaveText('Rendered')
+  await expect(styleWarning).toContainText('CSS Modules are compiled in-browser')
+})
+
+test('persists layout and theme across reload', async ({ page }) => {
+  await waitForInitialRender(page)
+
+  await page.getByLabel('Use side preview layout').click()
+  await page.getByLabel('Use light theme').click()
+  await expect(page.locator('.app-grid')).toHaveClass(/app-grid--preview-right/)
+  await expect(page.locator('html')).toHaveAttribute('data-theme', 'light')
+
+  await page.reload()
+  await waitForInitialRender(page)
+
+  await expect(page.locator('.app-grid')).toHaveClass(/app-grid--preview-right/)
+  await expect(page.locator('html')).toHaveAttribute('data-theme', 'light')
+})
+
+test('renders with less style mode', async ({ page }) => {
+  await waitForInitialRender(page)
+
+  await page.getByLabel('ShadowRoot (open)').uncheck()
+  await page.locator('#style-mode').selectOption('less')
+  await expect(page.locator('#status')).toHaveText('Rendered')
+  await expect(page.locator('#style-warning')).toContainText(
+    'Less is compiled in-browser via @knighted/css/browser.',
+  )
+
+  const previewItems = page.locator('#preview-host li')
+  await expect(previewItems).toHaveCount(3)
+  await expect(previewItems.first()).toContainText('apple')
+})
+
+test('renders with sass style mode', async ({ page }) => {
+  await waitForInitialRender(page)
+
+  await page.getByLabel('ShadowRoot (open)').uncheck()
+  await page.locator('#style-mode').selectOption('sass')
+  await expect(page.locator('#status')).toHaveText('Rendered')
+  await expect(page.locator('#style-warning')).toContainText(
+    'Sass is compiled in-browser via @knighted/css/browser.',
+  )
+
+  const previewItems = page.locator('#preview-host li')
+  await expect(previewItems).toHaveCount(3)
+  await expect(previewItems.first()).toContainText('apple')
+})
+
+test('clear component action opens confirm dialog and can be canceled', async ({
+  page,
+}) => {
+  await waitForInitialRender(page)
+
+  const dialog = page.locator('#clear-confirm-dialog')
+  const jsxEditor = page.locator('#jsx-editor')
+
+  const beforeValue = await jsxEditor.inputValue()
+  await page.getByLabel('Clear component source').click()
+
+  await expect(dialog).toHaveAttribute('open', '')
+  await expect(page.locator('#clear-confirm-title')).toHaveText('Clear Component source?')
+
+  await dialog.getByRole('button', { name: 'Cancel' }).click()
+  await expect(dialog).not.toHaveAttribute('open', '')
+  await expect(jsxEditor).toHaveValue(beforeValue)
+})
+
+test('clear styles action opens confirm dialog and clears on confirm', async ({
+  page,
+}) => {
+  await waitForInitialRender(page)
+
+  const dialog = page.locator('#clear-confirm-dialog')
+  const cssEditor = page.locator('#css-editor')
+
+  await page.getByLabel('Clear styles source').click()
+
+  await expect(dialog).toHaveAttribute('open', '')
+  await expect(page.locator('#clear-confirm-title')).toHaveText('Clear Styles source?')
+
+  await dialog.getByRole('button', { name: 'Clear' }).click()
+  await expect(dialog).not.toHaveAttribute('open', '')
+  await expect(cssEditor).toHaveValue('')
+  await expect(page.locator('#status')).toHaveText('Styles cleared')
+})
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..02e4c52
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "lib": ["ESNext", "DOM"],
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "strict": true,
+    "noEmit": true,
+    "types": ["node", "@playwright/test"]
+  },
+  "include": ["playwright/**/*.ts", "playwright.config.ts"]
+}