ling1726
diff --git a/‎.eslintrc.cjs
+27 b/‎.eslintrc.cjs
+27
diff --git a/‎.gitignore
+24 b/‎.gitignore
+24
diff --git a/‎README.md
+21 b/‎README.md
+21
diff --git a/‎index.html
+13 b/‎index.html
+13
@@ -0,0 +1,27 @@
+/* eslint-env node */
+
+module.exports = {
+  root: true,
+  env: { browser: true, es2020: true },
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:@typescript-eslint/recommended-requiring-type-checking',
+    'plugin:react-hooks/recommended',
+  ],
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 'latest',
+    sourceType: 'module',
+    project: true,
+    tsconfigRootDir: __dirname,
+  },
+  plugins: ['react-refresh'],
+  rules: {
+    'react-refresh/only-export-components': [
+      'warn',
+      { allowConstantExport: true },
+    ],
+    '@typescript-eslint/no-non-null-assertion': 'off',
+  },
+}
@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
@@ -0,0 +1,21 @@
+# CSS selector performance bench
+
+This app contains a demo usages of different types of CSS selectors to show the performance impact of them. Each example has:
+
+* Bad example - selector that can incur cost
+* Good example - applying style rules directly on elemnts using CSS classes
+
+## Start
+
+* npm install
+* npm run dev
+* visit http://localhost:5713
+
+
+## Usage
+
+The examples follow a consistent pattern to help with profiling. Each example has a single `toggle` button that performs some kind of CSS/DOM mutation that should be profiled to check the affected elements and selector matching in a performance profile.
+
+Each scenario has a README that describes the intention behind the example and what the impacts are.
+
+Each example is located under the `src/scenarios` folder.
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Vite + React + TS</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>