# Critical CSS Verification Guide To verify that your Critical CSS setup is functioning correctly, follow these steps using your browser's Developer Tools and by inspecting the page source. ## 1. Verify File Generation First, ensure the critical CSS file was actually created during your build process. * Run `npm run build` in your terminal. * Check your theme root folder (`wp-content/themes/wp-scratch/`). * Confirm that a file named **`critical.css`** exists and contains minified CSS. ## 2. Verify Inlining in `` This confirms that the PHP function `wp_scratch_inline_critical_css` is finding the file and printing it. 1. Open your local site in a browser. 2. Right-click and select **View Page Source** (or `Ctrl+U` / `Cmd+U`). 3. Search (`Ctrl+F` / `Cmd+F`) for `id="wp-scratch-critical-css"`. 4. You should see a `