const {playwrightLauncher} = require('@web/test-runner-playwright');

const defaultBrowsers = [
  playwrightLauncher({product: 'chromium'}),
  playwrightLauncher({product: 'webkit'}),
  playwrightLauncher({product: 'firefox', concurrency: 1}),
];

const envBrowsers = process.env.BROWSERS?.split(',').map((product) =>
  playwrightLauncher({product})
);

const browsers = envBrowsers ?? defaultBrowsers;

module.exports = {
  files: `packages/scoped-custom-element-registry/test/**/*.test.(js|html)`,
  nodeResolve: true,
  concurrency: 10,
  browsers,
};

@@ -425,17 +425,23 @@
  files: 
-%60
+%5B%0A    '
 packages
@@ -500,9 +500,76 @@
 tml)
-%60
+',%0A    'packages/tests/custom-elements/wtr/**/*.test.(js%7Chtml)',%0A  %5D
 ,%0A  

Add a `wtr` folder to the custom elements polyfill tests folder.