Run tests in browser (#18521)

tests/config/install-browser.js

@@ -0,0 +1,16 @@
+import { createRequire } from "node:module";
+
+function installBrowserSync() {
+  const { default: makeSynchronized } = createRequire(import.meta.url)(
+    "make-synchronized",
+  );
+  const { installBrowser } = makeSynchronized(
+    new URL("./browser/browser.js", import.meta.url),
+  );
+
+  const browser = process.env.TEST_RUNTIME_BROWSER || "chrome";
+
+  installBrowser({ browser });
+}
+
+export default installBrowserSync;