fix regression; #1417

src/components/dropdown/dropdown.ts

@@ -411,13 +411,8 @@ export default class SlDropdown extends ShoelaceElement {
           @slotchange=${this.handleTriggerSlotChange}
         ></slot>
 
-        <div
-          part="panel"
-          class="dropdown__panel"
-          aria-hidden=${this.open ? 'false' : 'true'}
-          aria-labelledby="dropdown"
-        >
-          <slot></slot>
+        <div aria-hidden=${this.open ? 'false' : 'true'} aria-labelledby="dropdown">
+          <slot part="panel" class="dropdown__panel"></slot>
         </div>
       </sl-popup>
     `;

web-test-runner.config.js

@@ -5,7 +5,7 @@ import { playwrightLauncher } from '@web/test-runner-playwright';
 export default {
   rootDir: '.',
   files: 'src/**/*.test.ts', // "default" group
-  concurrentBrowsers: 1,
+  concurrentBrowsers: 3,
   nodeResolve: true,
   testFramework: {
     config: {