// Copyright 2014 The Flutter Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. import 'dart:html'; import 'package:flutter_test/flutter_test.dart'; /// Whether the current browser is Firefox. bool get isFirefox => window.navigator.userAgent.toLowerCase().contains('firefox'); /// Finds elements in the DOM tree rendered by the Flutter Web engine. /// /// If the browser supports shadow DOM, looks in the shadow root under the /// `<flt-glass-pane>` element. Otherwise, looks under `<flt-glass-pane>` /// without penetrating the shadow DOM. In the latter case, if the application /// creates platform views, this will also find platform view elements. List<Node> findElements(String selector) { final Element? glassPane = document.querySelector('flt-glass-pane'); if (glassPane == null) { fail( 'Failed to locate <flt-glass-pane>. Possible reasons:\n' ' - The application failed to start' ' - `findElements` was called before the application started' ); } final ShadowRoot? shadowRoot = glassPane.shadowRoot; return shadowRoot != null ? shadowRoot.querySelectorAll(selector) : glassPane.querySelectorAll(selector); }