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212
packages/flutter_web/test/widgets/opacity_test.dart
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212
packages/flutter_web/test/widgets/opacity_test.dart
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// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter_web/io.dart';
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import 'package:flutter_web_ui/ui.dart';
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import 'package:flutter_web/widgets.dart';
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import 'package:flutter_web_test/flutter_web_test.dart';
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import 'package:flutter_web/material.dart';
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import '../rendering/mock_canvas.dart';
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import 'semantics_tester.dart';
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void main() {
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testWidgets('Opacity', (WidgetTester tester) async {
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final SemanticsTester semantics = SemanticsTester(tester);
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// Opacity 1.0: Semantics and painting
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await tester.pumpWidget(
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const Opacity(
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child: Text('a', textDirection: TextDirection.rtl),
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opacity: 1.0,
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),
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);
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expect(
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semantics,
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hasSemantics(
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TestSemantics.root(
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children: <TestSemantics>[
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TestSemantics.rootChild(
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id: 1,
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rect: const Rect.fromLTRB(0.0, 0.0, 800.0, 600.0),
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label: 'a',
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textDirection: TextDirection.rtl,
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),
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],
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),
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));
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expect(find.byType(Opacity), paints..paragraph());
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// Opacity 0.0: Nothing
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await tester.pumpWidget(
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const Opacity(
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child: Text('a', textDirection: TextDirection.rtl),
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opacity: 0.0,
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),
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);
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expect(
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semantics,
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hasSemantics(
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TestSemantics.root(),
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));
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expect(find.byType(Opacity), paintsNothing);
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// Opacity 0.0 with semantics: Just semantics
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await tester.pumpWidget(
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const Opacity(
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child: Text('a', textDirection: TextDirection.rtl),
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opacity: 0.0,
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alwaysIncludeSemantics: true,
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),
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);
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expect(
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semantics,
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hasSemantics(
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TestSemantics.root(
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children: <TestSemantics>[
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TestSemantics.rootChild(
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id: 1,
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rect: const Rect.fromLTRB(0.0, 0.0, 800.0, 600.0),
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label: 'a',
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textDirection: TextDirection.rtl,
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),
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],
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),
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));
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expect(find.byType(Opacity), paintsNothing);
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// Opacity 0.0 without semantics: Nothing
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await tester.pumpWidget(
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const Opacity(
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child: Text('a', textDirection: TextDirection.rtl),
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opacity: 0.0,
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alwaysIncludeSemantics: false,
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),
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);
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expect(
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semantics,
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hasSemantics(
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TestSemantics.root(),
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));
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expect(find.byType(Opacity), paintsNothing);
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// Opacity 0.1: Semantics and painting
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await tester.pumpWidget(
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const Opacity(
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child: Text('a', textDirection: TextDirection.rtl),
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opacity: 0.1,
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),
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);
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expect(
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semantics,
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hasSemantics(
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TestSemantics.root(
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children: <TestSemantics>[
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TestSemantics.rootChild(
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id: 1,
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rect: const Rect.fromLTRB(0.0, 0.0, 800.0, 600.0),
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label: 'a',
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textDirection: TextDirection.rtl,
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),
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],
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),
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));
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expect(find.byType(Opacity), paints..paragraph());
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// Opacity 0.1 without semantics: Still has semantics and painting
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await tester.pumpWidget(
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const Opacity(
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child: Text('a', textDirection: TextDirection.rtl),
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opacity: 0.1,
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alwaysIncludeSemantics: false,
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),
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);
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expect(
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semantics,
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hasSemantics(
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TestSemantics.root(
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children: <TestSemantics>[
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TestSemantics.rootChild(
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id: 1,
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rect: const Rect.fromLTRB(0.0, 0.0, 800.0, 600.0),
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label: 'a',
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textDirection: TextDirection.rtl,
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),
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],
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),
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));
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expect(find.byType(Opacity), paints..paragraph());
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// Opacity 0.1 with semantics: Semantics and painting
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await tester.pumpWidget(
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const Opacity(
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child: Text('a', textDirection: TextDirection.rtl),
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opacity: 0.1,
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alwaysIncludeSemantics: true,
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),
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);
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expect(
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semantics,
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hasSemantics(
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TestSemantics.root(
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children: <TestSemantics>[
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TestSemantics.rootChild(
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id: 1,
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rect: const Rect.fromLTRB(0.0, 0.0, 800.0, 600.0),
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label: 'a',
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textDirection: TextDirection.rtl,
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),
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],
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),
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));
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expect(find.byType(Opacity), paints..paragraph());
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semantics.dispose();
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});
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testWidgets('offset is correctly handled in Opacity',
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(WidgetTester tester) async {
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await tester.pumpWidget(MaterialApp(
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home: Scaffold(
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body: SingleChildScrollView(
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child: RepaintBoundary(
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: List<Widget>.generate(10, (int index) {
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return Opacity(
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opacity: 0.5,
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child: Padding(
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padding: const EdgeInsets.all(5.0),
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child: Container(
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color: Colors.blue,
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height: 50,
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),
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),
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);
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}),
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),
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),
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),
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),
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));
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await expectLater(
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find.byType(RepaintBoundary).first,
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matchesGoldenFile('opacity_test.offset.1.png'),
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skip: !Platform.isLinux,
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);
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}, skip: true);
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testWidgets('empty opacity does not crash', (WidgetTester tester) async {
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await tester.pumpWidget(
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RepaintBoundary(child: Opacity(opacity: 0.5, child: Container())),
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);
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final Element element =
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find.byType(RepaintBoundary).first.evaluate().single;
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// The following line will send the layer to engine and cause crash if an
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// empty opacity layer is sent.
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await element.renderObject.layer
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.toImage(const Rect.fromLTRB(0.0, 0.0, 1.0, 1.0));
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}, skip: true);
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}
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