Repository: flutter
Issue: Semantics onTap also triggering background content on mobile web
Labels: a: accessibility,platform-web,has reproducible steps,P2,browser: safari-ios,team-web,triaged-web,found in release: 3.27,found in release: 3.28

### Steps to reproduce


1. Wrap a button with semantics with the following values:
```
Semantics(
              label: "test",
              hint: "hint test",
              excludeSemantics: true,
              onTap: _incrementCounter,
              child: IconButton(
                onPressed: _incrementCounter,
                icon: const Icon(Icons.add),
              ),
            ),
```
2. Run on mobile web
2.a. Change the flutter settings so you can connect to the webserver on your phone
3. Click the button slowly a few times

### Expected results

The value should increment once for each press

### Actual results

Sometimes, the button increments twice


### Code sample

Repo available here: https://github.com/edeetee/bug_doubletap_semantics

<details open><summary>Code sample</summary>

```dart
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  RendererBinding.instance.ensureSemantics();

  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a purple toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      print('Incrementing counter');
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // TRY THIS: Try changing the color here to a specific color (to
        // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
        // change color while the other colors stay the same.
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          //
          // TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
          // action in the IDE, or press "p" in the console), to see the
          // wireframe for each widget.
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Semantics(
              label: "test",
              hint: "hint test",
              excludeSemantics: true,
              onTap: _incrementCounter,
              child: IconButton(
                onPressed: _incrementCounter,
                icon: const Icon(Icons.add),
              ),
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: Semantics(
        button: true,
        excludeSemantics: true,
        onTap: _incrementCounter,
        child: FloatingActionButton(
          onPressed: _incrementCounter,
          tooltip: 'Increment',
          child: const Icon(Icons.add),
        ),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

```

</details>


### Screenshots or Video

<details open>
<summary>Screenshots / Video demonstration</summary>


https://github.com/user-attachments/assets/e5500247-4bd9-4722-9a00-cb6c48e113b8



</details>


### Logs

<details open><summary>Logs</summary>

```console
Launching lib/main.dart on Chrome in debug mode...
This app is linked to the debug service: ws://127.0.0.1:60670/2n9b5kV5aos=/ws
Debug service listening on ws://127.0.0.1:60670/2n9b5kV5aos=/ws
Connecting to VM Service at ws://127.0.0.1:60670/2n9b5kV5aos=/ws
Connected to the VM Service.
4
Incrementing counter
Restarted application in 100ms.
7
Incrementing counter
Restarted application in 96ms.
Restarted application in 47ms.
```

</details>


### Flutter Doctor output

The error was initially happening on the version this test is written in, 3.24.3. I tested it in the most recent version, and it actually regressed, now it always happens.

<details open><summary>Doctor output</summary>

```console
[flutter] flutter doctor -v
[✓] Flutter (Channel stable, 3.24.3, on macOS 15.0 24A335 darwin-arm64, locale en-NZ)
    • Flutter version 3.24.3 on channel stable at /Users/edeetee/fvm/versions/3.24.3
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 2663184aa7 (3 months ago), 2024-09-11 16:27:48 -0500
    • Engine revision 36335019a8
    • Dart version 3.5.3
    • DevTools version 2.37.3

[!] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /Users/edeetee/Library/Android/sdk
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/to/macos-android-setup for more details.

[✓] Xcode - develop for iOS and macOS (Xcode 16.2)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 16C5032a
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 21.0.3+-79915917-b509.11)

[!] Android Studio (version unknown)
    • Android Studio at /Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    ✗ Unable to determine Android Studio version.
    ✗ android-studio-dir = /
    ✗ Android Studio not found at /Contents
    • Try updating or re-installing Android Studio.
    • Consider removing your android-studio-dir setting by running:
      flutter config --android-studio-dir=

[✓] VS Code (version 1.96.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.102.0

[✓] Connected device (4 available)
    • Edward’s iPhone (mobile)        • 00008030-000C4D3E1198C02E • ios            • iOS 18.1.1 22B91
    • macOS (desktop)                 • macos                     • darwin-arm64   • macOS 15.0 24A335 darwin-arm64
    • Mac Designed for iPad (desktop) • mac-designed-for-ipad     • darwin         • macOS 15.0 24A335 darwin-arm64
    • Chrome (web)                    • chrome                    • web-javascript • Google Chrome 131.0.6778.140

[✓] Network resources
    • All expected network resources are available.

! Doctor found issues in 2 categories.
exit code 0

```

</details>