Repository: flutter
Issue: [web_html]  Dimissible widget not rendering properly, had weird artifact when dragging, keyboard doesn't pop when focus on textfield
Labels: platform-android,platform-ios,framework,engine,f: material design,platform-web,c: rendering,e: web_html,has reproducible steps,P2,found in release: 2.0,found in release: 2.1,team-design,triaged-design

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## Steps to Reproduce

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1. Run `flutter create bug`.
2. Update the files as follows: ... <!-- include every file that is different from the template app! -->
3. My prototype web app, which was deployed to the web after uploading the build/web folder to AWS Amplify, does not appear to work when using mobile device browsers (Chrome on Android or iOS).  The app will crash at a certain point and will not display text in other parts where it is supposed to.  The web app works fine when using a desktop on Chrome.  It also works as a stand alone mobile app on iOS and Android.  Here is the link for the prototype web app:
https://mkcapp.app2playdev.com

**Expected results:**
The web app should work consistently and should not depend on what the device/browser is.

**Actual results:**
The app was crashing at certain points in the app and was not displaying text correctly in other areas.
Example, in the recipe converter, text was not displayed for mobile devices.  In the recipe converter, the app was crashing after attempting to convert the recipe.  This worked fine on desktop web and in development for Android/iOS mobile devices.  This does not work for mobile accessing the web app.

<details>
  <summary>Logs</summary>

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N/A

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N/A

<!-- Finally, paste the output of running `flutter doctor -v` here. -->

```
[√] Flutter (Channel stable, 2.0.3, on Microsoft Windows [Version 10.0.19042.867], locale en-US)
    • Flutter version 2.0.3 at C:\src\flutter
    • Framework revision 4d7946a68d (7 days ago), 2021-03-18 17:24:33 -0700
    • Engine revision 3459eb2436
    • Dart version 2.12.2

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at C:\Users\MKC\AppData\Local\Android\sdk
    • Platform android-30, build-tools 30.0.3
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 4.1.0)
    • Android Studio at C:\Program Files\Android\Android Studio
    • 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 1.8.0_242-release-1644-b01)

[√] VS Code (version 1.54.3)
    • VS Code at C:\Users\MKC\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.20.0

[√] Connected device (2 available)
    • Chrome (web) • chrome • web-javascript • Google Chrome 89.0.4389.90
    • Edge (web)   • edge   • web-javascript • Microsoft Edge 89.0.774.57

• No issues found!
```

</details>