Browser compatibility optimization

[HelloQingGuo]

Graded Browser Support

• A Grade

  • [ ] Chrome for Windows/Mac
  • [ ] Firefox for Windows/Mac
  • [ ] Safari for Mac
  • [ ] Edge for Windows
  • [ ] IE 11 for Windows
  • [ ] iOS Safari for iPhone/iPad
  • [ ] Android stock browser (last two versions) on phone/tablet
  • [ ] Chrome for Android (last two versions) on phone/tablet
  • [ ] Firefox for Android (last two versions) on phone/tablet

• B Grade

  • [ ] IE 10 for Windows

• C Grade

  • [ ] N/A