Can I use
?

Autofocus attribute

- LS

Allows a form field to be immediately focused on page load.

Chrome

  1. ❌ 4: Not supported
  2. ✅ 5 - 142: Supported
  3. ✅ 143: Supported
  4. ✅ 144 - 146: Supported

Edge

  1. ✅ 12 - 142: Supported
  2. ✅ 143: Supported

Safari

  1. ❌ 3.1 - 4: Not supported
  2. ✅ 5 - 26.1: Supported
  3. ✅ 26.2: Supported
  4. ✅ TP: Supported

Firefox

  1. ❌ 2 - 3.6: Not supported
  2. ✅ 4 - 144: Supported
  3. ✅ 145: Supported
  4. ✅ 146 - 148: Supported

Opera

  1. ❌ 9: Not supported
  2. ✅ 9.5 - 121: Supported
  3. ✅ 122: Supported

IE

  1. ❌ 5.5 - 9: Not supported
  2. ✅ 10: Supported
  3. ✅ 11: Supported

Chrome for Android

  1. ✅ 142: Supported

Safari on iOS

  1. ❌ 3.2 - 18.7: Not supported
  2. ❌ 26.0: Not supported
  3. ❌ 26.1: Not supported

Samsung Internet

  1. ✅ 4 - 28: Supported
  2. ✅ 29: Supported

Opera Mini

  1. ❌ all: Not supported

Opera Mobile

  1. ❌ 10 - 12.1: Not supported
  2. ✅ 80: Supported

UC Browser for Android

  1. ✅ 15.5: Supported

Android Browser

  1. ❌ 2.1 - 2.3: Not supported
  2. ✅ 3 - 4.4.4: Supported
  3. ✅ 142: Supported

Firefox for Android

  1. ✅ 144: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: Supported

KaiOS Browser

  1. ❌ 2.5: Not supported
  2. ✅ 3: Supported

While not supported in iOS Safari, it does work in iOS WebViews.

Resources:
Article on autofocus
MDN Web Docs - autofocus attribute