Can I use
?

Autofocus attribute

- LS

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

Chrome

  1. ❌ 4: Not supported
  2. ✅ 5 - 154: Supported
  3. ✅ 155: Supported
  4. ✅ 156 - 158: Supported

Edge

  1. ✅ 12 - 154: Supported
  2. ✅ 155: Supported

Safari

  1. ❌ 3.1 - 4: Not supported
  2. ✅ 5 - 26.6: Supported
  3. ✅ 27: Supported
  4. ✅ 27.1 - TP: Supported

Firefox

  1. ❌ 2 - 3.6: Not supported
  2. ✅ 4 - 157: Supported
  3. ✅ 158: Supported
  4. ✅ 159 - 161: Supported

Opera

  1. ❌ 9: Not supported
  2. ✅ 9.5 - 134: Supported
  3. ✅ 135: Supported

IE

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

Chrome for Android

  1. ✅ 155: Supported

Safari on iOS

  1. ❌ 3.2 - 26.6: Not supported
  2. ❌ 27.0: Not supported
  3. ❌ 27.1 - 27.2: Not supported

Samsung Internet

  1. ✅ 4 - 29: Supported
  2. ✅ 30: 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. ✅ 155: Supported

Firefox for Android

  1. ✅ 158: 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