Autofocus attribute

- LS

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

Chrome

  1. 4: Not supported
  2. 5 - 122: Supported
  3. 123: Supported
  4. 124 - 126: Supported

Edge

  1. 12 - 122: Supported
  2. 123: Supported

Safari

  1. 3.1 - 4: Not supported
  2. 5 - 17.3: Supported
  3. 17.4: Supported
  4. TP: Supported

Firefox

  1. 2 - 3.6: Not supported
  2. 4 - 123: Supported
  3. 124: Supported
  4. 125 - 127: Supported

Opera

  1. 9: Not supported
  2. 9.5 - 107: Supported
  3. 108: Supported

IE

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

Chrome for Android

  1. 122: Supported

Safari on iOS

  1. 3.2 - 17.3: Not supported
  2. 17.4: Not supported

Samsung Internet

  1. 4 - 22: Supported
  2. 23: 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. 122: Supported

Firefox for Android

  1. 123: 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