Can I use
?

tabindex global attribute

- LS

Specifies the focusability of the element and in what order (if any) it should become focused (relative to other elements) when "tabbing" through the document.

Chrome

  1. ﹖ 4 - 14: Support unknown
  2. ✅ 15 - 156: Supported
  3. ✅ 157: Supported
  4. ✅ 158 - 160: Supported

Edge

  1. ✅ 12 - 155: Supported
  2. ✅ 156: Supported

Safari

  1. ﹖ 3.1 - 5: Support unknown
  2. ✅ 5.1 - 27.1: Supported
  3. ✅ 27.2: Supported
  4. ✅ 27.3 - TP: Supported

Firefox

  1. ﹖ 2 - 3.6: Support unknown
  2. ✅ 4 - 158: Supported
  3. ✅ 159: Supported
  4. ✅ 160 - 162: Supported

Opera

  1. ﹖ 9: Support unknown
  2. ✅ 9.5 - 138: Supported
  3. ✅ 139: Supported

IE

  1. ﹖ 5.5 - 6: Support unknown
  2. ✅ 7 - 10: Supported
  3. ✅ 11: Supported

Chrome for Android

  1. ✅ 157: Supported

Safari on iOS

  1. ✅ 3.2 - 26.6: Supported
  2. ✅ 27.0: Supported
  3. ✅ 27.1 - 27.2: Supported

Samsung Internet

  1. ﹖ 4 - 30: Support unknown
  2. ﹖ 31: Support unknown

Opera Mini

  1. ﹖ all: Support unknown

Opera Mobile

  1. ﹖ 10 - 12.1: Support unknown
  2. ✅ 80: Supported

UC Browser for Android

  1. ✅ 15.5: Supported

Android Browser

  1. ﹖ 2.1 - 4.4.4: Support unknown
  2. ﹖ 157: Support unknown

Firefox for Android

  1. ✅ 159: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: Supported

KaiOS Browser

  1. ✅ 2.5: Supported
  2. ✅ 3: Supported

Mac OS X "Full Keyboard Access" refers to setting Keyboard→Shortcuts→Full Keyboard Access to "All controls" in the System Preferences.

"Unknown" support for mobile browsers is due to lacking a method of tabbing through fields.

Resources:
MDN Web Docs - tabindex attribute