Can I use
?

input placeholder attribute

- LS

Method of setting placeholder text for text-like input fields, to suggest the expected inserted information.

Chrome

  1. 4 - 116: Supported
  2. 117: Supported
  3. 118 - 120: Supported

Edge

  1. 12 - 116: Supported
  2. 117: Supported

Safari

  1. 3.1 - 4: Partial support
  2. 5 - 16.6: Supported
  3. 17.0: Supported
  4. 17.1 - TP: Supported

Firefox

  1. 2 - 3.6: Not supported
  2. 4 - 116: Supported
  3. 117: Supported
  4. 118 - 120: Supported

Opera

  1. 9 - 10.6: Not supported
  2. 11 - 11.1: Partial support
  3. 11.5 - 101: Supported
  4. 102: Supported

IE

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

Chrome for Android

  1. 117: Supported

Safari on iOS

  1. 3.2 - 16.6: Supported
  2. 17.0: Supported
  3. 17.1: Supported

Samsung Internet

  1. 4 - 21: Supported
  2. 22: Supported

Opera Mini

  1. all: Supported

Opera Mobile

  1. 10: Not supported
  2. 11 - 12.1: Supported
  3. 73: Supported

UC Browser for Android

  1. 15.5: Supported

Android Browser

  1. 2.1 - 3: Supported
  2. 4 - 4.1: Partial support
  3. 4.2 - 4.4.4: Supported
  4. 117: Supported

Firefox for Android

  1. 117: Supported

QQ Browser

  1. 13.1: Supported

Baidu Browser

  1. 13.18: Supported

KaiOS Browser

  1. 2.5: Supported
  2. 3: Supported
Resources:
Issue 24626: Placeholder text for an input type=
Polyfill
has.js test
WebPlatform Docs
Article on usage