PNG favicons

- LS

Icon used by browsers to identify a webpage or site. While all browsers support the .ico format, the PNG format can be preferable.

IE

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

Edge

  1. 12 - 18: Supported
  2. 79 - 86: Supported
  3. 87: Supported

Firefox

  1. 2 - 83: Supported
  2. 84: Supported
  3. 85 - 86: Supported

Chrome

  1. 4 - 86: Supported
  2. 87: Supported
  3. 88 - 90: Supported

Safari

  1. 3.1 - 13.1: Supported
  2. 14: Supported
  3. TP: Supported

Opera

  1. 9 - 12.1: Supported
  2. 15 - 71: Supported
  3. 72: Supported

iOS Safari

  1. 3.2 - 13.7: Not supported
  2. 14: Not supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.3: Supported
  2. 4.4 - 4.4.4: Supported
  3. 81: Supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 59: Not supported

Chrome for Android

  1. 87: Supported

Firefox for Android

  1. 83: Supported

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4: Supported
  2. 5 - 12.0: Supported
  3. 13.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Supported

Win8/IE10+ and iOS Safari support other types of icons for webpages too, using alternate tags.

See also SVG favicons.

Resources:
Detailed info on favicons for various uses