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: Supported
  3. 80: Supported

Firefox

  1. 2 - 73: Supported
  2. 74: Supported
  3. 75 - 76: Supported

Chrome

  1. 4 - 79: Supported
  2. 80: Supported
  3. 81 - 83: Supported

Safari

  1. 3.1 - 12.1: Supported
  2. 13: Supported
  3. 13.1 - TP: Supported

Opera

  1. 9 - 12.1: Supported
  2. 15 - 65: Supported
  3. 66: Supported

iOS Safari

  1. 3.2 - 13.2: Not supported
  2. 13.3: Not supported
  3. 13.4: Not supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.3: Supported
  2. 4.4 - 4.4.4: Supported
  3. 80: Supported

Blackberry Browser

  1. 7: Supported
  2. 10: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 46: Not supported

Chrome for Android

  1. 80: Supported

Firefox for Android

  1. 68: Supported

IE Mobile

  1. 10: Not supported
  2. 11: Not supported

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4: Supported
  2. 5 - 10.1: Supported
  3. 11.1: Supported

QQ Browser

  1. 1.2: 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