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CSS widows & orphans

- REC

CSS properties to control when lines break across pages or columns by defining the amount of lines that must be left before or after the break.

Chrome

  1. 4 - 24: Not supported
  2. 25 - 123: Supported
  3. 124: Supported
  4. 125 - 127: Supported

Edge

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

Safari

  1. 3.1 - 6.1: Not supported
  2. 7 - 17.3: Supported
  3. 17.4: Supported
  4. 17.5 - TP: Supported

Firefox

  1. 2 - 124: Not supported
  2. 125: Not supported
  3. 126 - 128: Not supported

Opera

  1. 9 - 11.6: Supported
  2. 12 - 108: Supported
  3. 109: Supported

IE

  1. 5.5 - 7: Not supported
  2. 8 - 9: Supported
  3. 10: Supported
  4. 11: Supported

Chrome for Android

  1. 123: Supported

Safari on iOS

  1. 3.2 - 6.1: Not supported
  2. 7 - 17.3: Supported
  3. 17.4: Supported
  4. 17.5: Supported

Samsung Internet

  1. 4 - 23: Supported
  2. 24: Supported

Opera Mini

  1. all: Supported

Opera Mobile

  1. 10 - 12: Not supported
  2. 12.1: Supported
  3. 80: Supported

UC Browser for Android

  1. 15.5: Supported

Android Browser

  1. 2.1 - 4.3: Not supported
  2. 4.4 - 4.4.4: Supported
  3. 123: Supported

Firefox for Android

  1. 124: Not supported

QQ Browser

  1. 14.9: Supported

Baidu Browser

  1. 13.52: Supported

KaiOS Browser

  1. 2.5: Not supported
  2. 3: Not supported

Some older WebKit-based browsers recognize the properties, but do not appear to have actual support

Resources:
Firefox support bug
CSS last-line: Controlling Widows & Orphans
codrops article on orphans
codrops article on widows