display: run-in
- CRIf the run-in box contains a block box, same as block. If a block box follows the run-in box, the run-in box becomes the first inline box of the block box. If an inline box follows, the run-in box becomes a block box.
Chrome
- 4 - 31: Supported
- 32 - 116: Not supported
- 117: Not supported
- 118 - 120: Not supported
Edge
- 12 - 116: Not supported
- 117: Not supported
Safari
- 3.1 - 4: Supported
- 5 - 6: Supported
- 6.1: Support unknown
- 7 - 16.5: Not supported
- 16.6: Not supported
- 17.0 - TP: Not supported
Firefox
- 2 - 116: Not supported
- 117: Not supported
- 118 - 120: Not supported
Opera
- 9 - 18: Supported
- 19 - 101: Not supported
- 102: Not supported
IE
- 5.5 - 7: Not supported
- 8 - 10: Supported
- 11: Supported
Chrome for Android
- 117: Not supported
Safari on iOS
- 3.2: Supported
- 4 - 7.1: Supported
- 8 - 16.6: Not supported
- 17.0: Not supported
- 17.1: Not supported
Samsung Internet
- 4 - 21: Not supported
- 22: Not supported
Opera Mini
- all: Supported
Opera Mobile
- 10 - 12.1: Supported
- 73: Not supported
UC Browser for Android
- 15.5: Not supported
Android Browser
- 2.1 - 4.4: Supported
- 4.4.3: Not supported
- 117: Not supported
Firefox for Android
- 117: Not supported
QQ Browser
- 13.1: Not supported
Baidu Browser
- 13.18: Not supported
KaiOS Browser
- 2.5: Not supported
- 3: Not supported
- Resources:
- Mozilla bug report
- CSS Tricks article