To reproduce: 1. Open http://annevankesteren.nl/img/daddy 2. In another tab, open data:text/html,<img src=http://annevankesteren.nl/img/daddy> Notice that the text used in the image is not the same in both tabs. The former tab gets the correct font (loaded via @font-face), while the latter does not.
<rdar://problem/8874554>
I am not able to reproduce this bug in Safari 16 on macOS 12.5.1 and both are showing same text and only 3 px border / margin might be present with "data:text/html,<img%20src=http://annevankesteren.nl/img/daddy>" due to quirk mode, I believe but else it is working and matching other browsers (Chrome Canary 107 and Firefox Nightly 106). I am going to mark this as "RESOLVED CONFIGURATION CHANGED". Please reopen if it is reproduce with another test case or example. Thanks!