235656 2022-01-26 10:49:07 -0800 Blocked link to font source does not emit error event 2022-11-16 09:28:20 -0800 1 1 1 Unclassified WebKit WebCore Misc. WebKit Nightly Build Unspecified Unspecified RESOLVED CONFIGURATION CHANGED InRadar P2 Normal --- 246663 1 pgriffis webkit-unassigned achristensen bfulgham mmaxfield rreno webkit-bug-importer oldest_to_newest 1834168 0 pgriffis 2022-01-26 10:49:07 -0800 There are a couple of WPT tests that rely on the onerror handler being called when a font source is blocked by CSP. They can be seen here: https://wpt.fyi/results/content-security-policy/font-src?label=master&label=experimental&product=safari&product=webkitgtk But a snippet is: var link = document.createElement('link'); link.rel="preload"; link.as="font"; link.href="http://{{hosts[alt][]}}:{{ports[http][0]}}/fonts/Ahem.ttf?font-none-blocked"; link.onload = t.unreached_func("Should not have loaded the font."); link.onerror = t.step_func_done(); document.getElementsByTagName('head')[0].appendChild(link); 1836528 1 webkit-bug-importer 2022-02-02 10:50:18 -0800 <rdar://problem/88389961> 1912899 2 rreno 2022-11-16 09:28:20 -0800 This was fixed by https://bugs.webkit.org/show_bug.cgi?id=246663