272753 2024-04-16 07:14:24 -0700 Above 120hz animations are not supported on Macs or iPads with external displays. 2024-04-23 13:28:36 -0700 1 1 1 Unclassified WebKit Animations Safari 17 Mac (Apple Silicon) macOS 14 RESOLVED INVALID https://www.testufo.com BrowserCompat, InRadar P2 Major --- 1 possum.bracing0v webkit-unassigned dino graouts karlcow possum.bracing0v simon.fraser webkit-bug-importer oldest_to_newest 2028804 0 possum.bracing0v 2024-04-16 07:14:24 -0700 Currently displays can go up to 500hz. Chrome and Firefox both support an unlimited refresh rate for animations. This is needed for games so that players can see higher fps and hz. You can test this with a monitor that has higher than 120hz on https://www.testufo.com Also Note: PWAs do not support above 60hz animations because the "prefer page rendering updates near 60fps" feature flag is on by default. This feature flag will have to be off to test for this bug regardless if you test in a PWA or normal Safari. 2030537 1 webkit-bug-importer 2024-04-23 07:15:23 -0700 <rdar://problem/126918647> 2030609 2 possum.bracing0v 2024-04-23 12:07:53 -0700 This most likely also happens with iPads with external displays above 120hz as well. It seems all of safari is capped at 120hz instead of the screen's native refresh rate. 2030616 3 simon.fraser 2024-04-23 12:17:41 -0700 We tested a 144Hz display with a Mac and the settings worked as expected. 2030630 4 possum.bracing0v 2024-04-23 12:43:22 -0700 Using www.testufo.com you saw 144fps on the display? Is the same true if you use an iPad with the same display, the test also shows 144fps?