See https://searchfox.org/wubkat/rev/4419a857fd628dde9bc8e2cbc8625be40f46ca70/LayoutTests/TestExpectations#3464 It seems except fullscreen-api-enabled-media-with-presentation-mode.html these tests are not enabled again in other platforms: https://searchfox.org/wubkat/search?q=media%2Felement-containing-pip-video-going-into-fullscreen.html&path=&case=false&regexp=false https://searchfox.org/wubkat/search?q=media%2Ffullscreen-api-enabled-media-with-presentation-mode.html&path=&case=false&regexp=false https://searchfox.org/wubkat/search?q=media%2Fnavigate-with-pip-should-not-crash.html&path=&case=false&regexp=false https://searchfox.org/wubkat/search?q=media%2Fpip-video-going-into-fullscreen.html&path=&case=false&regexp=false The "Wontfix" annotation was introduce by Alexey in https://commits.webkit.org/176993@main but at that times the tests were enabled again in "Sierra+", which is not true anymore.