The following test fails on all platforms with WebKit 623.1:

WebIObserverTest > testIO() FAILED
    org.opentest4j.AssertionFailedError: Intersection ratio ==> expected: <0.5> but was: <0.4933333396911621>
        at app//org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
        at app//org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
        at app//org.junit.jupiter.api.AssertEquals.failNotEqual(AssertEquals.java:197)
        at app//org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:182)
        at app//org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:1156)
        at app//test.javafx.scene.web.WebIObserverTest.lambda$testIO$4(WebIObserverTest.java:114)