wpt / css / css-backgrounds / animations / border-radius-interpolation.html

Status: FAIL | Duration: 694ms | Subtests: 147/196 | Open test on wpt.live | wpt.fyi

TestTest SourceSubtests (147/196)

Data from commit:
a50cb89 wpt: run reference-named files which are themselves tests (#836) (2026-09-03)

SubtestStatusMessage
CSS Transitions: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (-0.3) should be [17px 37px 57px 77px / 117px 137px 157px 177px]PASS
CSS Transitions: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (0) should be [20px 40px 60px 80px / 120px 140px 160px 180px]PASS
CSS Transitions: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (0.3) should be [23px 43px 63px 83px / 123px 143px 163px 183px]PASS
CSS Transitions: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (0.6) should be [26px 46px 66px 86px / 126px 146px 166px 186px]PASS
CSS Transitions: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (1) should be [30px 50px 70px 90px / 130px 150px 170px 190px]PASS
CSS Transitions: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (1.5) should be [35px 55px 75px 95px / 135px 155px 175px 195px]PASS
CSS Transitions with transition: all: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (-0.3) should be [17px 37px 57px 77px / 117px 137px 157px 177px]PASS
CSS Transitions with transition: all: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (0) should be [20px 40px 60px 80px / 120px 140px 160px 180px]PASS
CSS Transitions with transition: all: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (0.3) should be [23px 43px 63px 83px / 123px 143px 163px 183px]PASS
CSS Transitions with transition: all: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (0.6) should be [26px 46px 66px 86px / 126px 146px 166px 186px]PASS
CSS Transitions with transition: all: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (1) should be [30px 50px 70px 90px / 130px 150px 170px 190px]PASS
CSS Transitions with transition: all: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (1.5) should be [35px 55px 75px 95px / 135px 155px 175px 195px]PASS
CSS Animations: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (-0.3) should be [17px 37px 57px 77px / 117px 137px 157px 177px]PASS
CSS Animations: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (0) should be [20px 40px 60px 80px / 120px 140px 160px 180px]PASS
CSS Animations: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (0.3) should be [23px 43px 63px 83px / 123px 143px 163px 183px]PASS
CSS Animations: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (0.6) should be [26px 46px 66px 86px / 126px 146px 166px 186px]PASS
CSS Animations: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (1) should be [30px 50px 70px 90px / 130px 150px 170px 190px]PASS
CSS Animations: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (1.5) should be [35px 55px 75px 95px / 135px 155px 175px 195px]PASS
Web Animations: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (-0.3) should be [17px 37px 57px 77px / 117px 137px 157px 177px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (0) should be [20px 40px 60px 80px / 120px 140px 160px 180px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (0.3) should be [23px 43px 63px 83px / 123px 143px 163px 183px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (0.6) should be [26px 46px 66px 86px / 126px 146px 166px 186px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (1) should be [30px 50px 70px 90px / 130px 150px 170px 190px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-radius> from [20px 40px 60px 80px / 120px 140px 160px 180px] to [30px 50px 70px 90px / 130px 150px 170px 190px] at (1.5) should be [35px 55px 75px 95px / 135px 155px 175px 195px]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <border-top-left-radius> from neutral to [20px] at (-0.3) should be [7px]PASS
CSS Transitions: property <border-top-left-radius> from neutral to [20px] at (0) should be [10px]PASS
CSS Transitions: property <border-top-left-radius> from neutral to [20px] at (0.3) should be [13px]PASS
CSS Transitions: property <border-top-left-radius> from neutral to [20px] at (0.6) should be [16px]PASS
CSS Transitions: property <border-top-left-radius> from neutral to [20px] at (1) should be [20px]PASS
CSS Transitions: property <border-top-left-radius> from neutral to [20px] at (1.5) should be [25px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from neutral to [20px] at (-0.3) should be [7px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from neutral to [20px] at (0) should be [10px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from neutral to [20px] at (0.3) should be [13px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from neutral to [20px] at (0.6) should be [16px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from neutral to [20px] at (1) should be [20px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from neutral to [20px] at (1.5) should be [25px]PASS
CSS Animations: property <border-top-left-radius> from neutral to [20px] at (-0.3) should be [7px]PASS
CSS Animations: property <border-top-left-radius> from neutral to [20px] at (0) should be [10px]PASS
CSS Animations: property <border-top-left-radius> from neutral to [20px] at (0.3) should be [13px]PASS
CSS Animations: property <border-top-left-radius> from neutral to [20px] at (0.6) should be [16px]PASS
CSS Animations: property <border-top-left-radius> from neutral to [20px] at (1) should be [20px]PASS
CSS Animations: property <border-top-left-radius> from neutral to [20px] at (1.5) should be [25px]PASS
Web Animations: property <border-top-left-radius> from neutral to [20px] at (-0.3) should be [7px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from neutral to [20px] at (0) should be [10px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from neutral to [20px] at (0.3) should be [13px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from neutral to [20px] at (0.6) should be [16px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from neutral to [20px] at (1) should be [20px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from neutral to [20px] at (1.5) should be [25px]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <border-top-left-radius> from [initial] to [20px] at (-0.3) should be [0px]PASS
CSS Transitions: property <border-top-left-radius> from [initial] to [20px] at (0) should be [0px]PASS
CSS Transitions: property <border-top-left-radius> from [initial] to [20px] at (0.3) should be [6px]PASS
CSS Transitions: property <border-top-left-radius> from [initial] to [20px] at (0.6) should be [12px]PASS
CSS Transitions: property <border-top-left-radius> from [initial] to [20px] at (1) should be [20px]PASS
CSS Transitions: property <border-top-left-radius> from [initial] to [20px] at (1.5) should be [30px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [initial] to [20px] at (-0.3) should be [0px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [initial] to [20px] at (0) should be [0px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [initial] to [20px] at (0.3) should be [6px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [initial] to [20px] at (0.6) should be [12px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [initial] to [20px] at (1) should be [20px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [initial] to [20px] at (1.5) should be [30px]PASS
CSS Animations: property <border-top-left-radius> from [initial] to [20px] at (-0.3) should be [0px]PASS
CSS Animations: property <border-top-left-radius> from [initial] to [20px] at (0) should be [0px]PASS
CSS Animations: property <border-top-left-radius> from [initial] to [20px] at (0.3) should be [6px]PASS
CSS Animations: property <border-top-left-radius> from [initial] to [20px] at (0.6) should be [12px]PASS
CSS Animations: property <border-top-left-radius> from [initial] to [20px] at (1) should be [20px]PASS
CSS Animations: property <border-top-left-radius> from [initial] to [20px] at (1.5) should be [30px]PASS
Web Animations: property <border-top-left-radius> from [initial] to [20px] at (-0.3) should be [0px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [initial] to [20px] at (0) should be [0px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [initial] to [20px] at (0.3) should be [6px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [initial] to [20px] at (0.6) should be [12px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [initial] to [20px] at (1) should be [20px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [initial] to [20px] at (1.5) should be [30px]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <border-top-left-radius> from [inherit] to [20px] at (-0.3) should be [33px]PASS
CSS Transitions: property <border-top-left-radius> from [inherit] to [20px] at (0) should be [30px]PASS
CSS Transitions: property <border-top-left-radius> from [inherit] to [20px] at (0.3) should be [27px]PASS
CSS Transitions: property <border-top-left-radius> from [inherit] to [20px] at (0.6) should be [24px]PASS
CSS Transitions: property <border-top-left-radius> from [inherit] to [20px] at (1) should be [20px]PASS
CSS Transitions: property <border-top-left-radius> from [inherit] to [20px] at (1.5) should be [15px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [inherit] to [20px] at (-0.3) should be [33px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [inherit] to [20px] at (0) should be [30px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [inherit] to [20px] at (0.3) should be [27px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [inherit] to [20px] at (0.6) should be [24px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [inherit] to [20px] at (1) should be [20px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [inherit] to [20px] at (1.5) should be [15px]PASS
CSS Animations: property <border-top-left-radius> from [inherit] to [20px] at (-0.3) should be [33px]PASS
CSS Animations: property <border-top-left-radius> from [inherit] to [20px] at (0) should be [30px]PASS
CSS Animations: property <border-top-left-radius> from [inherit] to [20px] at (0.3) should be [27px]PASS
CSS Animations: property <border-top-left-radius> from [inherit] to [20px] at (0.6) should be [24px]PASS
CSS Animations: property <border-top-left-radius> from [inherit] to [20px] at (1) should be [20px]PASS
CSS Animations: property <border-top-left-radius> from [inherit] to [20px] at (1.5) should be [15px]PASS
Web Animations: property <border-top-left-radius> from [inherit] to [20px] at (-0.3) should be [33px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [inherit] to [20px] at (0) should be [30px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [inherit] to [20px] at (0.3) should be [27px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [inherit] to [20px] at (0.6) should be [24px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [inherit] to [20px] at (1) should be [20px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [inherit] to [20px] at (1.5) should be [15px]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <border-top-left-radius> from [unset] to [20px] at (-0.3) should be [0px]PASS
CSS Transitions: property <border-top-left-radius> from [unset] to [20px] at (0) should be [0px]PASS
CSS Transitions: property <border-top-left-radius> from [unset] to [20px] at (0.3) should be [6px]PASS
CSS Transitions: property <border-top-left-radius> from [unset] to [20px] at (0.6) should be [12px]PASS
CSS Transitions: property <border-top-left-radius> from [unset] to [20px] at (1) should be [20px]PASS
CSS Transitions: property <border-top-left-radius> from [unset] to [20px] at (1.5) should be [30px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [unset] to [20px] at (-0.3) should be [0px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [unset] to [20px] at (0) should be [0px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [unset] to [20px] at (0.3) should be [6px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [unset] to [20px] at (0.6) should be [12px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [unset] to [20px] at (1) should be [20px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [unset] to [20px] at (1.5) should be [30px]PASS
CSS Animations: property <border-top-left-radius> from [unset] to [20px] at (-0.3) should be [0px]PASS
CSS Animations: property <border-top-left-radius> from [unset] to [20px] at (0) should be [0px]PASS
CSS Animations: property <border-top-left-radius> from [unset] to [20px] at (0.3) should be [6px]PASS
CSS Animations: property <border-top-left-radius> from [unset] to [20px] at (0.6) should be [12px]PASS
CSS Animations: property <border-top-left-radius> from [unset] to [20px] at (1) should be [20px]PASS
CSS Animations: property <border-top-left-radius> from [unset] to [20px] at (1.5) should be [30px]PASS
Web Animations: property <border-top-left-radius> from [unset] to [20px] at (-0.3) should be [0px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [unset] to [20px] at (0) should be [0px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [unset] to [20px] at (0.3) should be [6px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [unset] to [20px] at (0.6) should be [12px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [unset] to [20px] at (1) should be [20px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [unset] to [20px] at (1.5) should be [30px]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <border-top-left-radius> from [10px] to [50px] at (-0.3) should be [0px]PASS
CSS Transitions: property <border-top-left-radius> from [10px] to [50px] at (0) should be [10px]PASS
CSS Transitions: property <border-top-left-radius> from [10px] to [50px] at (0.3) should be [22px]PASS
CSS Transitions: property <border-top-left-radius> from [10px] to [50px] at (0.6) should be [34px]PASS
CSS Transitions: property <border-top-left-radius> from [10px] to [50px] at (1) should be [50px]PASS
CSS Transitions: property <border-top-left-radius> from [10px] to [50px] at (1.5) should be [70px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [10px] to [50px] at (-0.3) should be [0px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [10px] to [50px] at (0) should be [10px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [10px] to [50px] at (0.3) should be [22px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [10px] to [50px] at (0.6) should be [34px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [10px] to [50px] at (1) should be [50px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [10px] to [50px] at (1.5) should be [70px]PASS
CSS Animations: property <border-top-left-radius> from [10px] to [50px] at (-0.3) should be [0px]PASS
CSS Animations: property <border-top-left-radius> from [10px] to [50px] at (0) should be [10px]PASS
CSS Animations: property <border-top-left-radius> from [10px] to [50px] at (0.3) should be [22px]PASS
CSS Animations: property <border-top-left-radius> from [10px] to [50px] at (0.6) should be [34px]PASS
CSS Animations: property <border-top-left-radius> from [10px] to [50px] at (1) should be [50px]PASS
CSS Animations: property <border-top-left-radius> from [10px] to [50px] at (1.5) should be [70px]PASS
Web Animations: property <border-top-left-radius> from [10px] to [50px] at (-0.3) should be [0px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [10px] to [50px] at (0) should be [10px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [10px] to [50px] at (0.3) should be [22px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [10px] to [50px] at (0.6) should be [34px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [10px] to [50px] at (1) should be [50px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [10px] to [50px] at (1.5) should be [70px]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <border-top-left-radius> from [10px] to [100%] at (-0.3) should be [calc(13px + -30%)]PASS
CSS Transitions: property <border-top-left-radius> from [10px] to [100%] at (0) should be [calc(10px + 0%)]PASS
CSS Transitions: property <border-top-left-radius> from [10px] to [100%] at (0.3) should be [calc(7px + 30%)]PASS
CSS Transitions: property <border-top-left-radius> from [10px] to [100%] at (0.6) should be [calc(4px + 60%)]PASS
CSS Transitions: property <border-top-left-radius> from [10px] to [100%] at (1) should be [100%]PASS
CSS Transitions: property <border-top-left-radius> from [10px] to [100%] at (1.5) should be [calc(-5px + 150%)]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [10px] to [100%] at (-0.3) should be [calc(13px + -30%)]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [10px] to [100%] at (0) should be [calc(10px + 0%)]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [10px] to [100%] at (0.3) should be [calc(7px + 30%)]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [10px] to [100%] at (0.6) should be [calc(4px + 60%)]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [10px] to [100%] at (1) should be [100%]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [10px] to [100%] at (1.5) should be [calc(-5px + 150%)]PASS
CSS Animations: property <border-top-left-radius> from [10px] to [100%] at (-0.3) should be [calc(13px + -30%)]PASS
CSS Animations: property <border-top-left-radius> from [10px] to [100%] at (0) should be [calc(10px + 0%)]PASS
CSS Animations: property <border-top-left-radius> from [10px] to [100%] at (0.3) should be [calc(7px + 30%)]PASS
CSS Animations: property <border-top-left-radius> from [10px] to [100%] at (0.6) should be [calc(4px + 60%)]PASS
CSS Animations: property <border-top-left-radius> from [10px] to [100%] at (1) should be [100%]PASS
CSS Animations: property <border-top-left-radius> from [10px] to [100%] at (1.5) should be [calc(-5px + 150%)]PASS
Web Animations: property <border-top-left-radius> from [10px] to [100%] at (-0.3) should be [calc(13px + -30%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [10px] to [100%] at (0) should be [calc(10px + 0%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [10px] to [100%] at (0.3) should be [calc(7px + 30%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [10px] to [100%] at (0.6) should be [calc(4px + 60%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [10px] to [100%] at (1) should be [100%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [10px] to [100%] at (1.5) should be [calc(-5px + 150%)]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <border-top-left-radius> from [20px] to [10px 30px] at (-2) should be [40px 0px]PASS
CSS Transitions: property <border-top-left-radius> from [20px] to [10px 30px] at (-0.3) should be [23px 17px]PASS
CSS Transitions: property <border-top-left-radius> from [20px] to [10px 30px] at (0) should be [20px]PASS
CSS Transitions: property <border-top-left-radius> from [20px] to [10px 30px] at (0.3) should be [17px 23px]PASS
CSS Transitions: property <border-top-left-radius> from [20px] to [10px 30px] at (0.6) should be [14px 26px]PASS
CSS Transitions: property <border-top-left-radius> from [20px] to [10px 30px] at (1) should be [10px 30px]PASS
CSS Transitions: property <border-top-left-radius> from [20px] to [10px 30px] at (1.5) should be [5px 35px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [20px] to [10px 30px] at (-2) should be [40px 0px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [20px] to [10px 30px] at (-0.3) should be [23px 17px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [20px] to [10px 30px] at (0) should be [20px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [20px] to [10px 30px] at (0.3) should be [17px 23px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [20px] to [10px 30px] at (0.6) should be [14px 26px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [20px] to [10px 30px] at (1) should be [10px 30px]PASS
CSS Transitions with transition: all: property <border-top-left-radius> from [20px] to [10px 30px] at (1.5) should be [5px 35px]PASS
CSS Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (-2) should be [40px 0px]PASS
CSS Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (-0.3) should be [23px 17px]PASS
CSS Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (0) should be [20px]PASS
CSS Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (0.3) should be [17px 23px]PASS
CSS Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (0.6) should be [14px 26px]PASS
CSS Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (1) should be [10px 30px]PASS
CSS Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (1.5) should be [5px 35px]PASS
Web Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (-2) should be [40px 0px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (-0.3) should be [23px 17px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (0) should be [20px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (0.3) should be [17px 23px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (0.6) should be [14px 26px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (1) should be [10px 30px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <border-top-left-radius> from [20px] to [10px 30px] at (1.5) should be [5px 35px]FAILassert_true: Web Animations should be supported expected true got false

/css/css-backgrounds/animations/border-radius-interpolation.html

<!DOCTYPE html>
<meta charset="UTF-8">
<title>border-radius interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#border-radius">
<meta name="assert" content="border-radius supports animation by computed value">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>

<style>
.parent {
  border-radius: 30px;
}
.target {
  width: 80px;
  height: 80px;
  display: inline-block;
  background-color: black;
  margin-right: 5px;
  border-radius: 10px;
}
.expected {
  background-color: green;
  margin-right: 15px;
}
</style>

<body></body>

<script>
// As per https://bugzilla.mozilla.org/show_bug.cgi?id=137688, Firefox does not
// support getComputedStyle for shorthands. As such, we have one test for this
// which explicitly checks the shorthand variant, but most tests use one of the
// longhands instead.
function compareNotEmpty(actual, expected) {
  assert_equals(actual, expected);
  assert_not_equals(actual, '');
}

test_interpolation({
  property: 'border-radius',
  from: '20px 40px 60px 80px / 120px 140px 160px 180px',
  to: '30px 50px 70px 90px / 130px 150px 170px 190px',
  comparisonFunction: compareNotEmpty,
}, [
  {at: -0.3, expect: '17px 37px 57px 77px / 117px 137px 157px 177px'},
  {at: 0, expect: '20px 40px 60px 80px / 120px 140px 160px 180px'},
  {at: 0.3, expect: '23px 43px 63px 83px / 123px 143px 163px 183px'},
  {at: 0.6, expect: '26px 46px 66px 86px / 126px 146px 166px 186px'},
  {at: 1, expect: '30px 50px 70px 90px / 130px 150px 170px 190px'},
  {at: 1.5, expect: '35px 55px 75px 95px / 135px 155px 175px 195px'}
]);

test_interpolation({
  property: 'border-top-left-radius',
  from: neutralKeyframe,
  to: '20px',
}, [
  {at: -0.3, expect: '7px'},
  {at: 0, expect: '10px'},
  {at: 0.3, expect: '13px'},
  {at: 0.6, expect: '16px'},
  {at: 1, expect: '20px'},
  {at: 1.5, expect: '25px'},
]);
test_interpolation({
  property: 'border-top-left-radius',
  from: 'initial',
  to: '20px',
}, [
  {at: -0.3, expect: '0px'},
  {at: 0, expect: '0px'},
  {at: 0.3, expect: '6px'},
  {at: 0.6, expect: '12px'},
  {at: 1, expect: '20px'},
  {at: 1.5, expect: '30px'},
]);
test_interpolation({
  property: 'border-top-left-radius',
  from: 'inherit',
  to: '20px',
}, [
  {at: -0.3, expect: '33px'},
  {at: 0, expect: '30px'},
  {at: 0.3, expect: '27px'},
  {at: 0.6, expect: '24px'},
  {at: 1, expect: '20px'},
  {at: 1.5, expect: '15px'},
]);
test_interpolation({
  property: 'border-top-left-radius',
  from: 'unset',
  to: '20px',
}, [
  {at: -0.3, expect: '0px'},
  {at: 0, expect: '0px'},
  {at: 0.3, expect: '6px'},
  {at: 0.6, expect: '12px'},
  {at: 1, expect: '20px'},
  {at: 1.5, expect: '30px'},
]);
test_interpolation({
  property: 'border-top-left-radius',
  from: '10px',
  to: '50px'
}, [
  {at: -0.3, expect: '0px'}, // CSS border-top-left-radius can't be negative.
  {at: 0, expect: '10px'},
  {at: 0.3, expect: '22px'},
  {at: 0.6, expect: '34px'},
  {at: 1, expect: '50px'},
  {at: 1.5, expect: '70px'},
]);
test_interpolation({
  property: 'border-top-left-radius',
  from: '10px',
  to: '100%'
}, [
  {at: -0.3, expect: 'calc(13px + -30%)'},
  {at: 0, expect: 'calc(10px + 0%)'},
  {at: 0.3, expect: 'calc(7px + 30%)'},
  {at: 0.6, expect: 'calc(4px + 60%)'},
  {at: 1, expect: '100%'},
  {at: 1.5, expect: 'calc(-5px + 150%)'},
]);

test_interpolation({
  property: 'border-top-left-radius',
  from: '20px',
  to: '10px 30px'
}, [
  {at: -2, expect: '40px 0px'},
  {at: -0.3, expect: '23px 17px'},
  {at: 0, expect: '20px'},
  {at: 0.3, expect: '17px 23px'},
  {at: 0.6, expect: '14px 26px'},
  {at: 1, expect: '10px 30px'},
  {at: 1.5, expect: '5px 35px'}
]);
</script>