wpt / css / css-backgrounds / animations / background-position-origin-interpolation.html

Status: FAIL | Duration: 1092ms | Subtests: 210/280 | Open test on wpt.live | wpt.fyi

TestTest SourceSubtests (210/280)

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

SubtestStatusMessage
CSS Transitions: property <background-position> from neutral to [left 20px top 20px] at (0) should be [10px 10px]PASS
CSS Transitions: property <background-position> from neutral to [left 20px top 20px] at (0.25) should be [12.5px 12.5px]PASS
CSS Transitions: property <background-position> from neutral to [left 20px top 20px] at (0.5) should be [15px 15px]PASS
CSS Transitions: property <background-position> from neutral to [left 20px top 20px] at (0.75) should be [17.5px 17.5px]PASS
CSS Transitions: property <background-position> from neutral to [left 20px top 20px] at (1) should be [20px 20px]PASS
CSS Transitions with transition: all: property <background-position> from neutral to [left 20px top 20px] at (0) should be [10px 10px]PASS
CSS Transitions with transition: all: property <background-position> from neutral to [left 20px top 20px] at (0.25) should be [12.5px 12.5px]PASS
CSS Transitions with transition: all: property <background-position> from neutral to [left 20px top 20px] at (0.5) should be [15px 15px]PASS
CSS Transitions with transition: all: property <background-position> from neutral to [left 20px top 20px] at (0.75) should be [17.5px 17.5px]PASS
CSS Transitions with transition: all: property <background-position> from neutral to [left 20px top 20px] at (1) should be [20px 20px]PASS
CSS Animations: property <background-position> from neutral to [left 20px top 20px] at (0) should be [10px 10px]PASS
CSS Animations: property <background-position> from neutral to [left 20px top 20px] at (0.25) should be [12.5px 12.5px]PASS
CSS Animations: property <background-position> from neutral to [left 20px top 20px] at (0.5) should be [15px 15px]PASS
CSS Animations: property <background-position> from neutral to [left 20px top 20px] at (0.75) should be [17.5px 17.5px]PASS
CSS Animations: property <background-position> from neutral to [left 20px top 20px] at (1) should be [20px 20px]PASS
Web Animations: property <background-position> from neutral to [left 20px top 20px] at (0) should be [10px 10px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from neutral to [left 20px top 20px] at (0.25) should be [12.5px 12.5px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from neutral to [left 20px top 20px] at (0.5) should be [15px 15px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from neutral to [left 20px top 20px] at (0.75) should be [17.5px 17.5px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from neutral to [left 20px top 20px] at (1) should be [20px 20px]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [initial] to [left 20px top 20px] at (0) should be [0% 0%]PASS
CSS Transitions: property <background-position> from [initial] to [left 20px top 20px] at (0.25) should be [calc(0% + 5px) calc(0% + 5px)]PASS
CSS Transitions: property <background-position> from [initial] to [left 20px top 20px] at (0.5) should be [calc(0% + 10px) calc(0% + 10px)]PASS
CSS Transitions: property <background-position> from [initial] to [left 20px top 20px] at (0.75) should be [calc(0% + 15px) calc(0% + 15px)]PASS
CSS Transitions: property <background-position> from [initial] to [left 20px top 20px] at (1) should be [calc(0% + 20px) calc(0% + 20px)]PASS
CSS Transitions with transition: all: property <background-position> from [initial] to [left 20px top 20px] at (0) should be [0% 0%]PASS
CSS Transitions with transition: all: property <background-position> from [initial] to [left 20px top 20px] at (0.25) should be [calc(0% + 5px) calc(0% + 5px)]PASS
CSS Transitions with transition: all: property <background-position> from [initial] to [left 20px top 20px] at (0.5) should be [calc(0% + 10px) calc(0% + 10px)]PASS
CSS Transitions with transition: all: property <background-position> from [initial] to [left 20px top 20px] at (0.75) should be [calc(0% + 15px) calc(0% + 15px)]PASS
CSS Transitions with transition: all: property <background-position> from [initial] to [left 20px top 20px] at (1) should be [calc(0% + 20px) calc(0% + 20px)]PASS
CSS Animations: property <background-position> from [initial] to [left 20px top 20px] at (0) should be [0% 0%]PASS
CSS Animations: property <background-position> from [initial] to [left 20px top 20px] at (0.25) should be [calc(0% + 5px) calc(0% + 5px)]PASS
CSS Animations: property <background-position> from [initial] to [left 20px top 20px] at (0.5) should be [calc(0% + 10px) calc(0% + 10px)]PASS
CSS Animations: property <background-position> from [initial] to [left 20px top 20px] at (0.75) should be [calc(0% + 15px) calc(0% + 15px)]PASS
CSS Animations: property <background-position> from [initial] to [left 20px top 20px] at (1) should be [calc(0% + 20px) calc(0% + 20px)]PASS
Web Animations: property <background-position> from [initial] to [left 20px top 20px] at (0) should be [0% 0%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [initial] to [left 20px top 20px] at (0.25) should be [calc(0% + 5px) calc(0% + 5px)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [initial] to [left 20px top 20px] at (0.5) should be [calc(0% + 10px) calc(0% + 10px)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [initial] to [left 20px top 20px] at (0.75) should be [calc(0% + 15px) calc(0% + 15px)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [initial] to [left 20px top 20px] at (1) should be [calc(0% + 20px) calc(0% + 20px)]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [inherit] to [left 20px top 20px] at (0) should be [80px 80px]PASS
CSS Transitions: property <background-position> from [inherit] to [left 20px top 20px] at (0.25) should be [65px 65px]PASS
CSS Transitions: property <background-position> from [inherit] to [left 20px top 20px] at (0.5) should be [50px 50px]PASS
CSS Transitions: property <background-position> from [inherit] to [left 20px top 20px] at (0.75) should be [35px 35px]PASS
CSS Transitions: property <background-position> from [inherit] to [left 20px top 20px] at (1) should be [20px 20px]PASS
CSS Transitions with transition: all: property <background-position> from [inherit] to [left 20px top 20px] at (0) should be [80px 80px]PASS
CSS Transitions with transition: all: property <background-position> from [inherit] to [left 20px top 20px] at (0.25) should be [65px 65px]PASS
CSS Transitions with transition: all: property <background-position> from [inherit] to [left 20px top 20px] at (0.5) should be [50px 50px]PASS
CSS Transitions with transition: all: property <background-position> from [inherit] to [left 20px top 20px] at (0.75) should be [35px 35px]PASS
CSS Transitions with transition: all: property <background-position> from [inherit] to [left 20px top 20px] at (1) should be [20px 20px]PASS
CSS Animations: property <background-position> from [inherit] to [left 20px top 20px] at (0) should be [80px 80px]PASS
CSS Animations: property <background-position> from [inherit] to [left 20px top 20px] at (0.25) should be [65px 65px]PASS
CSS Animations: property <background-position> from [inherit] to [left 20px top 20px] at (0.5) should be [50px 50px]PASS
CSS Animations: property <background-position> from [inherit] to [left 20px top 20px] at (0.75) should be [35px 35px]PASS
CSS Animations: property <background-position> from [inherit] to [left 20px top 20px] at (1) should be [20px 20px]PASS
Web Animations: property <background-position> from [inherit] to [left 20px top 20px] at (0) should be [80px 80px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [inherit] to [left 20px top 20px] at (0.25) should be [65px 65px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [inherit] to [left 20px top 20px] at (0.5) should be [50px 50px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [inherit] to [left 20px top 20px] at (0.75) should be [35px 35px]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [inherit] to [left 20px top 20px] at (1) should be [20px 20px]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [unset] to [left 20px top 20px] at (0) should be [0% 0%]PASS
CSS Transitions: property <background-position> from [unset] to [left 20px top 20px] at (0.25) should be [calc(0% + 5px) calc(0% + 5px)]PASS
CSS Transitions: property <background-position> from [unset] to [left 20px top 20px] at (0.5) should be [calc(0% + 10px) calc(0% + 10px)]PASS
CSS Transitions: property <background-position> from [unset] to [left 20px top 20px] at (0.75) should be [calc(0% + 15px) calc(0% + 15px)]PASS
CSS Transitions: property <background-position> from [unset] to [left 20px top 20px] at (1) should be [calc(0% + 20px) calc(0% + 20px)]PASS
CSS Transitions with transition: all: property <background-position> from [unset] to [left 20px top 20px] at (0) should be [0% 0%]PASS
CSS Transitions with transition: all: property <background-position> from [unset] to [left 20px top 20px] at (0.25) should be [calc(0% + 5px) calc(0% + 5px)]PASS
CSS Transitions with transition: all: property <background-position> from [unset] to [left 20px top 20px] at (0.5) should be [calc(0% + 10px) calc(0% + 10px)]PASS
CSS Transitions with transition: all: property <background-position> from [unset] to [left 20px top 20px] at (0.75) should be [calc(0% + 15px) calc(0% + 15px)]PASS
CSS Transitions with transition: all: property <background-position> from [unset] to [left 20px top 20px] at (1) should be [calc(0% + 20px) calc(0% + 20px)]PASS
CSS Animations: property <background-position> from [unset] to [left 20px top 20px] at (0) should be [0% 0%]PASS
CSS Animations: property <background-position> from [unset] to [left 20px top 20px] at (0.25) should be [calc(0% + 5px) calc(0% + 5px)]PASS
CSS Animations: property <background-position> from [unset] to [left 20px top 20px] at (0.5) should be [calc(0% + 10px) calc(0% + 10px)]PASS
CSS Animations: property <background-position> from [unset] to [left 20px top 20px] at (0.75) should be [calc(0% + 15px) calc(0% + 15px)]PASS
CSS Animations: property <background-position> from [unset] to [left 20px top 20px] at (1) should be [calc(0% + 20px) calc(0% + 20px)]PASS
Web Animations: property <background-position> from [unset] to [left 20px top 20px] at (0) should be [0% 0%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [unset] to [left 20px top 20px] at (0.25) should be [calc(0% + 5px) calc(0% + 5px)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [unset] to [left 20px top 20px] at (0.5) should be [calc(0% + 10px) calc(0% + 10px)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [unset] to [left 20px top 20px] at (0.75) should be [calc(0% + 15px) calc(0% + 15px)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [unset] to [left 20px top 20px] at (1) should be [calc(0% + 20px) calc(0% + 20px)]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [center center] to [left 20px top 20px] at (0) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center center] to [left 20px top 20px] at (0.25) should be [calc(5px + 37.5%) calc(5px + 37.5%)]PASS
CSS Transitions: property <background-position> from [center center] to [left 20px top 20px] at (0.5) should be [calc(10px + 25%) calc(10px + 25%)]PASS
CSS Transitions: property <background-position> from [center center] to [left 20px top 20px] at (0.75) should be [calc(15px + 12.5%) calc(15px + 12.5%)]PASS
CSS Transitions: property <background-position> from [center center] to [left 20px top 20px] at (1) should be [calc(0% + 20px) calc(0% + 20px)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px top 20px] at (0) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px top 20px] at (0.25) should be [calc(5px + 37.5%) calc(5px + 37.5%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px top 20px] at (0.5) should be [calc(10px + 25%) calc(10px + 25%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px top 20px] at (0.75) should be [calc(15px + 12.5%) calc(15px + 12.5%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px top 20px] at (1) should be [calc(0% + 20px) calc(0% + 20px)]PASS
CSS Animations: property <background-position> from [center center] to [left 20px top 20px] at (0) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [left 20px top 20px] at (0.25) should be [calc(5px + 37.5%) calc(5px + 37.5%)]PASS
CSS Animations: property <background-position> from [center center] to [left 20px top 20px] at (0.5) should be [calc(10px + 25%) calc(10px + 25%)]PASS
CSS Animations: property <background-position> from [center center] to [left 20px top 20px] at (0.75) should be [calc(15px + 12.5%) calc(15px + 12.5%)]PASS
CSS Animations: property <background-position> from [center center] to [left 20px top 20px] at (1) should be [calc(0% + 20px) calc(0% + 20px)]PASS
Web Animations: property <background-position> from [center center] to [left 20px top 20px] at (0) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [left 20px top 20px] at (0.25) should be [calc(5px + 37.5%) calc(5px + 37.5%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [left 20px top 20px] at (0.5) should be [calc(10px + 25%) calc(10px + 25%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [left 20px top 20px] at (0.75) should be [calc(15px + 12.5%) calc(15px + 12.5%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [left 20px top 20px] at (1) should be [calc(0% + 20px) calc(0% + 20px)]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [center center] to [center top 20px] at (0) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center center] to [center top 20px] at (0.25) should be [50% calc(5px + 37.5%)]PASS
CSS Transitions: property <background-position> from [center center] to [center top 20px] at (0.5) should be [50% calc(10px + 25%)]PASS
CSS Transitions: property <background-position> from [center center] to [center top 20px] at (0.75) should be [50% calc(15px + 12.5%)]PASS
CSS Transitions: property <background-position> from [center center] to [center top 20px] at (1) should be [50% calc(0% + 20px)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center top 20px] at (0) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center top 20px] at (0.25) should be [50% calc(5px + 37.5%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center top 20px] at (0.5) should be [50% calc(10px + 25%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center top 20px] at (0.75) should be [50% calc(15px + 12.5%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center top 20px] at (1) should be [50% calc(0% + 20px)]PASS
CSS Animations: property <background-position> from [center center] to [center top 20px] at (0) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [center top 20px] at (0.25) should be [50% calc(5px + 37.5%)]PASS
CSS Animations: property <background-position> from [center center] to [center top 20px] at (0.5) should be [50% calc(10px + 25%)]PASS
CSS Animations: property <background-position> from [center center] to [center top 20px] at (0.75) should be [50% calc(15px + 12.5%)]PASS
CSS Animations: property <background-position> from [center center] to [center top 20px] at (1) should be [50% calc(0% + 20px)]PASS
Web Animations: property <background-position> from [center center] to [center top 20px] at (0) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [center top 20px] at (0.25) should be [50% calc(5px + 37.5%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [center top 20px] at (0.5) should be [50% calc(10px + 25%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [center top 20px] at (0.75) should be [50% calc(15px + 12.5%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [center top 20px] at (1) should be [50% calc(0% + 20px)]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [center center] to [right 20px top 20px] at (0) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center center] to [right 20px top 20px] at (0.25) should be [calc(-5px + 62.5%) calc(5px + 37.5%)]PASS
CSS Transitions: property <background-position> from [center center] to [right 20px top 20px] at (0.5) should be [calc(-10px + 75%) calc(10px + 25%)]PASS
CSS Transitions: property <background-position> from [center center] to [right 20px top 20px] at (0.75) should be [calc(-15px + 87.5%) calc(15px + 12.5%)]PASS
CSS Transitions: property <background-position> from [center center] to [right 20px top 20px] at (1) should be [calc(-20px + 100%) calc(0% + 20px)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px top 20px] at (0) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px top 20px] at (0.25) should be [calc(-5px + 62.5%) calc(5px + 37.5%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px top 20px] at (0.5) should be [calc(-10px + 75%) calc(10px + 25%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px top 20px] at (0.75) should be [calc(-15px + 87.5%) calc(15px + 12.5%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px top 20px] at (1) should be [calc(-20px + 100%) calc(0% + 20px)]PASS
CSS Animations: property <background-position> from [center center] to [right 20px top 20px] at (0) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [right 20px top 20px] at (0.25) should be [calc(-5px + 62.5%) calc(5px + 37.5%)]PASS
CSS Animations: property <background-position> from [center center] to [right 20px top 20px] at (0.5) should be [calc(-10px + 75%) calc(10px + 25%)]PASS
CSS Animations: property <background-position> from [center center] to [right 20px top 20px] at (0.75) should be [calc(-15px + 87.5%) calc(15px + 12.5%)]PASS
CSS Animations: property <background-position> from [center center] to [right 20px top 20px] at (1) should be [calc(-20px + 100%) calc(0% + 20px)]PASS
Web Animations: property <background-position> from [center center] to [right 20px top 20px] at (0) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [right 20px top 20px] at (0.25) should be [calc(-5px + 62.5%) calc(5px + 37.5%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [right 20px top 20px] at (0.5) should be [calc(-10px + 75%) calc(10px + 25%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [right 20px top 20px] at (0.75) should be [calc(-15px + 87.5%) calc(15px + 12.5%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [right 20px top 20px] at (1) should be [calc(-20px + 100%) calc(0% + 20px)]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [center center] to [left 20px center] at (0) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center center] to [left 20px center] at (0.25) should be [calc(5px + 37.5%) 50%]PASS
CSS Transitions: property <background-position> from [center center] to [left 20px center] at (0.5) should be [calc(10px + 25%) 50%]PASS
CSS Transitions: property <background-position> from [center center] to [left 20px center] at (0.75) should be [calc(15px + 12.5%) 50%]PASS
CSS Transitions: property <background-position> from [center center] to [left 20px center] at (1) should be [calc(0% + 20px) 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px center] at (0) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px center] at (0.25) should be [calc(5px + 37.5%) 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px center] at (0.5) should be [calc(10px + 25%) 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px center] at (0.75) should be [calc(15px + 12.5%) 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px center] at (1) should be [calc(0% + 20px) 50%]PASS
CSS Animations: property <background-position> from [center center] to [left 20px center] at (0) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [left 20px center] at (0.25) should be [calc(5px + 37.5%) 50%]PASS
CSS Animations: property <background-position> from [center center] to [left 20px center] at (0.5) should be [calc(10px + 25%) 50%]PASS
CSS Animations: property <background-position> from [center center] to [left 20px center] at (0.75) should be [calc(15px + 12.5%) 50%]PASS
CSS Animations: property <background-position> from [center center] to [left 20px center] at (1) should be [calc(0% + 20px) 50%]PASS
Web Animations: property <background-position> from [center center] to [left 20px center] at (0) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [left 20px center] at (0.25) should be [calc(5px + 37.5%) 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [left 20px center] at (0.5) should be [calc(10px + 25%) 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [left 20px center] at (0.75) should be [calc(15px + 12.5%) 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [left 20px center] at (1) should be [calc(0% + 20px) 50%]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [center center] to [center center] at (0) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center center] to [center center] at (0.25) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center center] to [center center] at (0.5) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center center] to [center center] at (0.75) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center center] to [center center] at (1) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center center] at (0) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center center] at (0.25) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center center] at (0.5) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center center] at (0.75) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center center] at (1) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [center center] at (0) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [center center] at (0.25) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [center center] at (0.5) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [center center] at (0.75) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [center center] at (1) should be [50% 50%]PASS
Web Animations: property <background-position> from [center center] to [center center] at (0) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [center center] at (0.25) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [center center] at (0.5) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [center center] at (0.75) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [center center] at (1) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [center center] to [right 20px center] at (0) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center center] to [right 20px center] at (0.25) should be [calc(-5px + 62.5%) 50%]PASS
CSS Transitions: property <background-position> from [center center] to [right 20px center] at (0.5) should be [calc(-10px + 75%) 50%]PASS
CSS Transitions: property <background-position> from [center center] to [right 20px center] at (0.75) should be [calc(-15px + 87.5%) 50%]PASS
CSS Transitions: property <background-position> from [center center] to [right 20px center] at (1) should be [calc(-20px + 100%) 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px center] at (0) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px center] at (0.25) should be [calc(-5px + 62.5%) 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px center] at (0.5) should be [calc(-10px + 75%) 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px center] at (0.75) should be [calc(-15px + 87.5%) 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px center] at (1) should be [calc(-20px + 100%) 50%]PASS
CSS Animations: property <background-position> from [center center] to [right 20px center] at (0) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [right 20px center] at (0.25) should be [calc(-5px + 62.5%) 50%]PASS
CSS Animations: property <background-position> from [center center] to [right 20px center] at (0.5) should be [calc(-10px + 75%) 50%]PASS
CSS Animations: property <background-position> from [center center] to [right 20px center] at (0.75) should be [calc(-15px + 87.5%) 50%]PASS
CSS Animations: property <background-position> from [center center] to [right 20px center] at (1) should be [calc(-20px + 100%) 50%]PASS
Web Animations: property <background-position> from [center center] to [right 20px center] at (0) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [right 20px center] at (0.25) should be [calc(-5px + 62.5%) 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [right 20px center] at (0.5) should be [calc(-10px + 75%) 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [right 20px center] at (0.75) should be [calc(-15px + 87.5%) 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [right 20px center] at (1) should be [calc(-20px + 100%) 50%]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [center center] to [left 20px bottom 20px] at (0) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center center] to [left 20px bottom 20px] at (0.25) should be [calc(5px + 37.5%) calc(-5px + 62.5%)]PASS
CSS Transitions: property <background-position> from [center center] to [left 20px bottom 20px] at (0.5) should be [calc(10px + 25%) calc(-10px + 75%)]PASS
CSS Transitions: property <background-position> from [center center] to [left 20px bottom 20px] at (0.75) should be [calc(15px + 12.5%) calc(-15px + 87.5%)]PASS
CSS Transitions: property <background-position> from [center center] to [left 20px bottom 20px] at (1) should be [calc(0% + 20px) calc(-20px + 100%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px bottom 20px] at (0) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px bottom 20px] at (0.25) should be [calc(5px + 37.5%) calc(-5px + 62.5%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px bottom 20px] at (0.5) should be [calc(10px + 25%) calc(-10px + 75%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px bottom 20px] at (0.75) should be [calc(15px + 12.5%) calc(-15px + 87.5%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [left 20px bottom 20px] at (1) should be [calc(0% + 20px) calc(-20px + 100%)]PASS
CSS Animations: property <background-position> from [center center] to [left 20px bottom 20px] at (0) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [left 20px bottom 20px] at (0.25) should be [calc(5px + 37.5%) calc(-5px + 62.5%)]PASS
CSS Animations: property <background-position> from [center center] to [left 20px bottom 20px] at (0.5) should be [calc(10px + 25%) calc(-10px + 75%)]PASS
CSS Animations: property <background-position> from [center center] to [left 20px bottom 20px] at (0.75) should be [calc(15px + 12.5%) calc(-15px + 87.5%)]PASS
CSS Animations: property <background-position> from [center center] to [left 20px bottom 20px] at (1) should be [calc(0% + 20px) calc(-20px + 100%)]PASS
Web Animations: property <background-position> from [center center] to [left 20px bottom 20px] at (0) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [left 20px bottom 20px] at (0.25) should be [calc(5px + 37.5%) calc(-5px + 62.5%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [left 20px bottom 20px] at (0.5) should be [calc(10px + 25%) calc(-10px + 75%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [left 20px bottom 20px] at (0.75) should be [calc(15px + 12.5%) calc(-15px + 87.5%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [left 20px bottom 20px] at (1) should be [calc(0% + 20px) calc(-20px + 100%)]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [center center] to [center bottom 20px] at (0) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center center] to [center bottom 20px] at (0.25) should be [50% calc(-5px + 62.5%)]PASS
CSS Transitions: property <background-position> from [center center] to [center bottom 20px] at (0.5) should be [50% calc(-10px + 75%)]PASS
CSS Transitions: property <background-position> from [center center] to [center bottom 20px] at (0.75) should be [50% calc(-15px + 87.5%)]PASS
CSS Transitions: property <background-position> from [center center] to [center bottom 20px] at (1) should be [50% calc(-20px + 100%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center bottom 20px] at (0) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center bottom 20px] at (0.25) should be [50% calc(-5px + 62.5%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center bottom 20px] at (0.5) should be [50% calc(-10px + 75%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center bottom 20px] at (0.75) should be [50% calc(-15px + 87.5%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [center bottom 20px] at (1) should be [50% calc(-20px + 100%)]PASS
CSS Animations: property <background-position> from [center center] to [center bottom 20px] at (0) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [center bottom 20px] at (0.25) should be [50% calc(-5px + 62.5%)]PASS
CSS Animations: property <background-position> from [center center] to [center bottom 20px] at (0.5) should be [50% calc(-10px + 75%)]PASS
CSS Animations: property <background-position> from [center center] to [center bottom 20px] at (0.75) should be [50% calc(-15px + 87.5%)]PASS
CSS Animations: property <background-position> from [center center] to [center bottom 20px] at (1) should be [50% calc(-20px + 100%)]PASS
Web Animations: property <background-position> from [center center] to [center bottom 20px] at (0) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [center bottom 20px] at (0.25) should be [50% calc(-5px + 62.5%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [center bottom 20px] at (0.5) should be [50% calc(-10px + 75%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [center bottom 20px] at (0.75) should be [50% calc(-15px + 87.5%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [center bottom 20px] at (1) should be [50% calc(-20px + 100%)]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [center center] to [right 20px bottom 20px] at (0) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center center] to [right 20px bottom 20px] at (0.25) should be [calc(-5px + 62.5%) calc(-5px + 62.5%)]PASS
CSS Transitions: property <background-position> from [center center] to [right 20px bottom 20px] at (0.5) should be [calc(-10px + 75%) calc(-10px + 75%)]PASS
CSS Transitions: property <background-position> from [center center] to [right 20px bottom 20px] at (0.75) should be [calc(-15px + 87.5%) calc(-15px + 87.5%)]PASS
CSS Transitions: property <background-position> from [center center] to [right 20px bottom 20px] at (1) should be [calc(-20px + 100%) calc(-20px + 100%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px bottom 20px] at (0) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px bottom 20px] at (0.25) should be [calc(-5px + 62.5%) calc(-5px + 62.5%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px bottom 20px] at (0.5) should be [calc(-10px + 75%) calc(-10px + 75%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px bottom 20px] at (0.75) should be [calc(-15px + 87.5%) calc(-15px + 87.5%)]PASS
CSS Transitions with transition: all: property <background-position> from [center center] to [right 20px bottom 20px] at (1) should be [calc(-20px + 100%) calc(-20px + 100%)]PASS
CSS Animations: property <background-position> from [center center] to [right 20px bottom 20px] at (0) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center center] to [right 20px bottom 20px] at (0.25) should be [calc(-5px + 62.5%) calc(-5px + 62.5%)]PASS
CSS Animations: property <background-position> from [center center] to [right 20px bottom 20px] at (0.5) should be [calc(-10px + 75%) calc(-10px + 75%)]PASS
CSS Animations: property <background-position> from [center center] to [right 20px bottom 20px] at (0.75) should be [calc(-15px + 87.5%) calc(-15px + 87.5%)]PASS
CSS Animations: property <background-position> from [center center] to [right 20px bottom 20px] at (1) should be [calc(-20px + 100%) calc(-20px + 100%)]PASS
Web Animations: property <background-position> from [center center] to [right 20px bottom 20px] at (0) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [right 20px bottom 20px] at (0.25) should be [calc(-5px + 62.5%) calc(-5px + 62.5%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [right 20px bottom 20px] at (0.5) should be [calc(-10px + 75%) calc(-10px + 75%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [right 20px bottom 20px] at (0.75) should be [calc(-15px + 87.5%) calc(-15px + 87.5%)]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center center] to [right 20px bottom 20px] at (1) should be [calc(-20px + 100%) calc(-20px + 100%)]FAILassert_true: Web Animations should be supported expected true got false
CSS Transitions: property <background-position> from [center] to [bottom] at (0) should be [50% 50%]PASS
CSS Transitions: property <background-position> from [center] to [bottom] at (0.25) should be [50% 62.5%]PASS
CSS Transitions: property <background-position> from [center] to [bottom] at (0.5) should be [50% 75%]PASS
CSS Transitions: property <background-position> from [center] to [bottom] at (0.75) should be [50% 87.5%]PASS
CSS Transitions: property <background-position> from [center] to [bottom] at (1) should be [50% 100%]PASS
CSS Transitions with transition: all: property <background-position> from [center] to [bottom] at (0) should be [50% 50%]PASS
CSS Transitions with transition: all: property <background-position> from [center] to [bottom] at (0.25) should be [50% 62.5%]PASS
CSS Transitions with transition: all: property <background-position> from [center] to [bottom] at (0.5) should be [50% 75%]PASS
CSS Transitions with transition: all: property <background-position> from [center] to [bottom] at (0.75) should be [50% 87.5%]PASS
CSS Transitions with transition: all: property <background-position> from [center] to [bottom] at (1) should be [50% 100%]PASS
CSS Animations: property <background-position> from [center] to [bottom] at (0) should be [50% 50%]PASS
CSS Animations: property <background-position> from [center] to [bottom] at (0.25) should be [50% 62.5%]PASS
CSS Animations: property <background-position> from [center] to [bottom] at (0.5) should be [50% 75%]PASS
CSS Animations: property <background-position> from [center] to [bottom] at (0.75) should be [50% 87.5%]PASS
CSS Animations: property <background-position> from [center] to [bottom] at (1) should be [50% 100%]PASS
Web Animations: property <background-position> from [center] to [bottom] at (0) should be [50% 50%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center] to [bottom] at (0.25) should be [50% 62.5%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center] to [bottom] at (0.5) should be [50% 75%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center] to [bottom] at (0.75) should be [50% 87.5%]FAILassert_true: Web Animations should be supported expected true got false
Web Animations: property <background-position> from [center] to [bottom] at (1) should be [50% 100%]FAILassert_true: Web Animations should be supported expected true got false

/css/css-backgrounds/animations/background-position-origin-interpolation.html

<!doctype html>
<meta charset="utf-8">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#background-position">
<meta name="test" content="background-position animation handles origin parameters">

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

<style>
.parent {
  background-position: 80px 80px;
}
.target {
  border: 3px solid skyblue;
  width: 100px;
  height: 100px;
  background-image: linear-gradient(to right, green, green);
  background-size: 20px 20px;
  background-repeat: no-repeat;
  background-position: 10px 10px;
  display: inline-block;
}

.actual {
  background-image: linear-gradient(to right, red, red);
}
.expected {
  margin-left: -106px;
}
</style>

<body></body>

<script>
// neutral
test_interpolation({
  property: 'background-position',
  from: neutralKeyframe,
  to: 'left 20px top 20px',
}, [
  {at: 0, expect: '10px 10px'},
  {at: 0.25, expect: '12.5px 12.5px'},
  {at: 0.5, expect: '15px 15px'},
  {at: 0.75, expect: '17.5px 17.5px'},
  {at: 1, expect: '20px 20px'},
]);

// initial
test_interpolation({
  property: 'background-position',
  from: 'initial',
  to: 'left 20px top 20px',
}, [
  {at: 0, expect: '0% 0%'},
  {at: 0.25, expect: 'calc(0% + 5px) calc(0% + 5px)'},
  {at: 0.5, expect: 'calc(0% + 10px) calc(0% + 10px)'},
  {at: 0.75, expect: 'calc(0% + 15px) calc(0% + 15px)'},
  {at: 1, expect: 'calc(0% + 20px) calc(0% + 20px)'},
]);

// inherit
test_interpolation({
  property: 'background-position',
  from: 'inherit',
  to: 'left 20px top 20px',
}, [
  {at: 0, expect: '80px 80px'},
  {at: 0.25, expect: '65px 65px'},
  {at: 0.5, expect: '50px 50px'},
  {at: 0.75, expect: '35px 35px'},
  {at: 1, expect: '20px 20px'},
]);

// unset
test_interpolation({
  property: 'background-position',
  from: 'unset',
  to: 'left 20px top 20px',
}, [
  {at: 0, expect: '0% 0%'},
  {at: 0.25, expect: 'calc(0% + 5px) calc(0% + 5px)'},
  {at: 0.5, expect: 'calc(0% + 10px) calc(0% + 10px)'},
  {at: 0.75, expect: 'calc(0% + 15px) calc(0% + 15px)'},
  {at: 1, expect: 'calc(0% + 20px) calc(0% + 20px)'},
]);

// left-top
test_interpolation({
  property: 'background-position',
  from: 'center center',
  to: 'left 20px top 20px',
}, [
  {at: 0, expect: '50% 50%'},
  {at: 0.25, expect: 'calc(5px + 37.5%) calc(5px + 37.5%)'},
  {at: 0.5, expect: 'calc(10px + 25%) calc(10px + 25%)'},
  {at: 0.75, expect: 'calc(15px + 12.5%) calc(15px + 12.5%)'},
  {at: 1, expect: 'calc(0% + 20px) calc(0% + 20px)'},
]);

// center-top
test_interpolation({
  property: 'background-position',
  from: 'center center',
  to: 'center top 20px',
}, [
  {at: 0, expect: '50% 50%'},
  {at: 0.25, expect: '50% calc(5px + 37.5%)'},
  {at: 0.5, expect: '50% calc(10px + 25%)'},
  {at: 0.75, expect: '50% calc(15px + 12.5%)'},
  {at: 1, expect: '50% calc(0% + 20px)'},
]);

// right-top
test_interpolation({
  property: 'background-position',
  from: 'center center',
  to: 'right 20px top 20px',
}, [
  {at: 0, expect: '50% 50%'},
  {at: 0.25, expect: 'calc(-5px + 62.5%) calc(5px + 37.5%)'},
  {at: 0.5, expect: 'calc(-10px + 75%) calc(10px + 25%)'},
  {at: 0.75, expect: 'calc(-15px + 87.5%) calc(15px + 12.5%)'},
  {at: 1, expect: 'calc(-20px + 100%) calc(0% + 20px)'},
]);

// left-center
test_interpolation({
  property: 'background-position',
  from: 'center center',
  to: 'left 20px center',
}, [
  {at: 0, expect: '50% 50%'},
  {at: 0.25, expect: 'calc(5px + 37.5%) 50%'},
  {at: 0.5, expect: 'calc(10px + 25%) 50%'},
  {at: 0.75, expect: 'calc(15px + 12.5%) 50%'},
  {at: 1, expect: 'calc(0% + 20px) 50%'},
]);

// center-center
test_interpolation({
  property: 'background-position',
  from: 'center center',
  to: 'center center',
}, [
  {at: 0, expect: '50% 50%'},
  {at: 0.25, expect: '50% 50%'},
  {at: 0.5, expect: '50% 50%'},
  {at: 0.75, expect: '50% 50%'},
  {at: 1, expect: '50% 50%'},
]);

// right-center
test_interpolation({
  property: 'background-position',
  from: 'center center',
  to: 'right 20px center',
}, [
  {at: 0, expect: '50% 50%'},
  {at: 0.25, expect: 'calc(-5px + 62.5%) 50%'},
  {at: 0.5, expect: 'calc(-10px + 75%) 50%'},
  {at: 0.75, expect: 'calc(-15px + 87.5%) 50%'},
  {at: 1, expect: 'calc(-20px + 100%) 50%'},
]);

// left-bottom
test_interpolation({
  property: 'background-position',
  from: 'center center',
  to: 'left 20px bottom 20px',
}, [
  {at: 0, expect: '50% 50%'},
  {at: 0.25, expect: 'calc(5px + 37.5%) calc(-5px + 62.5%)'},
  {at: 0.5, expect: 'calc(10px + 25%) calc(-10px + 75%)'},
  {at: 0.75, expect: 'calc(15px + 12.5%) calc(-15px + 87.5%)'},
  {at: 1, expect: 'calc(0% + 20px) calc(-20px + 100%)'},
]);

// center-bottom
test_interpolation({
  property: 'background-position',
  from: 'center center',
  to: 'center bottom 20px',
}, [
  {at: 0, expect: '50% 50%'},
  {at: 0.25, expect: '50% calc(-5px + 62.5%)'},
  {at: 0.5, expect: '50% calc(-10px + 75%)'},
  {at: 0.75, expect: '50% calc(-15px + 87.5%)'},
  {at: 1, expect: '50% calc(-20px + 100%)'},
]);

// right-bottom
test_interpolation({
  property: 'background-position',
  from: 'center center',
  to: 'right 20px bottom 20px',
}, [
  {at: 0, expect: '50% 50%'},
  {at: 0.25, expect: 'calc(-5px + 62.5%) calc(-5px + 62.5%)'},
  {at: 0.5, expect: 'calc(-10px + 75%) calc(-10px + 75%)'},
  {at: 0.75, expect: 'calc(-15px + 87.5%) calc(-15px + 87.5%)'},
  {at: 1, expect: 'calc(-20px + 100%) calc(-20px + 100%)'},
]);

// Single values
test_interpolation({
  property: 'background-position',
  from: 'center',
  to: 'bottom',
}, [
  {at: 0, expect: '50% 50%'},
  {at: 0.25, expect: '50% 62.5%'},
  {at: 0.5, expect: '50% 75%'},
  {at: 0.75, expect: '50% 87.5%'},
  {at: 1, expect: '50% 100%'},
]);
</script>