[background-position-x-interpolation.html]
  [Web Animations: property <background-position-x> from [inherit\] to [80px\] at (0.75) should be [75px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [inherit\] to [80px\] at (-0.25) should be [55px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from neutral to [80px\] at (0.25) should be [50px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [inherit\] to [80px\] at (0.5) should be [70px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [300px, 400px\] to [500px, 600px, 700px\] at (1.25) should be [550px, 650px, 800px, 525px, 675px, 775px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [300px, 400px\] to [500px, 600px, 700px\] at (1) should be [500px, 600px, 700px, 500px, 600px, 700px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [300px, 400px\] to [500px, 600px, 700px\] at (0.75) should be [450px, 550px, 600px, 475px, 525px, 625px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from neutral to [80px\] at (1) should be [80px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [inherit\] to [80px\] at (1) should be [80px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [initial\] to [right\] at (0.5) should be [50%\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from neutral to [80px\] at (0) should be [40px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [initial\] to [right\] at (1) should be [100%\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from neutral to [80px\] at (1.25) should be [90px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [300px, 400px\] to [500px, 600px, 700px\] at (-0.25) should be [250px, 350px, 200px, 375px, 225px, 325px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [300px, 400px\] to [500px, 600px, 700px\] at (0.5) should be [400px, 500px, 500px, 450px, 450px, 550px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [initial\] to [right\] at (0) should be [0%\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [initial\] to [right\] at (1.25) should be [125%\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from neutral to [80px\] at (-0.25) should be [30px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [initial\] to [right\] at (0.25) should be [25%\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from neutral to [80px\] at (0.5) should be [60px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [300px, 400px\] to [500px, 600px, 700px\] at (0) should be [300px, 400px, 300px, 400px, 300px, 400px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [inherit\] to [80px\] at (0) should be [60px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [300px, 400px\] to [500px, 600px, 700px\] at (0.25) should be [350px, 450px, 400px, 425px, 375px, 475px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [inherit\] to [80px\] at (1.25) should be [85px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [initial\] to [right\] at (-0.25) should be [-25%\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [initial\] to [right\] at (0.75) should be [75%\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from neutral to [80px\] at (0.75) should be [70px\]]
    expected: FAIL

  [Web Animations: property <background-position-x> from [inherit\] to [80px\] at (0.25) should be [65px\]]
    expected: FAIL