Handle more <length> properties in animation

LayoutTests/animations/interpolation/svg-cy-interpolation-expected.txt

Index: LayoutTests/animations/interpolation/svg-cy-interpolation-expected.txt
diff --git a/LayoutTests/animations/interpolation/svg-cy-interpolation-expected.txt b/LayoutTests/animations/interpolation/svg-cy-interpolation-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bd2ea3a78b76c26cdd9f8eb6dcce87edff3e1bf7
--- /dev/null
+++ b/LayoutTests/animations/interpolation/svg-cy-interpolation-expected.txt
@@ -0,0 +1,60 @@
+CSS Animations:
+PASS: cy from [-10px] to [10px] was [-15px] at -0.25
+PASS: cy from [-10px] to [10px] was [-10px] at 0
+PASS: cy from [-10px] to [10px] was [-5px] at 0.25
+PASS: cy from [-10px] to [10px] was [0px] at 0.5
+PASS: cy from [-10px] to [10px] was [5px] at 0.75
+PASS: cy from [-10px] to [10px] was [10px] at 1
+PASS: cy from [-10px] to [10px] was [15px] at 1.25
+PASS: cy from [-20px] to [30em] was [-145px] at -0.25
+PASS: cy from [-20px] to [30em] was [-20px] at 0
+PASS: cy from [-20px] to [30em] was [105px] at 0.25
+PASS: cy from [-20px] to [30em] was [230px] at 0.5
+PASS: cy from [-20px] to [30em] was [355px] at 0.75
+PASS: cy from [-20px] to [30em] was [30em] at 1
+PASS: cy from [-20px] to [30em] was [605px] at 1.25
+PASS: cy from [inherit] to [140px] was [90px] at -0.25
+PASS: cy from [inherit] to [140px] was [100px] at 0
+PASS: cy from [inherit] to [140px] was [110px] at 0.25
+PASS: cy from [inherit] to [140px] was [120px] at 0.5
+PASS: cy from [inherit] to [140px] was [130px] at 0.75
+PASS: cy from [inherit] to [140px] was [140px] at 1
+PASS: cy from [inherit] to [140px] was [150px] at 1.25
+PASS: cy from [-10] to [10] was [-15] at -0.25
+PASS: cy from [-10] to [10] was [-10] at 0
+PASS: cy from [-10] to [10] was [-5] at 0.25
+PASS: cy from [-10] to [10] was [0] at 0.5
+PASS: cy from [-10] to [10] was [5] at 0.75
+PASS: cy from [-10] to [10] was [10] at 1
+PASS: cy from [-10] to [10] was [15] at 1.25
+
+Web Animations API:
+PASS: cy from [-10px] to [10px] was [-15px] at -0.25
+PASS: cy from [-10px] to [10px] was [-10px] at 0
+PASS: cy from [-10px] to [10px] was [-5px] at 0.25
+PASS: cy from [-10px] to [10px] was [0px] at 0.5
+PASS: cy from [-10px] to [10px] was [5px] at 0.75
+PASS: cy from [-10px] to [10px] was [10px] at 1
+PASS: cy from [-10px] to [10px] was [15px] at 1.25
+PASS: cy from [-20px] to [30em] was [-145px] at -0.25
+PASS: cy from [-20px] to [30em] was [-20px] at 0
+PASS: cy from [-20px] to [30em] was [105px] at 0.25
+PASS: cy from [-20px] to [30em] was [230px] at 0.5
+PASS: cy from [-20px] to [30em] was [355px] at 0.75
+PASS: cy from [-20px] to [30em] was [30em] at 1
+PASS: cy from [-20px] to [30em] was [605px] at 1.25
+PASS: cy from [inherit] to [140px] was [90px] at -0.25
+PASS: cy from [inherit] to [140px] was [100px] at 0
+PASS: cy from [inherit] to [140px] was [110px] at 0.25
+PASS: cy from [inherit] to [140px] was [120px] at 0.5
+PASS: cy from [inherit] to [140px] was [130px] at 0.75
+PASS: cy from [inherit] to [140px] was [140px] at 1
+PASS: cy from [inherit] to [140px] was [150px] at 1.25
+PASS: cy from [-10] to [10] was [-15] at -0.25
+PASS: cy from [-10] to [10] was [-10] at 0
+PASS: cy from [-10] to [10] was [-5] at 0.25
+PASS: cy from [-10] to [10] was [0] at 0.5
+PASS: cy from [-10] to [10] was [5] at 0.75
+PASS: cy from [-10] to [10] was [10] at 1
+PASS: cy from [-10] to [10] was [15] at 1.25
+