From 4f4b43f1d2e8235e35ebe8ed313cc68c340b9c19 Mon Sep 17 00:00:00 2001
From: Andreas Kling <andreas@ladybird.org>
Date: Fri, 25 Apr 2025 12:39:33 +0200
Subject: [PATCH] Tests: Import WPT test for CSS scale interpolation

---
 .../animation/scale-interpolation.txt         | 366 ++++++++++++++++++
 .../animation/scale-interpolation.html        | 242 ++++++++++++
 2 files changed, 608 insertions(+)
 create mode 100644 Tests/LibWeb/Text/expected/wpt-import/css/css-transforms/animation/scale-interpolation.txt
 create mode 100644 Tests/LibWeb/Text/input/wpt-import/css/css-transforms/animation/scale-interpolation.html

diff --git a/Tests/LibWeb/Text/expected/wpt-import/css/css-transforms/animation/scale-interpolation.txt b/Tests/LibWeb/Text/expected/wpt-import/css/css-transforms/animation/scale-interpolation.txt
new file mode 100644
index 00000000000..0e86db41211
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/wpt-import/css/css-transforms/animation/scale-interpolation.txt
@@ -0,0 +1,366 @@
+Harness status: OK
+
+Found 360 tests
+
+40 Pass
+320 Fail
+Fail	CSS Transitions: property <scale> from [-10 5] to [10 -5] at (-1) should be [-30 15]
+Pass	CSS Transitions: property <scale> from [-10 5] to [10 -5] at (0) should be [-10 5]
+Fail	CSS Transitions: property <scale> from [-10 5] to [10 -5] at (0.25) should be [-5 2.5]
+Fail	CSS Transitions: property <scale> from [-10 5] to [10 -5] at (0.75) should be [5 -2.5]
+Pass	CSS Transitions: property <scale> from [-10 5] to [10 -5] at (1) should be [10 -5]
+Fail	CSS Transitions: property <scale> from [-10 5] to [10 -5] at (2) should be [30 -15]
+Fail	CSS Transitions with transition: all: property <scale> from [-10 5] to [10 -5] at (-1) should be [-30 15]
+Fail	CSS Transitions with transition: all: property <scale> from [-10 5] to [10 -5] at (0) should be [-10 5]
+Fail	CSS Transitions with transition: all: property <scale> from [-10 5] to [10 -5] at (0.25) should be [-5 2.5]
+Fail	CSS Transitions with transition: all: property <scale> from [-10 5] to [10 -5] at (0.75) should be [5 -2.5]
+Pass	CSS Transitions with transition: all: property <scale> from [-10 5] to [10 -5] at (1) should be [10 -5]
+Fail	CSS Transitions with transition: all: property <scale> from [-10 5] to [10 -5] at (2) should be [30 -15]
+Fail	CSS Animations: property <scale> from [-10 5] to [10 -5] at (-1) should be [-30 15]
+Pass	CSS Animations: property <scale> from [-10 5] to [10 -5] at (0) should be [-10 5]
+Fail	CSS Animations: property <scale> from [-10 5] to [10 -5] at (0.25) should be [-5 2.5]
+Fail	CSS Animations: property <scale> from [-10 5] to [10 -5] at (0.75) should be [5 -2.5]
+Pass	CSS Animations: property <scale> from [-10 5] to [10 -5] at (1) should be [10 -5]
+Fail	CSS Animations: property <scale> from [-10 5] to [10 -5] at (2) should be [30 -15]
+Fail	Web Animations: property <scale> from [-10 5] to [10 -5] at (-1) should be [-30 15]
+Pass	Web Animations: property <scale> from [-10 5] to [10 -5] at (0) should be [-10 5]
+Fail	Web Animations: property <scale> from [-10 5] to [10 -5] at (0.25) should be [-5 2.5]
+Fail	Web Animations: property <scale> from [-10 5] to [10 -5] at (0.75) should be [5 -2.5]
+Pass	Web Animations: property <scale> from [-10 5] to [10 -5] at (1) should be [10 -5]
+Fail	Web Animations: property <scale> from [-10 5] to [10 -5] at (2) should be [30 -15]
+Fail	CSS Transitions: property <scale> from [2 30 400] to [10 110 1200] at (-1) should be [-6 -50 -400]
+Fail	CSS Transitions: property <scale> from [2 30 400] to [10 110 1200] at (0) should be [2 30 400]
+Fail	CSS Transitions: property <scale> from [2 30 400] to [10 110 1200] at (0.125) should be [3 40 500]
+Fail	CSS Transitions: property <scale> from [2 30 400] to [10 110 1200] at (0.875) should be [9 100 1100]
+Fail	CSS Transitions: property <scale> from [2 30 400] to [10 110 1200] at (1) should be [10 110 1200]
+Fail	CSS Transitions: property <scale> from [2 30 400] to [10 110 1200] at (2) should be [18 190 2000]
+Fail	CSS Transitions with transition: all: property <scale> from [2 30 400] to [10 110 1200] at (-1) should be [-6 -50 -400]
+Fail	CSS Transitions with transition: all: property <scale> from [2 30 400] to [10 110 1200] at (0) should be [2 30 400]
+Fail	CSS Transitions with transition: all: property <scale> from [2 30 400] to [10 110 1200] at (0.125) should be [3 40 500]
+Fail	CSS Transitions with transition: all: property <scale> from [2 30 400] to [10 110 1200] at (0.875) should be [9 100 1100]
+Fail	CSS Transitions with transition: all: property <scale> from [2 30 400] to [10 110 1200] at (1) should be [10 110 1200]
+Fail	CSS Transitions with transition: all: property <scale> from [2 30 400] to [10 110 1200] at (2) should be [18 190 2000]
+Fail	CSS Animations: property <scale> from [2 30 400] to [10 110 1200] at (-1) should be [-6 -50 -400]
+Fail	CSS Animations: property <scale> from [2 30 400] to [10 110 1200] at (0) should be [2 30 400]
+Fail	CSS Animations: property <scale> from [2 30 400] to [10 110 1200] at (0.125) should be [3 40 500]
+Fail	CSS Animations: property <scale> from [2 30 400] to [10 110 1200] at (0.875) should be [9 100 1100]
+Fail	CSS Animations: property <scale> from [2 30 400] to [10 110 1200] at (1) should be [10 110 1200]
+Fail	CSS Animations: property <scale> from [2 30 400] to [10 110 1200] at (2) should be [18 190 2000]
+Fail	Web Animations: property <scale> from [2 30 400] to [10 110 1200] at (-1) should be [-6 -50 -400]
+Fail	Web Animations: property <scale> from [2 30 400] to [10 110 1200] at (0) should be [2 30 400]
+Fail	Web Animations: property <scale> from [2 30 400] to [10 110 1200] at (0.125) should be [3 40 500]
+Fail	Web Animations: property <scale> from [2 30 400] to [10 110 1200] at (0.875) should be [9 100 1100]
+Fail	Web Animations: property <scale> from [2 30 400] to [10 110 1200] at (1) should be [10 110 1200]
+Fail	Web Animations: property <scale> from [2 30 400] to [10 110 1200] at (2) should be [18 190 2000]
+Fail	CSS Transitions: property <scale> from [26 17 9] to [2 1] at (-1) should be [50 33 17]
+Fail	CSS Transitions: property <scale> from [26 17 9] to [2 1] at (0) should be [26 17 9]
+Fail	CSS Transitions: property <scale> from [26 17 9] to [2 1] at (0.125) should be [23 15 8]
+Fail	CSS Transitions: property <scale> from [26 17 9] to [2 1] at (0.875) should be [5 3 2]
+Fail	CSS Transitions: property <scale> from [26 17 9] to [2 1] at (1) should be [2 1]
+Fail	CSS Transitions: property <scale> from [26 17 9] to [2 1] at (2) should be [-22 -15 -7]
+Fail	CSS Transitions with transition: all: property <scale> from [26 17 9] to [2 1] at (-1) should be [50 33 17]
+Fail	CSS Transitions with transition: all: property <scale> from [26 17 9] to [2 1] at (0) should be [26 17 9]
+Fail	CSS Transitions with transition: all: property <scale> from [26 17 9] to [2 1] at (0.125) should be [23 15 8]
+Fail	CSS Transitions with transition: all: property <scale> from [26 17 9] to [2 1] at (0.875) should be [5 3 2]
+Fail	CSS Transitions with transition: all: property <scale> from [26 17 9] to [2 1] at (1) should be [2 1]
+Fail	CSS Transitions with transition: all: property <scale> from [26 17 9] to [2 1] at (2) should be [-22 -15 -7]
+Fail	CSS Animations: property <scale> from [26 17 9] to [2 1] at (-1) should be [50 33 17]
+Fail	CSS Animations: property <scale> from [26 17 9] to [2 1] at (0) should be [26 17 9]
+Fail	CSS Animations: property <scale> from [26 17 9] to [2 1] at (0.125) should be [23 15 8]
+Fail	CSS Animations: property <scale> from [26 17 9] to [2 1] at (0.875) should be [5 3 2]
+Fail	CSS Animations: property <scale> from [26 17 9] to [2 1] at (1) should be [2 1]
+Fail	CSS Animations: property <scale> from [26 17 9] to [2 1] at (2) should be [-22 -15 -7]
+Fail	Web Animations: property <scale> from [26 17 9] to [2 1] at (-1) should be [50 33 17]
+Fail	Web Animations: property <scale> from [26 17 9] to [2 1] at (0) should be [26 17 9]
+Fail	Web Animations: property <scale> from [26 17 9] to [2 1] at (0.125) should be [23 15 8]
+Fail	Web Animations: property <scale> from [26 17 9] to [2 1] at (0.875) should be [5 3 2]
+Fail	Web Animations: property <scale> from [26 17 9] to [2 1] at (1) should be [2 1]
+Fail	Web Animations: property <scale> from [26 17 9] to [2 1] at (2) should be [-22 -15 -7]
+Fail	CSS Transitions: property <scale> from [1] to [10 -5 0] at (-1) should be [-8 7 2]
+Fail	CSS Transitions: property <scale> from [1] to [10 -5 0] at (0) should be [1]
+Fail	CSS Transitions: property <scale> from [1] to [10 -5 0] at (0.25) should be [3.25 -0.5 0.75]
+Fail	CSS Transitions: property <scale> from [1] to [10 -5 0] at (0.75) should be [7.75 -3.5 0.25]
+Fail	CSS Transitions: property <scale> from [1] to [10 -5 0] at (1) should be [10 -5 0]
+Fail	CSS Transitions: property <scale> from [1] to [10 -5 0] at (2) should be [19 -11 -1]
+Fail	CSS Transitions with transition: all: property <scale> from [1] to [10 -5 0] at (-1) should be [-8 7 2]
+Fail	CSS Transitions with transition: all: property <scale> from [1] to [10 -5 0] at (0) should be [1]
+Fail	CSS Transitions with transition: all: property <scale> from [1] to [10 -5 0] at (0.25) should be [3.25 -0.5 0.75]
+Fail	CSS Transitions with transition: all: property <scale> from [1] to [10 -5 0] at (0.75) should be [7.75 -3.5 0.25]
+Fail	CSS Transitions with transition: all: property <scale> from [1] to [10 -5 0] at (1) should be [10 -5 0]
+Fail	CSS Transitions with transition: all: property <scale> from [1] to [10 -5 0] at (2) should be [19 -11 -1]
+Fail	CSS Animations: property <scale> from [1] to [10 -5 0] at (-1) should be [-8 7 2]
+Fail	CSS Animations: property <scale> from [1] to [10 -5 0] at (0) should be [1]
+Fail	CSS Animations: property <scale> from [1] to [10 -5 0] at (0.25) should be [3.25 -0.5 0.75]
+Fail	CSS Animations: property <scale> from [1] to [10 -5 0] at (0.75) should be [7.75 -3.5 0.25]
+Fail	CSS Animations: property <scale> from [1] to [10 -5 0] at (1) should be [10 -5 0]
+Fail	CSS Animations: property <scale> from [1] to [10 -5 0] at (2) should be [19 -11 -1]
+Fail	Web Animations: property <scale> from [1] to [10 -5 0] at (-1) should be [-8 7 2]
+Fail	Web Animations: property <scale> from [1] to [10 -5 0] at (0) should be [1]
+Fail	Web Animations: property <scale> from [1] to [10 -5 0] at (0.25) should be [3.25 -0.5 0.75]
+Fail	Web Animations: property <scale> from [1] to [10 -5 0] at (0.75) should be [7.75 -3.5 0.25]
+Fail	Web Animations: property <scale> from [1] to [10 -5 0] at (1) should be [10 -5 0]
+Fail	Web Animations: property <scale> from [1] to [10 -5 0] at (2) should be [19 -11 -1]
+Fail	CSS Transitions: property <scale> from [-10 5 1] to [1] at (-1) should be [-21 9]
+Fail	CSS Transitions: property <scale> from [-10 5 1] to [1] at (0) should be [-10 5]
+Fail	CSS Transitions: property <scale> from [-10 5 1] to [1] at (0.25) should be [-7.25 4]
+Fail	CSS Transitions: property <scale> from [-10 5 1] to [1] at (0.75) should be [-1.75 2]
+Fail	CSS Transitions: property <scale> from [-10 5 1] to [1] at (1) should be [1]
+Fail	CSS Transitions: property <scale> from [-10 5 1] to [1] at (2) should be [12 -3]
+Fail	CSS Transitions with transition: all: property <scale> from [-10 5 1] to [1] at (-1) should be [-21 9]
+Fail	CSS Transitions with transition: all: property <scale> from [-10 5 1] to [1] at (0) should be [-10 5]
+Fail	CSS Transitions with transition: all: property <scale> from [-10 5 1] to [1] at (0.25) should be [-7.25 4]
+Fail	CSS Transitions with transition: all: property <scale> from [-10 5 1] to [1] at (0.75) should be [-1.75 2]
+Fail	CSS Transitions with transition: all: property <scale> from [-10 5 1] to [1] at (1) should be [1]
+Fail	CSS Transitions with transition: all: property <scale> from [-10 5 1] to [1] at (2) should be [12 -3]
+Fail	CSS Animations: property <scale> from [-10 5 1] to [1] at (-1) should be [-21 9]
+Fail	CSS Animations: property <scale> from [-10 5 1] to [1] at (0) should be [-10 5]
+Fail	CSS Animations: property <scale> from [-10 5 1] to [1] at (0.25) should be [-7.25 4]
+Fail	CSS Animations: property <scale> from [-10 5 1] to [1] at (0.75) should be [-1.75 2]
+Fail	CSS Animations: property <scale> from [-10 5 1] to [1] at (1) should be [1]
+Fail	CSS Animations: property <scale> from [-10 5 1] to [1] at (2) should be [12 -3]
+Fail	Web Animations: property <scale> from [-10 5 1] to [1] at (-1) should be [-21 9]
+Fail	Web Animations: property <scale> from [-10 5 1] to [1] at (0) should be [-10 5]
+Fail	Web Animations: property <scale> from [-10 5 1] to [1] at (0.25) should be [-7.25 4]
+Fail	Web Animations: property <scale> from [-10 5 1] to [1] at (0.75) should be [-1.75 2]
+Fail	Web Animations: property <scale> from [-10 5 1] to [1] at (1) should be [1]
+Fail	Web Animations: property <scale> from [-10 5 1] to [1] at (2) should be [12 -3]
+Pass	CSS Transitions: property <scale> from [none] to [none] at (-1) should be [none]
+Pass	CSS Transitions: property <scale> from [none] to [none] at (0) should be [none]
+Pass	CSS Transitions: property <scale> from [none] to [none] at (0.125) should be [none]
+Pass	CSS Transitions: property <scale> from [none] to [none] at (0.875) should be [none]
+Pass	CSS Transitions: property <scale> from [none] to [none] at (1) should be [none]
+Pass	CSS Transitions: property <scale> from [none] to [none] at (2) should be [none]
+Pass	CSS Transitions with transition: all: property <scale> from [none] to [none] at (-1) should be [none]
+Pass	CSS Transitions with transition: all: property <scale> from [none] to [none] at (0) should be [none]
+Pass	CSS Transitions with transition: all: property <scale> from [none] to [none] at (0.125) should be [none]
+Pass	CSS Transitions with transition: all: property <scale> from [none] to [none] at (0.875) should be [none]
+Pass	CSS Transitions with transition: all: property <scale> from [none] to [none] at (1) should be [none]
+Pass	CSS Transitions with transition: all: property <scale> from [none] to [none] at (2) should be [none]
+Pass	CSS Animations: property <scale> from [none] to [none] at (-1) should be [none]
+Pass	CSS Animations: property <scale> from [none] to [none] at (0) should be [none]
+Pass	CSS Animations: property <scale> from [none] to [none] at (0.125) should be [none]
+Pass	CSS Animations: property <scale> from [none] to [none] at (0.875) should be [none]
+Pass	CSS Animations: property <scale> from [none] to [none] at (1) should be [none]
+Pass	CSS Animations: property <scale> from [none] to [none] at (2) should be [none]
+Pass	Web Animations: property <scale> from [none] to [none] at (-1) should be [none]
+Pass	Web Animations: property <scale> from [none] to [none] at (0) should be [none]
+Pass	Web Animations: property <scale> from [none] to [none] at (0.125) should be [none]
+Pass	Web Animations: property <scale> from [none] to [none] at (0.875) should be [none]
+Pass	Web Animations: property <scale> from [none] to [none] at (1) should be [none]
+Pass	Web Animations: property <scale> from [none] to [none] at (2) should be [none]
+Fail	CSS Transitions: property <scale> from [none] to [4 3 2] at (-1) should be [-2 -1 0]
+Fail	CSS Transitions: property <scale> from [none] to [4 3 2] at (0) should be [1]
+Fail	CSS Transitions: property <scale> from [none] to [4 3 2] at (0.125) should be [1.375 1.25 1.125]
+Fail	CSS Transitions: property <scale> from [none] to [4 3 2] at (0.875) should be [3.625 2.75 1.875]
+Fail	CSS Transitions: property <scale> from [none] to [4 3 2] at (1) should be [4 3 2]
+Fail	CSS Transitions: property <scale> from [none] to [4 3 2] at (2) should be [7 5 3]
+Fail	CSS Transitions with transition: all: property <scale> from [none] to [4 3 2] at (-1) should be [-2 -1 0]
+Fail	CSS Transitions with transition: all: property <scale> from [none] to [4 3 2] at (0) should be [1]
+Fail	CSS Transitions with transition: all: property <scale> from [none] to [4 3 2] at (0.125) should be [1.375 1.25 1.125]
+Fail	CSS Transitions with transition: all: property <scale> from [none] to [4 3 2] at (0.875) should be [3.625 2.75 1.875]
+Fail	CSS Transitions with transition: all: property <scale> from [none] to [4 3 2] at (1) should be [4 3 2]
+Fail	CSS Transitions with transition: all: property <scale> from [none] to [4 3 2] at (2) should be [7 5 3]
+Fail	CSS Animations: property <scale> from [none] to [4 3 2] at (-1) should be [-2 -1 0]
+Fail	CSS Animations: property <scale> from [none] to [4 3 2] at (0) should be [1]
+Fail	CSS Animations: property <scale> from [none] to [4 3 2] at (0.125) should be [1.375 1.25 1.125]
+Fail	CSS Animations: property <scale> from [none] to [4 3 2] at (0.875) should be [3.625 2.75 1.875]
+Fail	CSS Animations: property <scale> from [none] to [4 3 2] at (1) should be [4 3 2]
+Fail	CSS Animations: property <scale> from [none] to [4 3 2] at (2) should be [7 5 3]
+Fail	Web Animations: property <scale> from [none] to [4 3 2] at (-1) should be [-2 -1 0]
+Fail	Web Animations: property <scale> from [none] to [4 3 2] at (0) should be [1]
+Fail	Web Animations: property <scale> from [none] to [4 3 2] at (0.125) should be [1.375 1.25 1.125]
+Fail	Web Animations: property <scale> from [none] to [4 3 2] at (0.875) should be [3.625 2.75 1.875]
+Fail	Web Animations: property <scale> from [none] to [4 3 2] at (1) should be [4 3 2]
+Fail	Web Animations: property <scale> from [none] to [4 3 2] at (2) should be [7 5 3]
+Fail	CSS Transitions: property <scale> from neutral to [1.5 1] at (-1) should be [0.7 1]
+Pass	CSS Transitions: property <scale> from neutral to [1.5 1] at (0) should be [1.1 1]
+Fail	CSS Transitions: property <scale> from neutral to [1.5 1] at (0.25) should be [1.2 1]
+Fail	CSS Transitions: property <scale> from neutral to [1.5 1] at (0.75) should be [1.4 1]
+Pass	CSS Transitions: property <scale> from neutral to [1.5 1] at (1) should be [1.5 1]
+Fail	CSS Transitions: property <scale> from neutral to [1.5 1] at (2) should be [1.9 1]
+Fail	CSS Transitions with transition: all: property <scale> from neutral to [1.5 1] at (-1) should be [0.7 1]
+Fail	CSS Transitions with transition: all: property <scale> from neutral to [1.5 1] at (0) should be [1.1 1]
+Fail	CSS Transitions with transition: all: property <scale> from neutral to [1.5 1] at (0.25) should be [1.2 1]
+Fail	CSS Transitions with transition: all: property <scale> from neutral to [1.5 1] at (0.75) should be [1.4 1]
+Pass	CSS Transitions with transition: all: property <scale> from neutral to [1.5 1] at (1) should be [1.5 1]
+Fail	CSS Transitions with transition: all: property <scale> from neutral to [1.5 1] at (2) should be [1.9 1]
+Fail	CSS Animations: property <scale> from neutral to [1.5 1] at (-1) should be [0.7 1]
+Fail	CSS Animations: property <scale> from neutral to [1.5 1] at (0) should be [1.1 1]
+Fail	CSS Animations: property <scale> from neutral to [1.5 1] at (0.25) should be [1.2 1]
+Fail	CSS Animations: property <scale> from neutral to [1.5 1] at (0.75) should be [1.4 1]
+Pass	CSS Animations: property <scale> from neutral to [1.5 1] at (1) should be [1.5 1]
+Fail	CSS Animations: property <scale> from neutral to [1.5 1] at (2) should be [1.9 1]
+Fail	Web Animations: property <scale> from neutral to [1.5 1] at (-1) should be [0.7 1]
+Fail	Web Animations: property <scale> from neutral to [1.5 1] at (0) should be [1.1 1]
+Fail	Web Animations: property <scale> from neutral to [1.5 1] at (0.25) should be [1.2 1]
+Fail	Web Animations: property <scale> from neutral to [1.5 1] at (0.75) should be [1.4 1]
+Pass	Web Animations: property <scale> from neutral to [1.5 1] at (1) should be [1.5 1]
+Fail	Web Animations: property <scale> from neutral to [1.5 1] at (2) should be [1.9 1]
+Fail	CSS Transitions: property <scale> from [initial] to [2 0.5 1] at (-1) should be [0 1.5]
+Fail	CSS Transitions: property <scale> from [initial] to [2 0.5 1] at (0) should be [1]
+Fail	CSS Transitions: property <scale> from [initial] to [2 0.5 1] at (0.25) should be [1.25 0.875]
+Fail	CSS Transitions: property <scale> from [initial] to [2 0.5 1] at (0.75) should be [1.75 0.625]
+Fail	CSS Transitions: property <scale> from [initial] to [2 0.5 1] at (1) should be [2 0.5]
+Fail	CSS Transitions: property <scale> from [initial] to [2 0.5 1] at (2) should be [3 0]
+Fail	CSS Transitions with transition: all: property <scale> from [initial] to [2 0.5 1] at (-1) should be [0 1.5]
+Fail	CSS Transitions with transition: all: property <scale> from [initial] to [2 0.5 1] at (0) should be [1]
+Fail	CSS Transitions with transition: all: property <scale> from [initial] to [2 0.5 1] at (0.25) should be [1.25 0.875]
+Fail	CSS Transitions with transition: all: property <scale> from [initial] to [2 0.5 1] at (0.75) should be [1.75 0.625]
+Fail	CSS Transitions with transition: all: property <scale> from [initial] to [2 0.5 1] at (1) should be [2 0.5]
+Fail	CSS Transitions with transition: all: property <scale> from [initial] to [2 0.5 1] at (2) should be [3 0]
+Fail	CSS Animations: property <scale> from [initial] to [2 0.5 1] at (-1) should be [0 1.5]
+Fail	CSS Animations: property <scale> from [initial] to [2 0.5 1] at (0) should be [1]
+Fail	CSS Animations: property <scale> from [initial] to [2 0.5 1] at (0.25) should be [1.25 0.875]
+Fail	CSS Animations: property <scale> from [initial] to [2 0.5 1] at (0.75) should be [1.75 0.625]
+Fail	CSS Animations: property <scale> from [initial] to [2 0.5 1] at (1) should be [2 0.5]
+Fail	CSS Animations: property <scale> from [initial] to [2 0.5 1] at (2) should be [3 0]
+Fail	Web Animations: property <scale> from [initial] to [2 0.5 1] at (-1) should be [0 1.5]
+Fail	Web Animations: property <scale> from [initial] to [2 0.5 1] at (0) should be [1]
+Fail	Web Animations: property <scale> from [initial] to [2 0.5 1] at (0.25) should be [1.25 0.875]
+Fail	Web Animations: property <scale> from [initial] to [2 0.5 1] at (0.75) should be [1.75 0.625]
+Fail	Web Animations: property <scale> from [initial] to [2 0.5 1] at (1) should be [2 0.5]
+Fail	Web Animations: property <scale> from [initial] to [2 0.5 1] at (2) should be [3 0]
+Fail	CSS Transitions: property <scale> from [2 0.5 1] to [initial] at (-1) should be [3 0]
+Fail	CSS Transitions: property <scale> from [2 0.5 1] to [initial] at (0) should be [2 0.5]
+Fail	CSS Transitions: property <scale> from [2 0.5 1] to [initial] at (0.25) should be [1.75 0.6251]
+Fail	CSS Transitions: property <scale> from [2 0.5 1] to [initial] at (0.75) should be [1.25 0.875]
+Fail	CSS Transitions: property <scale> from [2 0.5 1] to [initial] at (1) should be [1]
+Fail	CSS Transitions: property <scale> from [2 0.5 1] to [initial] at (2) should be [0 1.5]
+Fail	CSS Transitions with transition: all: property <scale> from [2 0.5 1] to [initial] at (-1) should be [3 0]
+Fail	CSS Transitions with transition: all: property <scale> from [2 0.5 1] to [initial] at (0) should be [2 0.5]
+Fail	CSS Transitions with transition: all: property <scale> from [2 0.5 1] to [initial] at (0.25) should be [1.75 0.6251]
+Fail	CSS Transitions with transition: all: property <scale> from [2 0.5 1] to [initial] at (0.75) should be [1.25 0.875]
+Fail	CSS Transitions with transition: all: property <scale> from [2 0.5 1] to [initial] at (1) should be [1]
+Fail	CSS Transitions with transition: all: property <scale> from [2 0.5 1] to [initial] at (2) should be [0 1.5]
+Fail	CSS Animations: property <scale> from [2 0.5 1] to [initial] at (-1) should be [3 0]
+Fail	CSS Animations: property <scale> from [2 0.5 1] to [initial] at (0) should be [2 0.5]
+Fail	CSS Animations: property <scale> from [2 0.5 1] to [initial] at (0.25) should be [1.75 0.6251]
+Fail	CSS Animations: property <scale> from [2 0.5 1] to [initial] at (0.75) should be [1.25 0.875]
+Fail	CSS Animations: property <scale> from [2 0.5 1] to [initial] at (1) should be [1]
+Fail	CSS Animations: property <scale> from [2 0.5 1] to [initial] at (2) should be [0 1.5]
+Fail	Web Animations: property <scale> from [2 0.5 1] to [initial] at (-1) should be [3 0]
+Fail	Web Animations: property <scale> from [2 0.5 1] to [initial] at (0) should be [2 0.5]
+Fail	Web Animations: property <scale> from [2 0.5 1] to [initial] at (0.25) should be [1.75 0.6251]
+Fail	Web Animations: property <scale> from [2 0.5 1] to [initial] at (0.75) should be [1.25 0.875]
+Fail	Web Animations: property <scale> from [2 0.5 1] to [initial] at (1) should be [1]
+Fail	Web Animations: property <scale> from [2 0.5 1] to [initial] at (2) should be [0 1.5]
+Fail	CSS Transitions: property <scale> from [unset] to [1.5 1] at (-1) should be [0.5 1]
+Fail	CSS Transitions: property <scale> from [unset] to [1.5 1] at (0) should be [1]
+Fail	CSS Transitions: property <scale> from [unset] to [1.5 1] at (0.25) should be [1.125 1]
+Fail	CSS Transitions: property <scale> from [unset] to [1.5 1] at (0.75) should be [1.375 1]
+Pass	CSS Transitions: property <scale> from [unset] to [1.5 1] at (1) should be [1.5 1]
+Fail	CSS Transitions: property <scale> from [unset] to [1.5 1] at (2) should be [2 1]
+Fail	CSS Transitions with transition: all: property <scale> from [unset] to [1.5 1] at (-1) should be [0.5 1]
+Fail	CSS Transitions with transition: all: property <scale> from [unset] to [1.5 1] at (0) should be [1]
+Fail	CSS Transitions with transition: all: property <scale> from [unset] to [1.5 1] at (0.25) should be [1.125 1]
+Fail	CSS Transitions with transition: all: property <scale> from [unset] to [1.5 1] at (0.75) should be [1.375 1]
+Pass	CSS Transitions with transition: all: property <scale> from [unset] to [1.5 1] at (1) should be [1.5 1]
+Fail	CSS Transitions with transition: all: property <scale> from [unset] to [1.5 1] at (2) should be [2 1]
+Fail	CSS Animations: property <scale> from [unset] to [1.5 1] at (-1) should be [0.5 1]
+Fail	CSS Animations: property <scale> from [unset] to [1.5 1] at (0) should be [1]
+Fail	CSS Animations: property <scale> from [unset] to [1.5 1] at (0.25) should be [1.125 1]
+Fail	CSS Animations: property <scale> from [unset] to [1.5 1] at (0.75) should be [1.375 1]
+Pass	CSS Animations: property <scale> from [unset] to [1.5 1] at (1) should be [1.5 1]
+Fail	CSS Animations: property <scale> from [unset] to [1.5 1] at (2) should be [2 1]
+Fail	Web Animations: property <scale> from [unset] to [1.5 1] at (-1) should be [0.5 1]
+Fail	Web Animations: property <scale> from [unset] to [1.5 1] at (0) should be [1]
+Fail	Web Animations: property <scale> from [unset] to [1.5 1] at (0.25) should be [1.125 1]
+Fail	Web Animations: property <scale> from [unset] to [1.5 1] at (0.75) should be [1.375 1]
+Pass	Web Animations: property <scale> from [unset] to [1.5 1] at (1) should be [1.5 1]
+Fail	Web Animations: property <scale> from [unset] to [1.5 1] at (2) should be [2 1]
+Fail	CSS Transitions: property <scale> from [inherit] to [2 0.5 1] at (-1) should be [-1 1.5 3]
+Fail	CSS Transitions: property <scale> from [inherit] to [2 0.5 1] at (0) should be [0.5 1 2]
+Fail	CSS Transitions: property <scale> from [inherit] to [2 0.5 1] at (0.25) should be [0.875 0.875 1.75]
+Fail	CSS Transitions: property <scale> from [inherit] to [2 0.5 1] at (0.75) should be [1.625 0.625 1.25]
+Fail	CSS Transitions: property <scale> from [inherit] to [2 0.5 1] at (1) should be [2 0.5]
+Fail	CSS Transitions: property <scale> from [inherit] to [2 0.5 1] at (2) should be [3.5 0 0]
+Fail	CSS Transitions with transition: all: property <scale> from [inherit] to [2 0.5 1] at (-1) should be [-1 1.5 3]
+Fail	CSS Transitions with transition: all: property <scale> from [inherit] to [2 0.5 1] at (0) should be [0.5 1 2]
+Fail	CSS Transitions with transition: all: property <scale> from [inherit] to [2 0.5 1] at (0.25) should be [0.875 0.875 1.75]
+Fail	CSS Transitions with transition: all: property <scale> from [inherit] to [2 0.5 1] at (0.75) should be [1.625 0.625 1.25]
+Fail	CSS Transitions with transition: all: property <scale> from [inherit] to [2 0.5 1] at (1) should be [2 0.5]
+Fail	CSS Transitions with transition: all: property <scale> from [inherit] to [2 0.5 1] at (2) should be [3.5 0 0]
+Fail	CSS Animations: property <scale> from [inherit] to [2 0.5 1] at (-1) should be [-1 1.5 3]
+Fail	CSS Animations: property <scale> from [inherit] to [2 0.5 1] at (0) should be [0.5 1 2]
+Fail	CSS Animations: property <scale> from [inherit] to [2 0.5 1] at (0.25) should be [0.875 0.875 1.75]
+Fail	CSS Animations: property <scale> from [inherit] to [2 0.5 1] at (0.75) should be [1.625 0.625 1.25]
+Fail	CSS Animations: property <scale> from [inherit] to [2 0.5 1] at (1) should be [2 0.5]
+Fail	CSS Animations: property <scale> from [inherit] to [2 0.5 1] at (2) should be [3.5 0 0]
+Fail	Web Animations: property <scale> from [inherit] to [2 0.5 1] at (-1) should be [-1 1.5 3]
+Fail	Web Animations: property <scale> from [inherit] to [2 0.5 1] at (0) should be [0.5 1 2]
+Fail	Web Animations: property <scale> from [inherit] to [2 0.5 1] at (0.25) should be [0.875 0.875 1.75]
+Fail	Web Animations: property <scale> from [inherit] to [2 0.5 1] at (0.75) should be [1.625 0.625 1.25]
+Fail	Web Animations: property <scale> from [inherit] to [2 0.5 1] at (1) should be [2 0.5]
+Fail	Web Animations: property <scale> from [inherit] to [2 0.5 1] at (2) should be [3.5 0 0]
+Fail	CSS Transitions: property <scale> from [2 0.5 1] to [inherit] at (-1) should be [3.5 0 0]
+Fail	CSS Transitions: property <scale> from [2 0.5 1] to [inherit] at (0) should be [2 0.5]
+Fail	CSS Transitions: property <scale> from [2 0.5 1] to [inherit] at (0.25) should be [1.625 0.625 1.25]
+Fail	CSS Transitions: property <scale> from [2 0.5 1] to [inherit] at (0.75) should be [0.875 0.875 1.75]
+Fail	CSS Transitions: property <scale> from [2 0.5 1] to [inherit] at (1) should be [0.5 1 2]
+Fail	CSS Transitions: property <scale> from [2 0.5 1] to [inherit] at (2) should be [-1 1.5 3]
+Fail	CSS Transitions with transition: all: property <scale> from [2 0.5 1] to [inherit] at (-1) should be [3.5 0 0]
+Fail	CSS Transitions with transition: all: property <scale> from [2 0.5 1] to [inherit] at (0) should be [2 0.5]
+Fail	CSS Transitions with transition: all: property <scale> from [2 0.5 1] to [inherit] at (0.25) should be [1.625 0.625 1.25]
+Fail	CSS Transitions with transition: all: property <scale> from [2 0.5 1] to [inherit] at (0.75) should be [0.875 0.875 1.75]
+Fail	CSS Transitions with transition: all: property <scale> from [2 0.5 1] to [inherit] at (1) should be [0.5 1 2]
+Fail	CSS Transitions with transition: all: property <scale> from [2 0.5 1] to [inherit] at (2) should be [-1 1.5 3]
+Fail	CSS Animations: property <scale> from [2 0.5 1] to [inherit] at (-1) should be [3.5 0 0]
+Fail	CSS Animations: property <scale> from [2 0.5 1] to [inherit] at (0) should be [2 0.5]
+Fail	CSS Animations: property <scale> from [2 0.5 1] to [inherit] at (0.25) should be [1.625 0.625 1.25]
+Fail	CSS Animations: property <scale> from [2 0.5 1] to [inherit] at (0.75) should be [0.875 0.875 1.75]
+Fail	CSS Animations: property <scale> from [2 0.5 1] to [inherit] at (1) should be [0.5 1 2]
+Fail	CSS Animations: property <scale> from [2 0.5 1] to [inherit] at (2) should be [-1 1.5 3]
+Fail	Web Animations: property <scale> from [2 0.5 1] to [inherit] at (-1) should be [3.5 0 0]
+Fail	Web Animations: property <scale> from [2 0.5 1] to [inherit] at (0) should be [2 0.5]
+Fail	Web Animations: property <scale> from [2 0.5 1] to [inherit] at (0.25) should be [1.625 0.625 1.25]
+Fail	Web Animations: property <scale> from [2 0.5 1] to [inherit] at (0.75) should be [0.875 0.875 1.75]
+Fail	Web Animations: property <scale> from [2 0.5 1] to [inherit] at (1) should be [0.5 1 2]
+Fail	Web Animations: property <scale> from [2 0.5 1] to [inherit] at (2) should be [-1 1.5 3]
+Fail	CSS Transitions: property <scale> from [initial] to [inherit] at (-1) should be [1.5 1 0]
+Fail	CSS Transitions: property <scale> from [initial] to [inherit] at (0) should be [1]
+Fail	CSS Transitions: property <scale> from [initial] to [inherit] at (0.25) should be [0.875 1 1.25]
+Fail	CSS Transitions: property <scale> from [initial] to [inherit] at (0.75) should be [0.625 1 1.75]
+Fail	CSS Transitions: property <scale> from [initial] to [inherit] at (1) should be [0.5 1 2]
+Fail	CSS Transitions: property <scale> from [initial] to [inherit] at (2) should be [0 1 3]
+Fail	CSS Transitions with transition: all: property <scale> from [initial] to [inherit] at (-1) should be [1.5 1 0]
+Fail	CSS Transitions with transition: all: property <scale> from [initial] to [inherit] at (0) should be [1]
+Fail	CSS Transitions with transition: all: property <scale> from [initial] to [inherit] at (0.25) should be [0.875 1 1.25]
+Fail	CSS Transitions with transition: all: property <scale> from [initial] to [inherit] at (0.75) should be [0.625 1 1.75]
+Fail	CSS Transitions with transition: all: property <scale> from [initial] to [inherit] at (1) should be [0.5 1 2]
+Fail	CSS Transitions with transition: all: property <scale> from [initial] to [inherit] at (2) should be [0 1 3]
+Fail	CSS Animations: property <scale> from [initial] to [inherit] at (-1) should be [1.5 1 0]
+Fail	CSS Animations: property <scale> from [initial] to [inherit] at (0) should be [1]
+Fail	CSS Animations: property <scale> from [initial] to [inherit] at (0.25) should be [0.875 1 1.25]
+Fail	CSS Animations: property <scale> from [initial] to [inherit] at (0.75) should be [0.625 1 1.75]
+Fail	CSS Animations: property <scale> from [initial] to [inherit] at (1) should be [0.5 1 2]
+Fail	CSS Animations: property <scale> from [initial] to [inherit] at (2) should be [0 1 3]
+Fail	Web Animations: property <scale> from [initial] to [inherit] at (-1) should be [1.5 1 0]
+Fail	Web Animations: property <scale> from [initial] to [inherit] at (0) should be [1]
+Fail	Web Animations: property <scale> from [initial] to [inherit] at (0.25) should be [0.875 1 1.25]
+Fail	Web Animations: property <scale> from [initial] to [inherit] at (0.75) should be [0.625 1 1.75]
+Fail	Web Animations: property <scale> from [initial] to [inherit] at (1) should be [0.5 1 2]
+Fail	Web Animations: property <scale> from [initial] to [inherit] at (2) should be [0 1 3]
+Fail	CSS Transitions: property <scale> from [inherit] to [initial] at (-1) should be [0 1 3]
+Fail	CSS Transitions: property <scale> from [inherit] to [initial] at (0) should be [0.5 1 2]
+Fail	CSS Transitions: property <scale> from [inherit] to [initial] at (0.25) should be [0.625 1 1.75]
+Fail	CSS Transitions: property <scale> from [inherit] to [initial] at (0.75) should be [0.875 1 1.25]
+Fail	CSS Transitions: property <scale> from [inherit] to [initial] at (1) should be [1]
+Fail	CSS Transitions: property <scale> from [inherit] to [initial] at (2) should be [1.5 1 0]
+Fail	CSS Transitions with transition: all: property <scale> from [inherit] to [initial] at (-1) should be [0 1 3]
+Fail	CSS Transitions with transition: all: property <scale> from [inherit] to [initial] at (0) should be [0.5 1 2]
+Fail	CSS Transitions with transition: all: property <scale> from [inherit] to [initial] at (0.25) should be [0.625 1 1.75]
+Fail	CSS Transitions with transition: all: property <scale> from [inherit] to [initial] at (0.75) should be [0.875 1 1.25]
+Fail	CSS Transitions with transition: all: property <scale> from [inherit] to [initial] at (1) should be [1]
+Fail	CSS Transitions with transition: all: property <scale> from [inherit] to [initial] at (2) should be [1.5 1 0]
+Fail	CSS Animations: property <scale> from [inherit] to [initial] at (-1) should be [0 1 3]
+Fail	CSS Animations: property <scale> from [inherit] to [initial] at (0) should be [0.5 1 2]
+Fail	CSS Animations: property <scale> from [inherit] to [initial] at (0.25) should be [0.625 1 1.75]
+Fail	CSS Animations: property <scale> from [inherit] to [initial] at (0.75) should be [0.875 1 1.25]
+Fail	CSS Animations: property <scale> from [inherit] to [initial] at (1) should be [1]
+Fail	CSS Animations: property <scale> from [inherit] to [initial] at (2) should be [1.5 1 0]
+Fail	Web Animations: property <scale> from [inherit] to [initial] at (-1) should be [0 1 3]
+Fail	Web Animations: property <scale> from [inherit] to [initial] at (0) should be [0.5 1 2]
+Fail	Web Animations: property <scale> from [inherit] to [initial] at (0.25) should be [0.625 1 1.75]
+Fail	Web Animations: property <scale> from [inherit] to [initial] at (0.75) should be [0.875 1 1.25]
+Fail	Web Animations: property <scale> from [inherit] to [initial] at (1) should be [1]
+Fail	Web Animations: property <scale> from [inherit] to [initial] at (2) should be [1.5 1 0]
\ No newline at end of file
diff --git a/Tests/LibWeb/Text/input/wpt-import/css/css-transforms/animation/scale-interpolation.html b/Tests/LibWeb/Text/input/wpt-import/css/css-transforms/animation/scale-interpolation.html
new file mode 100644
index 00000000000..f23109318f4
--- /dev/null
+++ b/Tests/LibWeb/Text/input/wpt-import/css/css-transforms/animation/scale-interpolation.html
@@ -0,0 +1,242 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>scale interpolation</title>
+    <link rel="help" href="https://drafts.csswg.org/css-transforms-2/#propdef-scale">
+    <meta name="assert" content="scale supports animation.">
+    <script src="../../../resources/testharness.js"></script>
+    <script src="../../../resources/testharnessreport.js"></script>
+    <script src="../../../css/support/interpolation-testcommon.js"></script>
+    <style>
+    .parent {
+      scale: 0.5 1 2
+    }
+    .target {
+      width: 10px;
+      height: 10px;
+      background-color: black;
+      scale: 1.1 1;
+    }
+    .expected {
+      background-color: green;
+    }
+    </style>
+  </head>
+  <body>
+    <template id="target-template">
+      <div class="parent">
+        <div class="target"></div>
+      </div>
+    </template>
+
+    <script>
+      // Matching two <number> version.
+      test_interpolation({
+        property: 'scale',
+        from: '-10 5',
+        to: '10 -5',
+      }, [
+        {at: -1, expect: '-30 15'},
+        {at: 0, expect: '-10 5'},
+        {at: 0.25, expect: '-5 2.5'},
+        {at: 0.75, expect: '5 -2.5'},
+        {at: 1, expect: '10 -5'},
+        {at: 2, expect: '30 -15'},
+      ]);
+
+      // Matching three <number> version.
+      test_interpolation({
+        property: 'scale',
+        from: '2 30 400',
+        to: '10 110 1200',
+      }, [
+        {at: -1, expect: '-6 -50 -400'},
+        {at: 0, expect: '2 30 400'},
+        {at: 0.125, expect: '3 40 500'},
+        {at: 0.875, expect: '9 100 1100'},
+        {at: 1, expect: '10 110 1200'},
+        {at: 2, expect: '18 190 2000'}
+      ]);
+
+      // From three <number> to two <number>; test that it expands correctly.
+      test_interpolation({
+        property: 'scale',
+        from: '26 17 9',
+        to: '2 1',
+      }, [
+        {at: -1, expect: '50 33 17'},
+        {at: 0, expect: '26 17 9'},
+        {at: 0.125, expect: '23 15 8'},
+        {at: 0.875, expect: '5 3 2'},
+        {at: 1, expect: '2 1'},
+        {at: 2, expect: '-22 -15 -7'}
+      ]);
+
+      // Test one <number> is expanded correctly.
+      test_interpolation({
+        property: 'scale',
+        from: '1',
+        to: '10 -5 0',
+      }, [
+        {at: -1, expect: '-8 7 2'},
+        {at: 0, expect: '1'},
+        {at: 0.25, expect: '3.25 -0.5 0.75'},
+        {at: 0.75, expect: '7.75 -3.5 0.25'},
+        {at: 1, expect: '10 -5 0'},
+        {at: 2, expect: '19 -11 -1'},
+      ]);
+
+      test_interpolation({
+        property: 'scale',
+        from: '-10 5 1',
+        to: '1',
+      }, [
+        {at: -1, expect: '-21 9'},
+        {at: 0, expect: '-10 5'},
+        {at: 0.25, expect: '-7.25 4'},
+        {at: 0.75, expect: '-1.75 2'},
+        {at: 1, expect: '1'},
+        {at: 2, expect: '12 -3'},
+      ]);
+
+      // Handling of the none value.
+      test_interpolation({
+        property: 'scale',
+        from: 'none',
+        to: 'none',
+      }, [
+        {at: -1, expect: 'none'},
+        {at: 0, expect: 'none'},
+        {at: 0.125, expect: 'none'},
+        {at: 0.875, expect: 'none'},
+        {at: 1, expect: 'none'},
+        {at: 2, expect: 'none'}
+      ]);
+
+      // Going from none to a valid value; test that it converts properly.
+      test_interpolation({
+        property: 'scale',
+        from: 'none',
+        to: '4 3 2',
+      }, [
+        {at: -1, expect: '-2 -1 0'},
+        {at: 0, expect: '1'},
+        {at: 0.125, expect: '1.375 1.25 1.125'},
+        {at: 0.875, expect: '3.625 2.75 1.875'},
+        {at: 1, expect: '4 3 2'},
+        {at: 2, expect: '7 5 3'}
+      ]);
+
+      // Test neutral keyframe; make sure it adds the underlying.
+      test_interpolation({
+        property: 'scale',
+        from: neutralKeyframe,
+        to: '1.5 1',
+      }, [
+        {at: -1, expect: '0.7 1'},
+        {at: 0, expect: '1.1 1'},
+        {at: 0.25, expect: '1.2 1'},
+        {at: 0.75, expect: '1.4 1'},
+        {at: 1, expect: '1.5 1'},
+        {at: 2, expect: '1.9 1'},
+      ]);
+
+      // Test initial value; for 'scale' this is 'none'.
+      test_interpolation({
+        property: 'scale',
+        from: 'initial',
+        to: '2 0.5 1',
+      }, [
+        {at: -1, expect: '0 1.5'},
+        {at: 0, expect: '1'},
+        {at: 0.25, expect: '1.25 0.875'},
+        {at: 0.75, expect: '1.75 0.625'},
+        {at: 1, expect: '2 0.5'},
+        {at: 2, expect: '3 0'},
+      ]);
+
+      test_interpolation({
+        property: 'scale',
+        from: '2 0.5 1',
+        to: 'initial',
+      }, [
+        {at: -1, expect: '3 0'},
+        {at: 0, expect: '2 0.5'},
+        {at: 0.25, expect: '1.75 0.6251'},
+        {at: 0.75, expect: '1.25 0.875'},
+        {at: 1, expect: '1'},
+        {at: 2, expect: '0 1.5'},
+      ]);
+
+
+      // Test unset value; for 'scale' this is 'none'.
+      test_interpolation({
+        property: 'scale',
+        from: 'unset',
+        to: '1.5 1',
+      }, [
+        {at: -1, expect: '0.5 1'},
+        {at: 0, expect: '1'},
+        {at: 0.25, expect: '1.125 1'},
+        {at: 0.75, expect: '1.375 1'},
+        {at: 1, expect: '1.5 1'},
+        {at: 2, expect: '2 1'},
+      ]);
+
+      // Test inherited value.
+      test_interpolation({
+        property: 'scale',
+        from: 'inherit',
+        to: '2 0.5 1',
+      }, [
+        {at: -1, expect: '-1 1.5 3'},
+        {at: 0, expect: '0.5 1 2'},
+        {at: 0.25, expect: '0.875 0.875 1.75'},
+        {at: 0.75, expect: '1.625 0.625 1.25'},
+        {at: 1, expect: '2 0.5'},
+        {at: 2, expect: '3.5 0 0'},
+      ]);
+
+      test_interpolation({
+        property: 'scale',
+        from: '2 0.5 1',
+        to: 'inherit',
+      }, [
+        {at: -1, expect: '3.5 0 0'},
+        {at: 0, expect: '2 0.5'},
+        {at: 0.25, expect: '1.625 0.625 1.25'},
+        {at: 0.75, expect: '0.875 0.875 1.75'},
+        {at: 1, expect: '0.5 1 2'},
+        {at: 2, expect: '-1 1.5 3'},
+      ]);
+
+      // Test combination of initial and inherit.
+      test_interpolation({
+        property: 'scale',
+        from: 'initial',
+        to: 'inherit',
+      }, [
+        {at: -1, expect: '1.5 1 0'},
+        {at: 0, expect: '1'},
+        {at: 0.25, expect: '0.875 1 1.25'},
+        {at: 0.75, expect: '0.625 1 1.75'},
+        {at: 1, expect: '0.5 1 2'},
+        {at: 2, expect: '0 1 3'},
+      ]);
+
+      test_interpolation({
+        property: 'scale',
+        from: 'inherit',
+        to: 'initial',
+      }, [
+        {at: -1, expect: '0 1 3'},
+        {at: 0, expect: '0.5 1 2'},
+        {at: 0.25, expect: '0.625 1 1.75'},
+        {at: 0.75, expect: '0.875 1 1.25'},
+        {at: 1, expect: '1'},
+        {at: 2, expect: '1.5 1 0'},
+      ]);
+    </script>
+  </body>
+</html>